execution: FCU background-commit worker + generation-chain reader consistency - #21414
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mh0lt wants to merge 186 commits into
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execution: FCU background-commit worker + generation-chain reader consistency#21414mh0lt wants to merge 186 commits into
mh0lt wants to merge 186 commits into
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Pure refactor — behavior preserved. Splits the encoded-branch→cells decode logic out of HexPatriciaHashed.unfoldBranchNode into a free function DecodeBranchInto so the same code is consumed by: - unfoldBranchNode (existing trie unfold path) - future cache populators (decoded-payload BranchCache) - future parallel pre-unfold orchestrator (Stage E) Today these would each have to re-derive the encoded-branch parsing logic. Centralising it ensures one decoder, one set of edge cases, one place to fix any bug in the on-disk format handling. DecodeBranchInto is intentionally PURE — it does not call deriveHashedKeys. Trie callers (which need hashed keys for the fold state machine) follow the decode with their own keccak loop. Cache callers can skip the derive step entirely until the cell is consumed by the trie. Tests: - TestDecodeBranchInto_RoundTrip: BranchEncoder.EncodeBranch produces bytes that DecodeBranchInto recovers cell-for-cell. Property test that keeps the canonical decoder consistent with the canonical encoder. - TestDecodeBranchInto_DeletedFlag: touchMap/afterMap convention with the deleted parameter. - TestDecodeBranchInto_TruncatedInput: clean errors on truncated input (no panic). Plus the existing commitment test suite (incl. trie-mismatch tests in TestBranchData_*) all pass without modification, confirming the refactor preserves unfoldBranchNode's behavior. This is the foundation for the next refactors in the representation-reduction track (see agentspecs/trie-data-pipeline-complexity-tax.md): subsequent PRs will introduce a decoded-payload cache that reads through this same decoder, and will lift unfoldKeyPath as a per-key traversal primitive that the warmer + future Stage E both consume. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduces a new BranchCache type, distinct from WarmupCache and
designed for the longer-lived caching the cross-block persistence
work needs (step 7 of the representation-reduction sequence).
Distinguishing characteristics vs WarmupCache:
- Bounded LRU tail with configurable capacity (vs WarmupCache's
unbounded map). Suitable for caches that outlive a single Process
without unbounded memory growth.
- Single pinned slot for the root branch (compact prefix [0x00]).
Root never evicts. Atomic-pointer load/store on the hot read
path, no lock involved.
- dirty-flag + PutIfClean invariants — same semantics as the
invariants added to WarmupCache in the previous commit. Lets
cross-block writers race safely with fold updates.
- Lazy GetDecoded — same lazy-decode pattern as WarmupCache's
GetBranchDecoded; cells populated on first decoded-read and
cached for subsequent reads.
NOT yet wired into the trie's read or write paths. This commit just
adds the type, with tests. The trie integration (where this cache
plugs into branchFromCacheOrDB and the encoder's PutBranch) is the
discussion point at the step 6 boundary — see the conversation
captured at this point in the representation-reduction sequence.
Today the cache is intended to be ephemeral (per-Process,
constructed alongside the trie, dies with it). Step 7 lifts the
lifetime to the aggTx level for cross-block persistence; the cache
shape (bounded LRU + pinned root + dirty-flag) is in place ahead
of that.
Tests:
- TestBranchCache_RootPinning: root branch lands in pinned slot,
deep branches land in LRU tail; per-tier hit counters update
independently.
- TestBranchCache_RootSurvivesEvictionPressure: root persists when
tail is overfilled past capacity.
- TestBranchCache_DirtyFlag: PutIfClean refuses dirty entry,
unconditional Put replaces and clears dirty.
- TestBranchCache_GetDecoded: lazy-decode round-trip with
BranchEncoder; cells pointer reused across reads.
- TestBranchCache_Invalidate: removes from both tiers.
- TestBranchCache_Clear: empties both tiers, resets stats.
- TestBranchCache_Stats: deterministic format with per-tier counts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Doc-only addition to BranchCache's package-level comment, capturing
the caller invariants the cache assumes and the conditions under
which the existing concurrent trie satisfies them.
Three caller invariants:
1. Single writer per prefix at any moment.
2. Mark-dirty-then-Put discipline for racing writers.
3. Decoded cells from GetDecoded are read-only (alias entry storage).
The current ConcurrentPatriciaHashed satisfies all three by
construction:
- Mounts partition by first nibble (disjoint prefix spaces, no
cross-mount writes to the same key).
- Root branch written by single sequential fold post-Wait.
- Mount→root grid roll-up is rootMu-protected (in-memory grid
only, separate from cache writes).
Doc explicitly flags that any future parallel fold redesign (Stage F
in agentspecs/stage-e-pre-unfold-design.md) MUST preserve these
invariants — particularly the single-writer-per-prefix one, which
breaks if parent branches are written incrementally as children
complete in parallel. The required coordination layer goes at the
orchestrator (per-parent atomic counter; only the last-decrementer
writes the parent), NOT inside the cache. The cache's existing
primitives (atomic dirty flag, thread-safe LRU, atomic root pointer)
are sufficient for that orchestrator to build on.
Motivation: Stage F is likely deferred because the bench data shows
fold isn't the bottleneck for the canonical SSTORE-bloat workload.
But adding the constraint to the cache later (after caching is in
production) is much harder than documenting it now — correctness
regressions from a missed coordination layer can hide for many
blocks. Documenting the contract on the cache itself ensures any
engineer touching parallel fold sees it.
No code change. Doc-only. All tests still pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Step 7a of the representation-reduction sequence: per-Process
integration of the BranchCache type added in the previous commit.
Plumbing:
- Trie interface gains SetBranchCache(*BranchCache).
HexPatriciaHashed implementation propagates to its branchEncoder.
ConcurrentPatriciaHashed implementation propagates the SAME
instance to root + all 16 mounts (sharing one cache is correct
under the concurrency contract — mounts partition prefix space
by first nibble, so cross-mount writes target distinct keys).
- InitializeTrieAndUpdates constructs a new BranchCache(default)
per trie instance and attaches it. Lifetime today = trie
lifetime = per-Process. Future cross-block persistence work
(step 7b) lifts this to aggTx scope by constructing the cache
one layer up and passing it in.
Read path (HPH.branchFromCacheOrDB):
L1 WarmupCache (existing) → L2 BranchCache (new) → L3 ctx.Branch.
L3 hits with non-empty result populate L2 so subsequent reads hit
L2 within the cache's lifetime. L1 stays first because warmup
workers may have pre-fetched with prefix-walk-derived freshness.
Write path (BranchEncoder.CollectUpdate):
- MarkDirty(prefix) BEFORE encode work — protects against
concurrent warmup-style writers racing into PutIfClean during
the encode (race documented in the cache's Concurrency Contract).
- Put(prefixCopy, updateCopy) AFTER ctx.PutBranch succeeds —
replaces the dirty entry with fresh canonical bytes. Single
writer per prefix per fold step (current sequential fold +
first-nibble mount partitioning) means no race on this Put.
Lifecycle:
HPH.Reset clears the BranchCache when called from the root trie
(gated by !hph.mounted). Mounted subtries share the root's cache,
so a mount calling Clear would dump entries the root still wants.
Carries the invariant from PR #19954 commit 1612d56.
Today's expected performance impact: minimal. Per-Process lifetime
means cache is empty at Process start, so first reads always miss.
The cache helps only branches that are read multiple times within
ONE Process — uncommon in current code paths. Step 7b is where
the real perf swing comes from (cross-block persistence so block
N reads hit branches written by block N-1).
This commit is the safe stepping stone: it validates the wire-up
end-to-end (read path + write path + concurrency contract +
lifecycle) without changing perf characteristics. Bench should
match Run I baseline (7.16 mgas/s on canonical SSTORE-bloat block).
All commitment tests pass, lint clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Previously the BranchCache was constructed inside InitializeTrieAndUpdates, giving it per-SharedDomains lifetime. SharedDomains is reconstructed for every batch / many tx boundaries — verified with logs in the prototype (921 fresh BranchCache constructions per bench run) — so the cache started cold every batch and never delivered the cross-block hits the design is about. Per-Process scope kept cache-cleanup correctness simple but defeated the whole point of caching. Place the cache on the commitment Domain struct (one cache per aggregator, matching the pattern on add_execution_context_with_caches where each domain owns its valueCache). ConfigureDomains attaches the cache once after domains are initialised — idempotent, lifetime = aggregator lifetime. AggregatorRoTx exposes BranchCache() returning the commitment domain's cache, so SharedDomains' construction path can fetch it without forcing db/state/execctx to import db/state (db/state already imports execctx via squeeze.go, so the reverse import would create a cycle). The placeholder commitment.BranchCacheProvider interface lets the SD construction path use a duck-typed type assertion on tx.AggTx() any. Plumb the cache through NewSharedDomainsCommitmentContext into InitializeTrieAndUpdates as an explicit parameter; nil falls back to a fresh per-init cache so test helpers without an aggregator still get a valid cache. Reset behaviour: HexPatriciaHashed.Reset no longer calls Clear on the cache. Aggregator-scope persistence requires the cache to survive Reset between commitment calculations. Callers that genuinely need to invalidate the cache (unwind, fork validation) now call ClearBranchCache explicitly. The bench is forward-only so this is a safe change for measurement; an explicit unwind clear path can land in a follow-up commit when needed.
Adds two debug-gated diagnostics for cross-block-cache-lifetime
investigations. Both off by default — meant to be flipped on when a
correctness regression surfaces and you need to localise *where in the
fold path* the cache started lying, instead of waiting for a downstream
trie-root-mismatch many blocks later.
1. BRANCH_CACHE_VERIFY: branchFromCacheOrDB cross-checks every L2
(BranchCache) hit against ctx.Branch and increments a divergence
counter when bytes disagree. Logs the prefix and both byte forms so
the first divergent read shows up directly in the erigon log.
BranchCache.VerifyDivergences() exposes the count for assertion in
tests.
2. BRANCH_CACHE_FINGERPRINT: SharedDomainsCommitmentContext.ComputeCommitment
emits a "[cache-fp]" log at end of every compute with (block, root,
cache fingerprint, divergence count). Two builds running the same
workload can be diffed offline ("first block at which their fp's
differ") to nail down the first block where lifecycle invariants
diverged. Fingerprint is an order-independent FNV-1a fold over
(key-hash, data-hash) pairs across both root and tail tiers.
Adds maphash.LRU.Range so the Fingerprint can iterate the LRU tail
without touching recency (Peek under the hood). The wrapper otherwise
discards original byte-keys on insert; mixing by hash instead of key is
correctness-equivalent up to hash collision, which is acceptable at the
working-set sizes here.
Motivation: today we just chased a wrong-root regression to commit
d673052 (aggregator-scope cache lifetime). Took two full bench cycles
(~12 min) to localise. With the divergence detector running, the first
divergent read would surface in the erigon log within seconds. With
fingerprint logging in two builds (one good, one regressed), the
diverging block boundary would be a single grep across two log files.
The deferred-encoding path (CollectDeferredUpdate + ApplyDeferredUpdates)
parallelises EncodeBranch + merge work at apply time. The cache
correctness consequence: between collect and apply, sd.mem holds the
old state while the cache is also unchanged. When apply finally fires
(end of Process or duplicate-prefix flush mid-Process), sd.mem
advances but the cache isn't touched — CollectDeferredUpdate doesn't
have a cache hook (and wiring one breaks
TestSharedDomain_RepeatedUnwindAcrossStepBoundary +
TestCustomTraceReceiptDomain because it violates an implicit
trie-during-Process cache stability invariant).
The result on the FV bench: cache stays at the very-first-Process's
read-side L3 fallback bytes for prefixes the trie writes, while
ctx.Branch advances to each block's actual state. Divergence on every
hot prefix (root, root-zone children) starting from block 2.
Use CollectUpdate (inline) instead. CollectUpdate writes
sd.mem + WarmupCache + BranchCache atomically at fold time via
PutBranch — cache mirrors sd.mem at every write, the trie sees its own
writes consistently, and the cross-Process cache state matches what
post-FCU MDBX commit produced. Loses the encoder's parallel-encoding
optimisation, but bench profile is I/O-bound, not encode-CPU-bound, so
the trade is favourable.
History (ETL) writes are still inline via DomainPut. Splitting that
("sd.mem inline, history queued for flush at FCU") is the proper
architectural answer to defer the slow disk work without touching the
sd.mem invariant — tracked as a follow-up.
Bisection helper: force branchFromCacheOrDB to skip the L2 BranchCache read path entirely so every read goes via ctx.Branch (sd.mem → MDBX). Cache writes still fire so verify-mode can keep comparing cache vs canonical. Flipping the env at runtime distinguishes "cache holds bad data" (bench passes further with cache reads off) from "deeper compute bug" (same failure regardless). Used in the 2026-05-06 investigation to confirm the cache was actively corrupting block 13's compute on the canonical SSTORE-bloat bench: with cache reads on, wrong-trie-root at block 13. With reads off, blocks 13-16 produce the correct roots and the bench advances to a separate failure at block 17 (unrelated pre-existing bug). Default off; gate via env DISABLE_BRANCH_CACHE_READS=true.
When verifyBranchCache=true and a cache hit disagrees with ctx.Branch, sample sd.mem, sd.parent.mem, and tx-direct (MDBX) for the same prefix and dump all layers in the divergence log line. Comparing those four byte sequences against the cached and canonical bytes pinpoints which state layer holds the bytes the cache disagrees with — the rewriter we need to identify before fixing the canonical-store-divergence bugs the cache currently exposes. Decision matrix (read off the log line): - cache != tx, sd.mem == cache → in-memory writer is fresh, MDBX is stale (commit-timing issue). - cache != tx, tx == ctx.Branch, sd.mem != cache, parent.mem != cache → MDBX has been rewritten by something outside the CollectUpdate write path (collation, file build, squeeze). - cache != ctx.Branch, parent.mem matches ctx.Branch but sd.mem doesn't → parent merge is the source. - cache != ctx.Branch, all of sd.mem / parent.mem / tx == ctx.Branch → cache itself was populated incorrectly (write-side bug). Three changes: 1. SharedDomains.ProbeReadLayers (db/state/execctx/domain_shared.go): public method that samples sd.mem, sd.parent.mem (private field accessed from the same package), and tx.GetLatest. Read-only; copies bytes so callers can hold them past tx lifetime. 2. TrieContext (execution/commitment/commitmentdb/commitment_context.go): add probeSd + probeTx fields populated at trieContext() construction; expose ProbeStateLayers method that delegates to sd.ProbeReadLayers. The local `sd` interface gets the ProbeReadLayers method too so the duck-typed reference can call it without an import cycle to execctx. 3. branchFromCacheOrDB log site (execution/commitment/hex_patricia_hashed.go): on divergence with verifyBranchCache, type-assert ctx for the probe interface and append sd_mem / parent_mem / mdbx fields to the log line. Existing field shape preserved for log parsers; new fields are additive. Pre-existing test failures (TestSharedDomain_RepeatedUnwindAcrossStepBoundary, TestValidateChainAndUpdateForkChoiceWithSideForksThatGoBackAndForwardInHeight) are unchanged — they were failing on the stack before this probe landed and are part of what the divergence work is meant to localise.
Per-write provenance for divergence-detection diagnostics. When a
divergence fires (cache hit disagrees with ctx.Branch), we now log
which write site produced the cached bytes and when, so we can
correlate the bad write against the FCU / build / step timeline.
Tag fields added to branchCacheEntry:
- origin short label of the write site (e.g. "CollectUpdate",
"L3-fallback-read")
- writeSeq monotonic counter per BranchCache instance
- writeTimeNanos unix nanos at write time
Put / PutIfClean signatures take an origin string. Two writers
updated:
- BranchEncoder.CollectUpdate → "CollectUpdate"
- branchFromCacheOrDB L3-fallback Put → "L3-fallback-read"
GetWithOrigin returns bytes plus the metadata; uses a non-counting
peek so it can be called alongside Get without double-counting hits.
The divergence-detection log site at branchFromCacheOrDB now appends
cache_origin / cache_seq / cache_t_ns fields. Combine with the
existing sd_mem / parent_mem / mdbx fields to localise both who wrote
the stale bytes and which layer the canonical value lives in.
Pre-existing test failures
(TestValidateChainAndUpdateForkChoiceWithSideForksThatGoBackAndForwardInHeight)
are unchanged from previous commits.
BranchCache previously sat in front of the sd.mem -> parent.mem -> MDBX
read chain (consulted in branchFromCacheOrDB before ctx.Branch). The
shared aggregator-scope cache was written from CollectUpdate by every
SD running commitment compute, including fork-validator SDs whose
writes never reach MDBX. Origin-tagged probe (run-step7b-probe-sdid)
showed five distinct SD pointers writing the same prefix to a single
cache entry, so any reader whose lineage didn't match the most-recent
writer saw bytes that disagreed with MDBX -> wrong trie root from
block 13 onward in the canonical SSTORE-bloat fork bench.
Layering after this change:
Read: sd.mem -> sd.parent.mem -> branchCache -> aggTx (MDBX)
Write: sd.mem only (DomainPut path)
Flush: sd.mem -> MDBX, then branchCache.Clear()
The cache now mirrors MDBX-flushed bytes only. Writers' in-flight bytes
live in sd.mem above; cache hits below sd.mem are always equivalent to
reading MDBX, so cross-SD pollution is impossible by construction.
Cache fills lazily on the MDBX-read path inside sd.GetLatest, and
clear-on-flush prevents pre-flush bytes from coexisting with new MDBX
state. Per-key invalidation is a follow-up (PR2).
BranchCache entries gain a step field so Get returns (data, step, ok)
matching the aggTx contract. Without this, sd.GetLatest's cache hit
returned step=0 and CheckDataAvailable rejected the boot SeekCommitment
with "commitment state out of date".
Removed:
- cache.Put from CollectUpdate (commitment.go)
- cache.Put + divergence detection from branchFromCacheOrDB
(hex_patricia_hashed.go); now just calls ctx.Branch
- L3-fallback Put (cache fills via sd.GetLatest now)
Validated on canonical cold bench (run-step8b): first FCU VALID, all
payloads through end VALID, 0 cache divergences, 0 wrong-root errors.
Prior probe bench had 23 divergences and INVALID payloads from the
fail block onward.
Probe scaffolding (SiteIdentity, ProbeStateLayers, divergence counters)
left in place for now; can be stripped in a cleanup follow-up.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…ache state Update the BranchCache type comment to reflect the architectural state after the WarmupCache consolidation (steps 2a-2c, 3, 4): - BranchCache is the single branch cache (WarmupCache deleted) - Aggregator-scope lifetime, plumbed via BranchCacheProvider - Passive store: cache itself never reaches into underlying state - Branch warmer is branch-scoped; no leaf-data prefetch - Block-processing trie walker takes Updates from executor + memoization for siblings — no prefetch needed - Witness / proof generation walker drives its own state reads; if that path turns out to be cold-bound it indicates a need for separate account/storage caches (treat as separate concern with different scope/lifetime/invalidation; do not regrow the branch warmer to cover it) - disk_sto / disk_acc counters on cache-fp log surface any unexpected fall-through to ctx.Account / ctx.Storage as a signal of memoization gap or missing walker-side prefetch Doc-only; no behaviour change.
Adds a third cache tier between the root-pin slot and the LRU tail: a per-prefix pinned map fed by PinEntry. Pinned entries: - Never evict (no LRU pressure on this tier). - Are checked in lookup before the LRU tail, after the root slot. - Survive Put/SD.Flush updates: a Put for a pinned prefix updates the pinned entry in place rather than displacing it. Cross-block correctness via the existing dirty-flag invalidation discipline is preserved — the new bytes land in the same pinned slot. - Carry the same metadata as Put-tier entries (step, origin, writeSeq, writeTimeNanos) so divergence-detection and Stats treat them uniformly. Sized by the preload policy. Intended consumer is the storage trunk preload for big contracts (the 'storage root trunk cache for big accounts' direction): per-contract trunk branches at depth 65-70 get pinned at SD/cache creation, persist for the cache's lifetime. PinEntry is the public API; pinnedHits/pinnedMisses atomic counters are the new stats. PinnedCount() exposes current size for observability. Step 2 of the storage-trunk pin prototype.
Adds a function to pre-pin commitment branches for a given contract's storage subtree. Walks the trie depth-by-depth from depth 64 (storage subtree root) down to maxDepth: reads each branch via the supplied CommitmentReader, pins it via BranchCache.PinEntry, decodes the child bitmap, and recurses only into children that actually exist (no blind 16-way probing). contractHash is keccak256(address); the trunk lives at the prefix corresponding to the first 64 nibbles of the storage path. For a dense storage subtree (the SSTORE-bloat workload's bloat contract), expected pin count is ~16 + 256 + 4096 ≈ 4.4 K branches at depth 65/66/67, plus the root at depth 64. Sparse subtrees produce fewer. Loading strategy: per-prefix lookups via the reader. Simplest correct implementation. A bulk seg.Getter range-scan over sorted .kv would amortize disk seeks (per the parity-cluster observation in the consolidation memo) but requires building a prefix-range API on top of recsplit; defer until per-prefix lookup is shown to bottleneck. Step 3 of the storage-trunk pin prototype.
Adds a SharedDomains constructor hook that, when PIN_CONTRACT_TRUNKS is set, fires a one-shot background goroutine to preload the storage-subtree-trunk of each listed contract into BranchCache's pinned tier. Format: comma-separated list of 64-hex-char contract hashes (each is keccak256(addr)). Mechanism: - BranchCache.TryClaimPreload (atomic CAS) ensures the goroutine fires exactly once per cache lifetime, even though many SDs may be constructed (per-tx instances etc.). - Goroutine wraps sd.GetLatest as a CommitmentReader and calls commitment.PreloadContractTrunk for each contract hash, depth 64-70. - Logs progress per contract on completion. Closure-over-(sd, tx) is the prototype shape — works for the bench (both live for the whole process). Production deployment needs to revisit the lifetime — sd's tx may not outlive the goroutine. Step 4 of the storage-trunk pin prototype. Bench measurement is the next step (commit 5).
Previous async-goroutine shape (d204c1b) shared the SD's MDBX tx with the calling thread. Concurrent cursor use under the same tx tripped Go's cgo-pointer-pinning runtime check: panic: runtime error: cgo argument has Go pointer to unpinned Go pointer surfacing in an unrelated PruneBlocks goroutine during boot. Make the preload synchronous in the SD constructor for now: same TryClaimPreload guard (fires once per cache lifetime), but no goroutine. Boot pays the per-contract preload time as a one-off. Background-with-own-tx is the proper shape and remains a follow-up; owning the SD's tx exclusively for the preload duration is the safe shape until that lands.
… cap The previous bench (run-pin-trunk-instrumented-cold-cgroup-191347) hung at SD construction with no [trunk-preload] log lines for 5+ minutes. Erigon never reached "engine RPC ready" so all blocks came in as SYNCING. Two changes to localise + bound: 1. **Localisation**: add INFO logs at triggerTrunkPreload entry, per-contract starting/done with took, and a 500-prefix progress log inside PreloadContractTrunk. Whatever it does (or hangs on) is now observable. 2. **Bound**: cap PreloadContractTrunk at 10000 branches (vs ~4.4K expected for a saturated 4-level subtree at maxDepth=67). Drops maxDepth from 70 → 67 in the trigger (depth 64-67 = 16+256+4096 max branches) so we don't recurse into the per-slot tail where pinning has no value. Preload fails-fast on pathological subtrees rather than blocking SD construction indefinitely.
The previous shape (d204c1b) ran triggerTrunkPreload BEFORE sd.SeekCommitment in NewSharedDomains. Bench result: when the preload fired (PIN_CONTRACT_TRUNKS set), every subsequent block came back SYNCING — engine kept attempting backward-download which fails on this peerless setup, no block ever validated, no cache-fp ever fired. Without the preload firing, the same binary works fine (verify-bench PASS at 3.26s). Hypothesis (untested but matches the symptom): preload's sd.GetLatest reads ran before SeekCommitment had resolved the SD's view of the chain head. Pinned values were therefore inconsistent with the committed state, and the trie compute on the first block got wrong root → SYNCING → backward-download → no peers → death spiral with no Flush ever updating the (stale) pinned entries. Fix is mechanical: move the preload call to after SeekCommitment. The TryClaimPreload guard still ensures fire-once-per-cache lifetime. If subsequent bench shows pin_count > 0 + pin_hit > 0 + blocks validating normally, the hypothesis is confirmed; if SYNCING repeats, the bug is something else and we need to revert and debug differently.
…ParaTrieDB Previous prototype iterations both broke block validation: 1. Async sharing the SD's MDBX tx (d204c1b) → cgo "unpinned Go pointer" panic from concurrent cursor use. 2. Synchronous from NewSharedDomains (5a81976 / 4c9ead456d) → blocked the engine HTTP handler for ~3-4s during the preload window, causing the bench's first NewPayload to be dropped. Confirmed: the bench's height=24358001 is ABSENT from the erigon log; the next received block (24358002) then fails backward-download (no peers) → SYNCING forever. Restructure: - Move trigger from NewSharedDomains to EnableParaTrieDB. The latter is called from the staged-sync exec-stage init, NOT from request handlers, AND has access to a kv.TemporalRoDB. - triggerTrunkPreload now takes the DB (not a tx) and spawns a goroutine that opens its OWN tx via db.BeginTemporalRo. No shared cursors with the main pipeline; no blocking the engine. - Reader uses tx.GetLatest directly (not sd.GetLatest) — the SD layering would re-introduce shared-state risk and isn't needed (pinned bytes don't depend on sd.mem state). Same TryClaimPreload guard ensures the preload fires once per BranchCache lifetime regardless of how many SDs construct. If this works the bench should: - Show [trunk-preload] log lines firing once - Pin ~4369 branches - TEST block cache-fp shows pin_hit > 0 and files_comm < 1K - All blocks validate normally (no SYNCING failure)
Make the trunk-pin maxDepth configurable via env (default 67) so we can sweep depths to find the memory/perf sweet spot without rebuilding. Bump the per-contract maxBranches cap from 10K to 200K so deeper saturated subtrees don't get truncated mid-walk.
The previous code disabled the Warmuper for the parallel commitment path out of concern that it would interact with the calculator's SetUpdates call. In practice the Warmuper's reads are independent of the calculator's update buffer — they pre-fetch branch data while EVM execution runs, and the calculator's SetUpdates only affects ComputeCommitment's input set, not the warmup paths. Re-enabling produces a measured 8× throughput improvement on the perf-devnet-3 SSTORE-bloated benchmark (block 24358306, the canonical fixture for #20920), restoring the win first observed in Run H/I of the trie-perf investigation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds atomic counters (branch hit/miss/evict + bytes-served, account hit/miss, storage hit/miss) to WarmupCache, plus a Stats() string formatter and ResetStats() for per-Process accumulation reset. Counters are updated on every Get/Evict path (existing Put paths were already counted via cache size). Useful for: - Confirming warmup effectiveness in production logs - Per-block diagnostics when investigating commitment perf - Future per-pool dashboards once a coordinator/observability layer lands (tracked separately) No behavior change beyond the counter updates themselves. Stats() format is one line, suitable for embedding in the existing LogCommitments output. ResetStats() zeros counters without touching cached data — useful for per-Process windowed measurement. Clear() also resets counters along with the data, since data and counters were accumulated together. Test: TestWarmupCache_Stats covers hit/miss/evict accounting across branch/account/storage paths and verifies Stats() format + ResetStats() preserves data. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Pure refactor — behavior preserved. Lifts the unfold-loop from
HexPatriciaHashed.followAndUpdate into its own method, parameterized
over (hashedKey, plainKey) and intended as the per-key traversal
primitive that future orchestrators consume.
Today only followAndUpdate calls it, replacing the inline loop with a
one-line call. The extracted method preserves the existing metric
attribution (StartUnfolding) and trace-print behavior verbatim.
Why now: this is the second step in the representation-reduction
sequence (see agentspecs/trie-data-pipeline-complexity-tax.md). Future
PRs will introduce orchestrators that drive unfold-only walks of
touched-key paths to fill cell state without going through the full
fold/update cycle:
- Cache populator (decoded-payload BranchCache) needs to walk a
touched-key path and capture the cells encountered, without
triggering fold or modifying the trie's update buffer.
- Stage E parallel pre-unfold orchestrator drives unfoldKeyPath
across multiple HexPatriciaHashed instances concurrently to
pre-warm trie state before commit.
Both consume the same primitive. Centralising it now means each future
orchestrator is a thin wrapper rather than a duplicate of the
unfold-loop logic.
Tests: full commitment test suite passes without modification (all 8+
test files in execution/commitment/), confirming the refactor preserves
followAndUpdate's behavior.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds the carry-as-is correctness invariants from the PR #19954 investigation as scaffolding on the existing WarmupCache: - branchEntry.dirty atomic.Bool — signals "stale until cleared" - PutBranchIfClean(prefix, data) bool — skips write if entry dirty - MarkBranchDirty(prefix) — mark for later refusal of stale puts These are scaffolding additions; no callsites use them yet. Existing PutBranch unconditionally overwrites and clears any prior dirty flag (creates a fresh entry), preserving today's semantic exactly for existing callers. Why now: the prototype investigation (see agentspecs/commitment-cache-prototype-dev-context.md) found that inline-invalidate-on-write is incompatible with deferred encoding — update-in-place breaks correctness because there's a window between fold (computes hash, holds new state) and encoder (writes encoded bytes) where readers see stale cached bytes. The reth-research (agentspecs/reth-1ggas-research.md §4) calls the dirty-flag pattern out as the design that resolves this without forcing synchronous encoding: the encoder marks the entry dirty BEFORE its own write completes, so any racing read knows to bypass the cache for that key. Today's WarmupCache lifecycle (per-Process, warmup completes before fold begins) does NOT exhibit this race — these invariants are infrastructure for the future cross-block persistence work where warmup-style writers can outlive their parent Process. Tests: - TestWarmupCache_DirtyFlag: PutBranchIfClean refuses dirty entry, unconditional PutBranch clears dirty. - TestWarmupCache_DirtyFlag_MarkAbsentKey: marking absent key is no-op (no panic, no entry created). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds an additive read method that returns cached branches in already- decoded form, lazy-decoding on first decoded-read per entry and caching the parsed cells for subsequent reads. No existing callsite changes; existing GetBranch / GetAndEvictBranch / PutBranch callers continue to work with encoded bytes unchanged. Why now: this is step 5 of the representation-reduction sequence (see agentspecs/trie-data-pipeline-complexity-tax.md). The trie's read path currently does GetBranch (encoded) + DecodeBranchInto on every cache hit — paying decode CPU on every read. Switching that callsite to GetBranchDecoded (in a separate later commit) eliminates the redundant decode. The ENCODED form remains the source of truth — the encoder needs it for the merge-with-prev step, and it's what gets written to disk via PutBranch. The decoded form is derived lazily and cached alongside the entry. When PutBranch overwrites an entry, the new entry starts fresh and the next decoded read re-derives from the new bytes. API design notes: - Returns (bitmap, *[16]cell, ok). Caller derives touchMap/afterMap from bitmap based on its own deleted-vs-present-after context — the cache stores cells independent of that context so the same entry serves both readers. - The returned *[16]cell aliases entry-owned storage. Read-only consumption is safe across concurrent calls (decode runs at most once per entry via sync.Once); MUST NOT be modified in place. - Decode error → ok=false (don't count as hit OR miss; caller falls through to canonical re-read). Tests: - TestWarmupCache_GetBranchDecoded: round-trip equality with direct DecodeBranchInto, plus same-pointer reuse on repeat reads. - TestWarmupCache_GetBranchDecoded_Miss: behaves like GetBranch on absent keys. - TestWarmupCache_GetBranchDecoded_TruncatedData: graceful failure on corrupt entry (no panic). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…ng payloads Closes a timing hole that surfaced once we wired the aggregator-scope BranchCache: between an FCU completing and the next newPayload, MDBX hasn't been committed yet (RunLoop's CommitCycle only fires under memory pressure), but currentContext.mem holds the latest writes from MergeExtendingFork. The fresh doms created in ValidateChain has no parent and a fresh roTx, so its ctx.Branch reads stale-MDBX while the aggregator-scope BranchCache (populated by the prior FV's CollectUpdate writes) holds the fresh state. That's the cross-newPayload divergence pattern observed in the bench (8-61 divergences and wrong-trie-root errors at block 3-14 across runs). Set doms.SetParent(currentContext) when the new payload extends the current canonical head (header.ParentHash == ReadHeadBlockHash). For fork payloads that don't extend head, leave parent unset: unwindToCommonCanonical below reverts doms's view to the common ancestor, and exposing currentContext.mem (post-divergence canonical writes) via the parent chain would shadow the unwound base and break fork validation. Verified by TestReorgsWithInsertChain — the "head-only" predicate is what the current single-canonical-chain SD topology supports. A proper per-branch SD lineage (each fork's validation chains to the last validated SD on its own branch, not always currentContext) is the follow-up needed for concurrent multi-fork validation. The current design supports a single canonical chain only; that's enough to close the divergence we have today, with the lineage extension tracked separately.
Foundation for the "Snapshot vs MDBX read-cost equivalence"
investigation (memory: snapshot-vs-mdbx-performance-equivalence.md).
This file produces the headline ratio that quantifies the gap the
investigation aims to close: warm-cache reads from snapshot .kv files
should cost the same as warm-cache reads from MDBX (same disk, same
page cache). H0 measures how far apart they are today.
Five sub-benches:
- MDBX_path full chain, key in MDBX
- File_path full chain, key in file
- Forced_file_path file-only debug path, file-resident keys
- Forced_db_path DB-only debug path, MDBX-resident keys
- Bloom_miss_path file-only debug path, MDBX-resident keys
(file misses in xorfilter for every probe)
Two operating modes; only synthetic is wired in this commit:
- Synthetic (testDbAndAggregatorBench fixture): writes 64 full
16-tx steps, BuildFiles + repeated PruneSmallBatches drains all
but the tip step into files. Phase 2 keys at txNums past the
built-step boundary stay in MDBX. Partition by *actual* residency
after setup so bench inputs match where keys really live.
- Real-datadir (--snapdatadir flag): TODO. Opens an existing
chaindata+snapshots datadir read-only and picks keys via cursor
iteration / .kv decompressor walk. Required for production-
relevant numbers since synthetic has tiny files and small values.
Initial synthetic results on AMD EPYC 4244P (Accounts domain):
MDBX_path 173 ns/op
File_path 226 ns/op (1.31x MDBX)
Forced_file_path 30 ns/op
Forced_db_path 158 ns/op
Bloom_miss_path 30 ns/op
Synthetic dataset is too small to surface the production gap that
pprof shows (xorfilter at 35% CPU on real bloat workload). H1-H4
benches and the real-datadir mode are the next steps.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds the --snapdatadir flag path to the H0 bench. Opens an existing
chaindata + snapshots datadir read-only via the same recipe as
cmd/integration (mdbx Accede + state.New + temporal.New) and picks
keys by cursor-walking the per-domain values table.
Pragmatic adjustments:
- On heavily-pruned production datadirs (perf-devnet-3-run was
100% pruned), every MDBX values-table row is step-shadowed by a
file, so getLatestFromDb returns ok=false. The MDBX-side
sub-benches skip in this case; File_path numbers stand on their
own and the synthetic MDBX_path baseline serves as the cross-
mode comparator.
- skipIfEmpty short-circuits per sub-bench rather than failing the
whole run, so we can still get the file-path numbers.
First production numbers (AMD EPYC 4244P, AccountsDomain, 2012
file-resident keys from perf-devnet-3-run, fully pruned):
File_path 211 ns/op (synthetic was 226; essentially same)
Forced_file_path 30 ns/op (synthetic was 30; identical)
Surprising finding: real .kv file reads cost the same as synthetic.
This means production bloat-workload bottleneck is NOT in
getLatestFromFiles — it must be in HistorySeek (.ef history files
walked by HistoryStateReader.GetAsOf). The GetAsOf shortcut work
flagged in getasof-regression-suspect.md is the right lead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Two related additions to the snapshot-vs-MDBX perf-equivalence
investigation (memory: snapshot-vs-mdbx-performance-equivalence.md):
1. H_GetAsOf bench (db/state/snapshot_vs_mdbx_bench_test.go).
New runHGetAsOf with four sub-benches for HistorySeek-via-GetAsOf
on file-resident keys: GetLatest_baseline, GetAsOf_recent (asOf
near endTxNum), GetAsOf_mid (asOf at endTxNum/2), GetAsOf_floor
(asOf=1). Tests the path the calculator's HistoryStateReader.Read
uses, which is distinct from getLatestFromFiles measured in H0.
Real-datadir results on perf-devnet-3 (AccountsDomain, endTxNum=2.9B):
GetLatest_baseline 202 ns/op 0 allocs
GetAsOf_recent 570 ns/op 0 allocs <- 2.8x baseline, no result
GetAsOf_mid 235 ns/op 5 allocs
GetAsOf_floor 196 ns/op 4 allocs
GetAsOf_recent (the calculator's pattern after PR #21010) scans
the .ef looking for a record at-or-after endTxNum-1, finds none
(most keys haven't changed in the last txNum), falls through to
GetLatest. The 370ns/op overhead vs GetLatest is wasted scan.
Confirms the GetAsOf shortcut described in
getasof-regression-suspect.md as a real lever, though small in
absolute terms (~2ms/block on the bloat workload).
2. Surface "took" + "keys" on the existing [commitment][cache-fp]
Info log line (commitmentdb). Was already computed in the
debug-level "[commitment] processed" log, but the bench runs with
--log.dir.disable so debug logs aren't captured.
This made it possible to attribute the 4.3s gap inside
newPayload(TEST block) directly: the calculator's ComputeCommitment
takes 4220ms for the 5910-key bloat block — 91% of the entire
block wall time. Per-key cost is ~700us, consistent across blocks
of all sizes. The actual perf lever for the bloat workload is
making per-branch ComputeCommitment cheaper, not file/state reads.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds three groups of fields to the existing
[commitment][cache-fp] log line so the calculator's per-block
behaviour is observable at Info level (the bench runs with
--log.dir.disable, so debug logs aren't captured):
- took, keys: ComputeCommitment wall + key-count for the block.
Pre-existing internally, now surfaced.
- load, skipped, reset: process-cumulative counts of
computeCellHash decisions:
* load = had no memoized stateHash, fetched value from DB
* skipped = had memoized stateHash, reused without fetch
* reset = had stateHash but had to invalidate it
Surfaced via new commitment.SkipLoadResetCounters().
- files_acc / files_sto / files_code / files_comm: per-domain
file-read counts pulled from sd.Metrics().Domains[domain].
Decomposes the aggregate `files=N` from the [domain reads]
log line into its actual sources (e.g. on the SSTORE-bloated
block the 32k file reads break down as 5.9k Storage value
loads + 26.6k Commitment branch reads + a handful of others).
All counters are cumulative; per-block deltas are obtained by
subtracting consecutive cache-fp lines.
Pure observability — no behaviour change. Used as the measurement
framework for the snapshot-vs-MDBX perf-equivalence investigation
and the follow-on commits that target specific levers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…poralTx The overlay is a general KV/temporal db, not block-specific, so drop the misleading Block prefix (and ParentBlockOverlayTemporalTx -> ParentOverlayTemporalTx).
It was just OverlayTemporalTx on the parent, existing only to reach the unexported parent field from another package. The sole caller runs before InitBlockOverlay, so doms has no overlay of its own and OverlayTemporalTx already yields exactly the parent chain.
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| view := sd.OverlayTemporalTx(roTx) | ||
| e.lock.RUnlock() | ||
| return view, func() { roTx.Rollback() }, nil |
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Requesting changes on 868efdcf4e. All nine blockers from the last round are addressed, and the merge of main (1e9bae94fe) audited clean. The items below are new findings, mostly in the fixes themselves — consolidated from my pass, the open Copilot threads (each re-verified against this head), and a Codex pass.
P1
-
Chain-aware
HasPrefixcan self-deadlock via recursiveRLock.db/state/execctx/domain_shared.go:881:confirmruns insidep.mem.IteratePrefix, which holdslatestStateLock.RLockacross callbacks (db/state/temporal_mem_batch.go:710), andgetLatestMeteredre-RLocks the same mutex viasd.mem.GetLatest. Once a writer queues (putLatest— everyDomainPut— takes the write lock), the innerRLockblocks behind it: under background commit + parallel exec, an exec worker's create-collisionHasPrefixand the apply goroutine'sDomainPutwedge each other mid-block. Same shape on parent mems vscloseAllGens→ClearRam. Restructure to the two-phase shapeIteratePrefixalready uses (collect candidates under the lock, resolve after it is released) — that also makes the returned "first live key" follow global key order, which is what the docstring claims; today it is per-generation scan order. -
A failed background commit still lets queued descendants commit over the hole.
execution/execmodule/bg_commit.go:158: the failure branch triggersstopNodeasynchronously and returns;genEpochis unchanged, so the worker's next iteration commits an already-queued child generation before cancellation propagates. Each generation flushes only its own delta, so the DB advances past the failed parent with its state missing — durable, and it survives the restart the fatal path exists to enable. Poison synchronously before returning: bumpgenEpochunderfgMu(the supersede machinery already skips stale generations) or a terminal worker flag checked atrunCommitentry.
P2
-
WaitIdletears down after its foreground barrier times out.execution/execmodule/exec_module.go:356with the 5s production timeout (node/eth/backend.go:1594): on timeout it still runsstopCommitWorker+closeAllGens, so a slow FCU keeps reading through parent SDs while they are closed and wiped (misses degrade to stale committed reads untilbacgroundCtxcancellation aborts the run), and its laterenqueueCommitparks a generation with an open roTx in a channel nobody drains — thechainDB.ClosehangWaitIdleexists to prevent. (Covers the open Copilot thread onexec_module.go:331.) On timeout, don't close generations: bumpgenEpoch, makeenqueueCommitrefuse stale/post-stop generations (roll the generation back instead of parking it), and log loudly — a visible bounded wait beats closing SDs under a live reader. -
The prune handoff dropped main's eager cleanup ordering.
execution/execmodule/forkchoice.go:795spawns the prune goroutine without callingcleanupBeforeSemaRelease()first (main'shandOffSemaphoredid).ResetPendingUpdates/ClearWithUnwindnow always run concurrently withRunPrune, and a fast prune canfgReleasebefore the deferred cleanup runs, so the next acquirer observes unsettled state — the invariant documented atforkchoice.go:376. One line: runcleanupBeforeSemaRelease()beforego; the "run this eagerly" comment is stale for both handoff paths. -
beginOverlayOrRocan return a nil view with a nil error (confirms today's Copilot thread).execution/execmodule/getters.go:80:flushBlockOverlayToDB(bulk >16-blockInsertBlocks) callssd.CloseBlockOverlay()(inserters.go:52) withoute.lock, so the overlay can vanish between the getter'sBlockOverlay()check andOverlayTemporalTx's re-load —GetPayloadBodies*then panics on the nil tx. A plain fallback to the already-open roTx is not enough: that snapshot predates the overlay flush and would miss the just-inserted blocks. Either takee.lockaround the close, or on a nil view roll back and retry with a fresh roTx. -
The txpool cache swap is still ungated.
node/eth/backend.go:735hands the txpool the published-SDCacheeven withFcuBackgroundCommit=false— a default-path behavior change this PR states it avoids. The read-after-close path degrades safely (mem reads are lock-serialized; misses fall through), but a view spanning FCU teardown falls back to a pre-commit coreTx → transient stale nonce/balance, andOnNewBlockis a no-op so nothing refreshes it. Gate the swap on the flag now; the leased/refcounted published SD is #22494.
P3
db/kv/membatchwithdb/memory_mutation.go:962,995—MemoryMutation.GetAsOf/HistorySeekstill swallow DomainReader errors (err == nil && ok); mirror the read-view fix.- Shutdown runs
WaitForWarmupafterWaitIdle/closeAllGens(node/eth/backend.go:1593-1605) whilewarmBodyreads the published SD. Reordering alone is insufficient (newPayloadcan spawn new warmups); add a stop-gate on the read-aheader, then join. TestNotificationDispatchBackgroundCommit(execution/execmodule/exec_module_test.go:1831) is still skipped with a rationale theSetParentchain has since fixed, and no tracking issue. Un-skip (likely green), and add a failure-interleaving test pinning point 2 (a failed commit must not let a descendant commit).- The chain path of
IteratePrefix(db/state/execctx/domain_shared.go:913) materializes every candidate key before the first emit — early-exit callers lose streaming, and a catchup-window self-destruct of a large pre-Cancun contract under an in-flight generation spikes memory. Streaming merge, or at least a comment. - Comments/docs:
HasPrefixcarries two stacked doc paragraphs (domain_shared.go:862-874) — keep one, stating the real ordering contract;enqueueCommit's "non-blocking by design" (bg_commit.go:97) holds only via themaxInFlightCommitsbound (open Copilot thread);RawBlock.AsBlock(execution/types/block.go:811) should route throughSetBlockAccessListfor uniform no-aliasing (currently unreachable — zero non-test callers; open Copilot thread). - Range/stream readers remain leaf-only (
SharedDomains.RangeAsOf/HistoryRange/IndexRange) or committed-only (viewRangeAsOf/IndexRange/HistoryRange); list them explicitly on the #22494/#21314 pre-default-flip checklist. - Carried nits: the
exec3_serial.goblockNum > 0hunk still has no stated connection to this PR;GenerateChainstill usesreadSD[0]without asserting it matchesparent.
Copilot thread housekeeping
Resolvable as fixed on this head: the config default, GetAsOf/HistorySeek parent walks, EachStorageSlot error propagation, the BAL copy (the clone lives in Block.SetBlockAccessList), and the forkchoice "worker republishes overlay" comment. Resolvable with tracking pointers: both drainCommittedGens threads (#22494) and the getProof thread (#21314). Folded into the items above: WaitIdle (point 3), the enqueueCommit comment and AsBlock (point 11), beginOverlayOrRo (point 5). Stale: the FlushKeepMem thread (that API left the PR).
Process
The only red check is infra (kurtosis: command not found on the runner) — re-run. The PR is conflicting with main; after the next merge please repeat the per-file clobber audit (git diff <merge>^1 <merge> -- <PR files>).
- domain_shared: make HasPrefix/IteratePrefix two-phase (collect candidates under the mem read lock, resolve after releasing it) — the previous shape re-entered the same RWMutex via getLatest inside an IteratePrefix callback and could deadlock a queued DomainPut writer. HasPrefix now returns the first live key in global key order. - bg_commit: poison the commit stream synchronously on a failed durable commit so no already-queued descendant generation commits its delta over the hole before shutdown propagates; enqueueCommit rolls a generation back instead of parking it once poisoned. - exec_module: on WaitIdle timeout (foreground op still holding the semaphore) do not close the generation chain under the live reader — poison, stop the worker, and log; only close generations on a clean acquire. - forkchoice: run cleanupBeforeSemaRelease() before handing the semaphore to the background prune goroutine so pending-update/unwind cleanup can't race prune. - getters: guard beginOverlayOrRo against a nil view when the overlay is flushed concurrently — retry with a fresh roTx that sees the flushed blocks. - memory_mutation: MemoryMutation.GetAsOf/HistorySeek stop swallowing the DomainReader error. - un-skip TestNotificationDispatchBackgroundCommit (the SetParent chain fixed it).
# Conflicts: # execution/builder/block_builder.go # execution/execmodule/block_building.go
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Pushed 928dbef + merge da3d119 (build + P1
P2
P3
Still open (tracked, not in this push): 8 (read-aheader stop-gate at shutdown), 10 (streaming The merge touched |
yperbasis
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Please split this PRs into several smaller ones – right now it's too big to review. Ideally they should be independent, but can be stacked if necessary. Correctness fixes should come first.
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Proposed splitPer the request to break this up, here's the shape. The correctness fixes that don't depend on the background-commit machinery come out as three independent PRs, each based on PR 1 — exec/RPC robustness (independent)
PR 2 — overlay / mem-batch read correctness (independent)
PR 3 — block access list as a first-class block object (independent)
This PR (#21414) — FCU background commit (rebased onto the above once they land)
Merge order (our discipline)PR 1, PR 2, PR 3 are independent and can merge in any order. This PR is held until all three are in I'll open PRs 1–3 next. |
This was referenced Jul 30, 2026
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Opened the three independent PRs (all based on
Merge order/discipline: #22892, #22893, #22894 are independent and can merge in any order; this PR is held until all three land, then rebased so its diff is only the background-commit change. (One adjustment from the proposed shape: the "standalone inverted-index writes in a local collection" change turned out to depend on the in-mem-history-reads infrastructure this PR builds — on |
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…llowing them (erigontech#22893) Independent correctness fix split out of erigontech#21414 (per the request to break it up). Stands alone on `main`. `MemoryMutation` and `OverlayTemporalReadView` `GetAsOf`/`HistorySeek` gated the `DomainReader` result with `err == nil && ok`, so a reader error fell through to the committed tx and was silently hidden. This propagates the error and keeps the `ok`-based committed fallback (a tombstone is `ok=true`, so it is not resurrected). No dependency on the background-commit work; part of the split recorded on erigontech#21414.
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Independent correctness fixes split out of erigontech#21414 (per the request to break it up). Each stands alone on `main`. - **eth_getProof**: guard a nil header (no crash when the header is missing). - **serial exec**: don't persist a genesis changeset. - **parallel exec**: treat an empty apply-loop close as clean completion rather than "more work pending" (with a regression test). No dependency on the background-commit work; part of the split recorded on erigontech#21414.
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…rigontech#22894) Independent refactor split out of erigontech#21414 (per the request to break it up). Stands alone on `main`. EIP-7928 Block Access Lists are part of the payload and should be consumed by execution from the block it is handed — the same model as headers and bodies. Previously the BAL only existed transiently on `RawBlock` during InsertBlocks and `RawBlock.AsBlock` dropped it, so the block object never carried its own BAL and exec re-read it from the DB. - `types.Block` gains an unexported `blockAccessList` sidecar (`BlockAccessList`/`SetBlockAccessList`), carried out-of-band and never in the block RLP/hash; `SetBlockAccessList` copies the input so a tx-owned slice can't alias it. Regression test pins it out of RLP/hash. - newPayload attaches the payload's BAL to the block; exec consumes it from the block, falling back to the DB sidecar for snapshot/forward-sync blocks. Behaviour-preserving: the `!dbg.IgnoreBAL` gate and BAL validation are unchanged — this only changes where exec sources the BAL (block vs redundant DB re-read). It's the plumbing that lets the parallel/fold-ahead commitment (in erigontech#21414) consume the BAL; nothing computes commitment in parallel from it by itself. Part of the split recorded on erigontech#21414. --------- Co-authored-by: Alexey Sharov <askalexsharov@gmail.com>
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The 3 spin-off PRs have been merged into main. Plz merge latest main into this PR.
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@mh0lt Is the title still accurate and comprehensive? |
# Conflicts: # db/rawdb/accessors_chain.go # db/state/execctx/domain_shared.go # execution/exec/blocks_read_ahead.go # execution/exec/blocks_read_ahead_test.go # execution/execmodule/execmoduletester/exec_module_tester.go # execution/stagedsync/exec3.go # execution/stagedsync/exec3_parallel.go
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Merged current This was not a mechanical merge — since this PR branched,
The standalone content of the three spin-off PRs (#22892/#22893/#22894) is now common with |
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Re the title — you're right it was stale. Updated to "execution: FCU background-commit worker + generation-chain reader consistency" — the two halves the PR now is after the spin-offs landed. Dropped the "PR #4 of the perf stack" framing since the predecessors are merged. |
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| // starts no background-commit worker — tests set DB state themselves and read | ||
| // it back deterministically. Exported from a _test.go file: usable by the | ||
| // execmodule_test binary, never compiled into a production build. | ||
| func NewGetterMockForTest(db kv.TemporalRwDB, blockReader dbservices.FullBlockReader, engine rules.Engine, config *chain.Config, logger log.Logger) *ExecModule { |
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we should remove this and use ExecModuleTester instead
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this feature should be behind a feature flag and disabled by default because it doesn't solve any current high performance bottleneck. our efforts should be centred around new payload, not background flushing at this point in time
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Important
Perf stack PR #4. Predecessors #21380 (State Cache Consolidation) and #21386 (branch/code cache rework) are merged; this PR is based on
main.Summary
Decouples the FCU semaphore from the post-FCU flush+commit+prune so async-commit (
--fcu.background.commit=true) actually delivers the throughput it promises. Previously the semaphore was held for the whole commit window, so FCU(N+1) waited on FCU(N)'s MDBX commit — async commit was a regression. This PR moves the commit to a background worker, releases the semaphore the momentupdateForkChoicereturns, and chains FCU(N+1)'s in-memory state to FCU(N)'s in-flight commit generation so reads cascade through it instead of a stale DB.Gated by the existing
fcuBackgroundCommitflag. In this PR the default is temporarilytrueso CI exercises the background-commit path under full load; it will be reverted tofalsebefore this PR merges (see below). Both paths produce the same execution and the same durable state; the only thing background commit changes is timing — the flush+commit moves off the FCU critical path so the durable write lands slightly later. What is executed and what is committed are identical.Default flip: temporary, reverted before merge
This PR currently sets
fcuBackgroundCommit = trueby default so CI exercises the background-commit path under full load. Before this PR merges, the default will be reverted tofalse. The permanent flip ships in a follow-up once the safety prerequisites land:drainCommittedGensis a no-op today → OOM risk); make the background worker yield to foreground rather than hold the semaphore; coordinated in-flight-SD unwind forSetHead.SharedDomainsto production readers (eth_getProof, parity storage keys) instead of the test-only resolver.Until then, background commit stays opt-in in production.
Mechanism
updateForkChoicereleasese.semaphorebefore the bg commit goroutine spawns — not afterrunPostForkchoice. Next FCU is no longer blocked on the previous commit's MDBX fsync.execution/execmodule/bg_commit.go: a single FIFO commit worker, plusfgTryAcquire/fgAcquire/fgReleasewrappers that every foreground op (FCU / ValidateChain / InsertBlocks / AssembleBlock / SetHead) registers through. The worker acquires the foreground semaphore before each commit, so the commit RwTx never overlaps a foreground roTx and never pins MDBX pages — no freelist/DB growth. An in-flight commit is never aborted: a foreground op that arrives mid-commit just makes the next commit wait. (Making the worker yield to foreground instead of holding the semaphore — true foreground priority — is the execution/execmodule, node/shards: remove the global Events.LatestSD published-SD pointer (decouple readers via a publication id) #22494 follow-up.)SharedDomainsSetParent()s to the newest generation so it reads not-yet-committed domain state.drainCommittedGens, run under the semaphore at FCU entry, closes the chain as a unit once every generation has committed.ValidateChain,InsertBlocks, and the FCUcurrentContextall init their block overlay from the latest in-flight generation'sBlockOverlayTemporalTx, so headers/bodies/TDs/receipts written by InsertBlocks(N) are visible to ValidateChain(N+1) before the async commit lands. Closes the "txns not found in block" engineapi failure.Close, the commit channel is closed undercommitMu, and the WaitGroup is joined beforeExecModule.Closereturns. No morefor range commitChdeadlock at DB-close.rpc/jsonrpc/*andtxpoolread through the in-flight SD via a published-leaf provider whencurrentContextis nil (during a bg commit). The outer layer (RPC / txpool / builder) reads the most-recently-PUBLISHED SD leaf snapshot, never the executor's actively-mutatedcurrentContext, so cross-RPC consistency (e.g.getTransactionCountvstxpool validateTx) is preserved across the async-commit window. Latest-block metadata reads (block number / current header) are routed through the published SD block overlay so they see in-flight blocks; latest-state readers still on the raw DB (eth_getProof, parity storage keys) are Build SD-aware temporal view to remove FcuBackgroundCommit RPC plain-tx reverts #21314.SharedDomainsimplementation feature (only the SD writes it), and all reads go through the in-flight SD — found thewarmBodyblock prefetcher was the one violator: it read the raw tx and wrote the process-global cache directly, and under background commit read state behind the tip. It now prefetches through the published SD (own coordinated tx, read viaAsGetter), so reads see in-flight tip state and cache population happens in the SD's own read-fill. This removes the anomaly and collapses the two cache-fill sites into one. (Follow-up execution: SD-owned run-task worker abstraction + drop the parallel-exec scheduler queue #22520: an SD-owned run-task API and dropping the parallel-exec start queue.)Files
execution/execmodule/bg_commit.goexecution/execmodule/{exec_module,forkchoice,inserters,set_head,scoped_read,block_building}.godb/state/execctx/domain_shared.go,db/state/temporal_mem_batch.go,db/kv/kv_interface.godb/kv/membatchwithdb/memory_mutation.gorpc/jsonrpc/*.go,rpc/rpchelper/helper.go,node/eth/backend.goValidation
make lintclean.TestEngineApiExecBlockBatch…ReorgDepth…Unwind(engineapi async-commit suite, seeexecution/engineapi/) — the repro for the original "txns not found in block" failure. Flips green with this PR; pre-fix it was 0/12.execution/execmodulepackage green under-racein both serial and parallel exec modes.Out of scope (tracked follow-ups)
fcuBackgroundCommit— ships in a follow-up gated on execution/execmodule, node/shards: remove the global Events.LatestSD published-SD pointer (decouple readers via a publication id) #22494 and Build SD-aware temporal view to remove FcuBackgroundCommit RPC plain-tx reverts #21314 (see "Default flip" above).SetHeadcoordinated unwind — execution/execmodule, node/shards: remove the global Events.LatestSD published-SD pointer (decouple readers via a publication id) #22494.eth_getProof, parity) — Build SD-aware temporal view to remove FcuBackgroundCommit RPC plain-tx reverts #21314.Flush+FlushKeepMeminto a singleFlush(ctx, tx, drain bool)) — non-semantic refactor; ships as its own follow-up so this PR's review surface stays focused on the semaphore semantics.MergeDuringCompute/ aggregator merge yield (the auto-yield-during-execution direction) — separate plan, not in this PR.Related
project_fcu_semaphore_decouple_planfor the design history (including rejected implementation passes before the current converged shape).