common/dbg: default EXEC3_PARALLEL=true#21591
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Flip the EXEC3_PARALLEL env var default from false to true, making parallel execution the default for plain `./build/bin/erigon` runs. Setting EXEC3_PARALLEL=false (or ERIGON_EXEC3_PARALLEL=false) still forces the serial path. Depends on #21590 (the parallel-exec SD-revival and metamorphic-CREATE2 fixes) — that PR must merge first so the new default lands with the correctness fixes already in place. The 5-chain soak validation that backs the flip is documented in #21590's test plan.
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Summary
Flip the
EXEC3_PARALLELenv var default fromfalsetotrue, so a plain./build/bin/erigonrun uses parallel execution by default.EXEC3_PARALLEL=false(orERIGON_EXEC3_PARALLEL=false) still forces the serial path.One-line change in
common/dbg/experiments.go.Test plan
make erigonclean.make lintclean.Note on dependency
Backed by the soak validation done in #21590 (chiado from-0 to tip, sepolia from-0 past 4,913,058, hoodi/mainnet clean — see that PR's test plan). #21590 should land first so the new default ships with the correctness fixes already in place. If #21591 merges first by accident, users hitting the SD-revival / metamorphic-CREATE2 patterns in parallel exec would regress until #21590 lands.
A separate gnosis race-class bug (4 occurrences in ~300K blocks around 14.59M-14.89M, recurring + non-deterministic) surfaced during the same soak — it is not addressed by either PR and is tracked in docs/plans/20260602-gnosis-parallel-exec-race-14594499.md. Flipping the default doesn't make it worse: users who hit it can always set
EXEC3_PARALLEL=false.