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Shard the zero-cost gate and reuse baseline work across runs - #2365
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The full gate takes 30 to 75 minutes on one Sandbox, which made it the longest step of a validation round. It can now be split and merged: - --shard=i/n splits the bench and corpus programs (the self-hosted compiler runs in shard 1, or alone with --set=self), and scripts/zero-cost-merge.mjs merges the shards' --json reports into one verdict, recomputing the compile-time intervals over every shard. - --record-baseline-cache records the baseline's artifact hashes once; --baseline-cache skips the baseline build of every program whose candidate artifacts hash the same. The record is tied to the built baseline checkout, toolchain and paths. - The candidate-source self build overlaps the comparison builds on hosts with room for it. pnpm test:sandbox can reuse a prepared snapshot's LLVM helper and runtime pack (SCRIPTC_SANDBOX_NATIVE_REFERENCE) when their inputs are identical, and retries rate-limited Sandbox creation with backoff. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A recorded baseline entry now holds a hash of its program's inputs: the entry file and its relative imports (paths and contents) and the optimization level. --baseline-cache uses an entry only when the program still hashes the same, so a program or an import that changed since the record builds its baseline, instead of a recorded build error or artifact hash of the old sources settling the comparison as both-fail or identical. Records take schema 2; older records are ignored.
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A full validation round for a large change took agents about 3 hours in one 8-vCPU Sandbox; the zero-cost gate alone took 30 to 75 minutes of it. This makes the gate shardable and lets runs share baseline work.
--shard=i/nnow splits the bench and corpus programs (the self-hosted compiler runs in shard 1, or alone with--set=self).scripts/zero-cost-merge.mjsmerges shard--jsonreports into one verdict and recomputes the compile-time intervals over all shards.--record-baseline-cache=<file>builds only the baseline and records per-program artifact hashes;--baseline-cache=<file>skips the baseline build when the candidate's artifacts hash the same (or both sides fail with the same error). The record is keyed on a fingerprint of the built baseline checkout, toolchain and paths and is ignored on mismatch. The self program always builds both sides (its builds are timed).pnpm test:sandbox:SCRIPTC_SANDBOX_NATIVE_REFERENCEreuses a prepared snapshot's LLVM helper and runtime pack when their source inputs are identical, and rate-limited Sandbox creation (the team limit is a few hundred vCPUs per minute) retries with backoff instead of failing the lane.Measured on om/s3-pr1 (dc1e8ac) against 641f779, with six 32-vCPU gate shards plus a self shard: each bench+corpus shard took 3.0–5.1 min, the self shard 9.7 min, against 52 min for the unsharded gate in one 8-vCPU Sandbox.
Tests:
tests/harness/zero-cost-gate.test.ts(cache settlement, merge),tests/harness/sandbox-config.test.ts(native reference); lint and format clean.🤖 Generated with Claude Code