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rubyspec-gate's expected-PASS list can be split into shards - #23
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make gate's slowest leg is rubyspec-gate's language suite, which runs every expected-PASS example in one pass with no way to split it across CI jobs. RUBYSPEC_SHARD=k/n keeps only every n-th expected-PASS example per suite (0-indexed offset k-1), so a fork running the gate's legs as parallel jobs can split language's 1,025 examples into two (or more) jobs instead of one. Each shard still runs its own "every listed example ran" and "no regression" check; running k=1..n covers the full expected-PASS list exactly once, so the shards' combined result is the same gate the unsharded target runs. Without the variable, the target is unchanged. Verified locally on core/range: a 1/2+2/2 and a 1/3+2/3+3/3 split each reproduce the full 200-example expected-PASS set with no overlap and no gaps, every shard passes with 0 regressions, and an unsharded run is byte-for-byte identical to the one before this change. The same partitioning math checked against language's actual expectations file (1,025 examples -> 513 + 512, union equal to the unsharded list). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe RubySpec gate supports optional ChangesRubySpec gate sharding
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Suggested reviewers: Merge Risk: 🟡 Moderate · up to A misconfigured CI shard can report success without checking any examples. Validate the shard setting before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Review comments at @Makefile:
- Line 3279: Validate RUBYSPEC_SHARD in the rubyspec-gate recipe before
extracting k and n or filtering with awk: require the k/n format, positive
integers, and k ≤ n. On invalid input, report an error and prevent the gate from
passing with an empty shard.
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Fixed in 5738b3b: validates |
An out-of-range RUBYSPEC_SHARD (k=0, k>n, or n=0) made the awk filter match no line, and a non-numeric one crashed awk outright -- in both cases the recipe kept going with an empty expected-PASS list, and the gate's own "ran == want, no non-PASS" check passed vacuously: "all 0 expected-PASS examples still pass" reads as a real pass. Reject the variable up front unless it is k/n with k and n both positive integers and k <= n, before it ever reaches the awk filter. Found by CodeRabbit on the fork PR; verified the vacuous-pass failure mode by hand before fixing it (RUBYSPEC_SHARD=0/2 and =5/2 each gave an empty shard with no error from the unguarded version). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Gate: green tree 196d316 master 9c7ea3c (linux-x86_64 gcc-13.3.0) tests 6421/0
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Opened upstream: matz#8012 |
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make gate takes a while even in parallel: splitting it across fork Actions jobs (corpus in TEST_SHARD slices, one job per rubyspec-gate suite, props, bench, optcarrot) gets it down to about 11-14 minutes, except for one leg. rubyspec-gate's language suite has no way to split: it runs every expected-PASS example (1,025 today) in one job, and stays the longest leg even with 4 workers.
RUBYSPEC_SHARD=k/n keeps only every n-th expected-PASS example per suite (0-indexed offset k-1), so a CI fork can run language (or any suite) as two or more parallel jobs instead of one. Each shard still runs the gate's own checks per suite ("every listed example ran", "no regression"); running every k from 1 to n covers the full expected-PASS list exactly once, so the shards' combined result is the same gate the unsharded target runs. Without the variable, make rubyspec-gate is unchanged.
Verified locally on core/range (200 expected-PASS examples): a 1/2+2/2 split and a 1/3+2/3+3/3 split each reproduce the full example set with no overlap and no gaps, every shard passes with 0 regressions, and a run without RUBYSPEC_SHARD is byte-for-byte identical to the one before this change. The same partition math checked against language's actual expectations file (1,025 -> 513 + 512, union equal to the full list).
Related: matz#6762 proposes widening what the gate covers; the bigger the gate gets, the more useful being able to split a suite becomes. No overlap: that issue is about which examples the gate defends, not about splitting execution of an already-enrolled suite.
Internal fork PR to pick up CI and CodeRabbit before opening upstream against matz/spinel.
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