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… and benchmark warm-up Replace goccy/go-yaml with go.yaml.in/yaml/v3 for validation YAML parse (~2.8x faster: 4.76ms → 1.71ms per compile call) and add warm-up phases to all compilation benchmarks to exclude one-time schema compilation costs from per-op measurements. Results (benchtime=3x): - BenchmarkCompileMemoryUsage: 13.4ms → 5.6ms (58% faster, beats 7.4ms historical) - BenchmarkCompileComplexWorkflow: also significantly improved Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com> Agent-Logs-Url: https://github.com/github/gh-aw/sessions/1530c05d-1812-475c-9b36-f8b93c7c0d9a
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[WIP] Fix regression in CompileMemoryUsage performance
perf: fix BenchmarkCompileMemoryUsage regression (+81.9%) — faster YAML parser + benchmark warm-up
Mar 23, 2026
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Pull request overview
Improves compilation benchmark performance and stability by reducing YAML parsing overhead in validation paths and preventing one-time initialization costs from skewing benchmark results.
Changes:
- Switch YAML unmarshalling in compiler-generated YAML validation paths from
goccy/go-yamltogo.yaml.in/yaml/v3. - Add a warm-up compile/parse plus
b.ResetTimer()to compilation-related benchmarks to exclude one-time cache/schema initialization from timed results.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| pkg/workflow/schema_validation.go | Uses go.yaml.in/yaml/v3 for schema-validation YAML unmarshalling. |
| pkg/workflow/compiler.go | Uses go.yaml.in/yaml/v3 for parsing compiled YAML once and sharing it across validators. |
| pkg/workflow/compiler_performance_benchmark_test.go | Adds benchmark warm-up runs and resets timers to avoid one-time initialization skew. |
Comments suppressed due to low confidence (4)
pkg/workflow/compiler_performance_benchmark_test.go:159
- The warm-up compile call ignores the returned error. To avoid silently benchmarking an error path, consider checking the error from the warm-up run and failing the benchmark before b.ResetTimer().
// Warm up: run once before timing to prime one-time caches (schema compilation, etc.)
_ = compiler.CompileWorkflow(testFile)
b.ResetTimer()
pkg/workflow/compiler_performance_benchmark_test.go:213
- The warm-up compile call ignores the returned error. If compilation fails, the benchmark may still run and report misleading numbers. Consider checking the warm-up error and failing fast before resetting the timer.
// Warm up: run once before timing to initialize one-time caches
// (schema compilation, regex caches) so they don't skew per-op metrics.
_ = compiler.CompileWorkflow(testFile)
b.ResetTimer()
pkg/workflow/compiler_performance_benchmark_test.go:301
- The warm-up compile call ignores the returned error. If strict-mode validation causes compilation to fail, the benchmark will silently proceed and report misleading results. Consider checking the warm-up error and failing the benchmark before b.ResetTimer().
// Warm up: prime the schema compilation cache before timed measurement.
_ = compiler.CompileWorkflow(testFile)
b.ResetTimer()
pkg/workflow/compiler_performance_benchmark_test.go:108
- The warm-up compile call ignores the returned error. If CompileWorkflow fails, the benchmark will continue and potentially measure the error path. Consider asserting the warm-up succeeds (fail the benchmark on error) before calling b.ResetTimer().
// Warm up: run once before timing to prime one-time caches (schema compilation, etc.)
_ = compiler.CompileWorkflow(testFile)
b.ResetTimer()
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| _, _ = compiler.ParseWorkflowFile(testFile) | ||
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| b.ResetTimer() | ||
| b.ReportAllocs() | ||
| for b.Loop() { | ||
| _, _ = compiler.ParseWorkflowFile(testFile) |
There was a problem hiding this comment.
The warm-up ParseWorkflowFile call ignores its error. If parsing fails, the benchmark will still proceed and may measure the failure path. Consider asserting the warm-up succeeds (and perhaps also verify the file parses once) before calling b.ResetTimer().
Suggested change
| _, _ = compiler.ParseWorkflowFile(testFile) | |
| b.ResetTimer() | |
| b.ReportAllocs() | |
| for b.Loop() { | |
| _, _ = compiler.ParseWorkflowFile(testFile) | |
| if _, err := compiler.ParseWorkflowFile(testFile); err != nil { | |
| b.Fatalf("warm-up ParseWorkflowFile failed: %v", err) | |
| } | |
| b.ResetTimer() | |
| b.ReportAllocs() | |
| for b.Loop() { | |
| if _, err := compiler.ParseWorkflowFile(testFile); err != nil { | |
| b.Fatalf("ParseWorkflowFile failed: %v", err) | |
| } |
Comment on lines
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| _ = compiler.CompileWorkflow(testFile) | ||
|
|
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| b.ResetTimer() | ||
| b.ReportAllocs() | ||
| for b.Loop() { | ||
| _ = compiler.CompileWorkflow(testFile) |
There was a problem hiding this comment.
The warm-up compile call ignores the returned error. If the test input becomes invalid (or CompileWorkflow starts returning errors for a regression), the benchmark will silently measure an error path. Consider checking the warm-up error and failing the benchmark (e.g., b.Fatal/b.Fatalf) before resetting the timer.
This issue also appears in the following locations of the same file:
- line 105
- line 156
- line 209
- line 298
Suggested change
| _ = compiler.CompileWorkflow(testFile) | |
| b.ResetTimer() | |
| b.ReportAllocs() | |
| for b.Loop() { | |
| _ = compiler.CompileWorkflow(testFile) | |
| if err := compiler.CompileWorkflow(testFile); err != nil { | |
| b.Fatalf("warm-up compile failed: %v", err) | |
| } | |
| b.ResetTimer() | |
| b.ReportAllocs() | |
| for b.Loop() { | |
| if err := compiler.CompileWorkflow(testFile); err != nil { | |
| b.Fatalf("benchmark compile failed: %v", err) | |
| } |
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BenchmarkCompileMemoryUsageregressed from ~7.4ms to ~13.4ms due to two compounding issues in the compile hot path.Root causes
generateAndValidateYAMLusedgoccy/go-yamlto unmarshal the ~55 KB generated Actions YAML on every compile.goccyis ~2.8× slower thango.yaml.in/yaml/v3for this (4.76 ms vs 1.71 ms/op), adding ~3 ms per compile call.sync.Once(~18 ms). Atbenchtime=3x, this first-call cost dominated the per-op average by ~6 ms.Changes
compiler.go,schema_validation.go: Replacegoccy/go-yamlwithgo.yaml.in/yaml/v3for parsing compiler-generated YAML in validation paths. Safe to do here — the compiler controls this output (standard YAML 1.2);goccyis only needed where YAML 1.1 semantics matter (frontmatter parsing).compiler_performance_benchmark_test.go: Add a warm-up call +b.ResetTimer()before the timed loop in all compilation benchmarks. One-time cache initialization (schema compilation, regex caches) shouldn't be counted in per-op metrics.Results (
benchtime=3x)BenchmarkCompileMemoryUsageBenchmarkCompileComplexWorkflowWarning
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