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perf(block): precompute OTEL for chunker hot paths #2243
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60 changes: 60 additions & 0 deletions
60
packages/orchestrator/pkg/sandbox/block/chunk_bench_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| package block | ||
|
|
||
| import ( | ||
| "context" | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| sdkmetric "go.opentelemetry.io/otel/sdk/metric" | ||
|
|
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| blockmetrics "github.com/e2b-dev/infra/packages/orchestrator/pkg/sandbox/block/metrics" | ||
| ) | ||
|
|
||
| const ( | ||
| cbBlockSize int64 = 4096 | ||
| cbNumBlocks int64 = 16384 // 64 MiB | ||
| cbCacheSize int64 = cbNumBlocks * cbBlockSize | ||
| cbChunkSize int64 = 4 * 1024 * 1024 // 4 MiB — MemoryChunkSize | ||
| cbChunkCount int64 = cbCacheSize / cbChunkSize | ||
| ) | ||
|
|
||
| // BenchmarkChunkerSlice_CacheHit benchmarks the full FullFetchChunker.Slice | ||
| // hot path on a cache hit: bitmap check + mmap slice return + OTEL | ||
| // timer.Success with attribute construction. | ||
| func BenchmarkChunkerSlice_CacheHit(b *testing.B) { | ||
| provider := sdkmetric.NewMeterProvider() | ||
| b.Cleanup(func() { provider.Shutdown(context.Background()) }) | ||
|
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| m, err := blockmetrics.NewMetrics(provider) | ||
| if err != nil { | ||
| b.Fatal(err) | ||
| } | ||
|
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| chunker, err := NewFullFetchChunker( | ||
| cbCacheSize, cbBlockSize, | ||
| nil, // base is never called on cache hit | ||
| filepath.Join(b.TempDir(), "cache"), | ||
| m, | ||
| ) | ||
| if err != nil { | ||
| b.Fatal(err) | ||
| } | ||
| b.Cleanup(func() { chunker.Close() }) | ||
|
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| // Pre-populate the cache so every Slice hits. | ||
| chunker.cache.setIsCached(0, cbCacheSize) | ||
|
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| ctx := context.Background() | ||
|
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| b.ResetTimer() | ||
| for i := range b.N { | ||
| off := int64(i%int(cbChunkCount)) * cbChunkSize | ||
| s, sliceErr := chunker.Slice(ctx, off, cbChunkSize) | ||
| if sliceErr != nil { | ||
| b.Fatal(sliceErr) | ||
| } | ||
| if len(s) == 0 { | ||
| b.Fatal("empty slice") | ||
| } | ||
| } | ||
| } |
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RecordRawsilently dropst.kv(the base attributes stored byBegin(kv ...)). All current call sites pass no args toBegin(), so this is fine today. But sinceRecordRawis now exported, a future caller could dotimer := factory.Begin(sandboxID, ...)and then callRecordRaw, silently losing those base dimensions from all three metric recordings without any compile-time or runtime warning.Consider either: (a) merging
t.kvinto the precomputed option insideRecordRawwhent.kvis non-nil, or (b) keepingRecordRawunexported and only exposing it through the typedSuccess/Failuremethods.