wal/metadata_bench_test.go at main · mgurevin/wal · GitHub

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package wal

import (
	"context"
	"testing"
)

func BenchmarkFileWALStatePublishAtomic(b *testing.B) {
	benchmarkFileWALStatePublish(b, true)
}

func BenchmarkFileWALStatePublishInPlace(b *testing.B) {
	benchmarkFileWALStatePublish(b, false)
}

func benchmarkFileWALStatePublish(
	b *testing.B,
	atomicPublish bool,
) {
	if !supportsWALSynced() {
		b.Skip("Synced WAL is unavailable on this platform")
	}

	metadata, err := openFileMetadata(
		context.Background(),
		testFileWALConfig(secureWALBenchmarkDirectory(b)),
	)
	if err != nil {
		b.Fatal(err)
	}
	defer closeTest(b, metadata.close)

	state := metadata.state

	state.Generation++
	if err := metadata.publishState(state); err != nil {
		b.Fatal(err)
	}

	metadata.state = state

	syncsBefore, _ := metadata.fileSystem.syncStats()

	b.ReportAllocs()
	b.SetBytes(walStateBytes)
	b.ResetTimer()

	for b.Loop() {
		state.Generation++

		if atomicPublish {
			err = metadata.publishAtomic(
				walStateFilename(state.Generation),
				walStateTempFilename(state.Generation),
				encodeWALState(state),
			)
		} else {
			err = metadata.publishState(state)
		}

		if err != nil {
			b.Fatal(err)
		}

		metadata.state = state
	}

	b.StopTimer()

	syncsAfter, _ := metadata.fileSystem.syncStats()
	if b.N != 0 {
		b.ReportMetric(
			float64(syncsAfter-syncsBefore)/float64(b.N),
			"syncs/op",
		)
	}
}