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benchmarks_test.go
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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package benchmarks
import (
"context"
"flag"
"internal/race"
"io"
"log/slog"
"log/slog/internal"
"testing"
)
func init() {
flag.BoolVar(&internal.IgnorePC, "nopc", false, "do not invoke runtime.Callers")
}
// We pass Attrs inline because it affects allocations: building
// up a list outside of the benchmarked code and passing it in with "..."
// reduces measured allocations.
func BenchmarkAttrs(b *testing.B) {
ctx := context.Background()
for _, handler := range []struct {
name string
h slog.Handler
skipRace bool
}{
{"disabled", disabledHandler{}, false},
{"async discard", newAsyncHandler(), true},
{"fastText discard", newFastTextHandler(io.Discard), false},
{"Text discard", slog.NewTextHandler(io.Discard, nil), false},
{"JSON discard", slog.NewJSONHandler(io.Discard, nil), false},
} {
logger := slog.New(handler.h)
b.Run(handler.name, func(b *testing.B) {
if handler.skipRace && race.Enabled {
b.Skip("skipping benchmark in race mode")
}
for _, call := range []struct {
name string
f func()
}{
{
// The number should match nAttrsInline in slog/record.go.
// This should exercise the code path where no allocations
// happen in Record or Attr. If there are allocations, they
// should only be from Duration.String and Time.String.
"5 args",
func() {
logger.LogAttrs(nil, slog.LevelInfo, testMessage,
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
)
},
},
{
"5 args ctx",
func() {
logger.LogAttrs(ctx, slog.LevelInfo, testMessage,
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
)
},
},
{
"10 args",
func() {
logger.LogAttrs(nil, slog.LevelInfo, testMessage,
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
)
},
},
{
// Try an extreme value to see if the results are reasonable.
"40 args",
func() {
logger.LogAttrs(nil, slog.LevelInfo, testMessage,
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
slog.String("string", testString),
slog.Int("status", testInt),
slog.Duration("duration", testDuration),
slog.Time("time", testTime),
slog.Any("error", testError),
)
},
},
} {
b.Run(call.name, func(b *testing.B) {
b.ReportAllocs()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
call.f()
}
})
})
}
})
}
}