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Merged
bwplotka merged 1 commit into from
Sep 9, 2026
Merged

Benchmark json-iter, stdlib json and json/v2 #2107

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154 changes: 102 additions & 52 deletions api/prometheus/v1/api_bench_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -120,76 +120,126 @@ func BenchmarkSamplesJsonSerialization(b *testing.B) {
}

b.Run("marshal", func(b *testing.B) {
b.Run("encoding/json/floats", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := json.Marshal(floats); err != nil {
b.Fatal(err)
b.Run("floats", func(b *testing.B) {
b.Run("json", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
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if _, err := json.Marshal(floats); err != nil {
b.Fatal(err)
}
}
})
if supportsJSONv2 {
b.Run("jsonv2", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsonv2Marshal(floats); err != nil {
b.Fatal(err)
}
}
})
}
})
b.Run("jsoniter/floats", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsoniter.Marshal(floats); err != nil {
b.Fatal(err)
b.Run("jsoniter", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsoniter.Marshal(floats); err != nil {
b.Fatal(err)
}
}
}
})
})
b.Run("encoding/json/histograms", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := json.Marshal(histograms); err != nil {
b.Fatal(err)
b.Run("histograms", func(b *testing.B) {
b.Run("json", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := json.Marshal(histograms); err != nil {
b.Fatal(err)
}
}
})
if supportsJSONv2 {
b.Run("jsonv2", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsonv2Marshal(histograms); err != nil {
b.Fatal(err)
}
}
})
}
})
b.Run("jsoniter/histograms", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsoniter.Marshal(histograms); err != nil {
b.Fatal(err)
b.Run("jsoniter", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := jsoniter.Marshal(histograms); err != nil {
b.Fatal(err)
}
}
}
})
})
})

b.Run("unmarshal", func(b *testing.B) {
b.Run("encoding/json/floats", func(b *testing.B) {
b.ReportAllocs()
var m model.Matrix
for i := 0; i < b.N; i++ {
if err := json.Unmarshal(floatBytes, &m); err != nil {
b.Fatal(err)
b.Run("floats", func(b *testing.B) {
b.Run("json", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := json.Unmarshal(floatBytes, &m); err != nil {
b.Fatal(err)
}
}
})
if supportsJSONv2 {
b.Run("jsonv2", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := jsonv2Unmarshal(floatBytes, &m); err != nil {
b.Fatal(err)
}
}
})
}
})
b.Run("jsoniter/floats", func(b *testing.B) {
b.ReportAllocs()
var m model.Matrix
for i := 0; i < b.N; i++ {
if err := jsoniter.Unmarshal(floatBytes, &m); err != nil {
b.Fatal(err)
b.Run("jsoniter", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := jsoniter.Unmarshal(floatBytes, &m); err != nil {
b.Fatal(err)
}
}
}
})
})
b.Run("encoding/json/histograms", func(b *testing.B) {
b.ReportAllocs()
var m model.Matrix
for i := 0; i < b.N; i++ {
if err := json.Unmarshal(histogramBytes, &m); err != nil {
b.Fatal(err)
b.Run("histograms", func(b *testing.B) {
b.Run("json", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := json.Unmarshal(histogramBytes, &m); err != nil {
b.Fatal(err)
}
}
})
if supportsJSONv2 {
b.Run("jsonv2", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := jsonv2Unmarshal(histogramBytes, &m); err != nil {
b.Fatal(err)
}
}
})
}
})
b.Run("jsoniter/histograms", func(b *testing.B) {
b.ReportAllocs()
var m model.Matrix
for i := 0; i < b.N; i++ {
if err := jsoniter.Unmarshal(histogramBytes, &m); err != nil {
b.Fatal(err)
b.Run("jsoniter", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var m model.Matrix
if err := jsoniter.Unmarshal(histogramBytes, &m); err != nil {
b.Fatal(err)
}
}
}
})
})
})
})
Expand Down
26 changes: 26 additions & 0 deletions api/prometheus/v1/api_bench_test_127.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
//go:build go1.27

// Copyright The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package v1

import (
jsonv2 "encoding/json/v2"
)

const supportsJSONv2 = true

var jsonv2Marshal = jsonv2.Marshal

var jsonv2Unmarshal = jsonv2.Unmarshal
28 changes: 28 additions & 0 deletions api/prometheus/v1/api_bench_test_pre127.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
//go:build !go1.27

// Copyright The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package v1

import "errors"

const supportsJSONv2 = false

func jsonv2Marshal(v any) ([]byte, error) {
return nil, errors.New("unsupported")
}

func jsonv2Unmarshal(data []byte, v any) error {
return errors.New("unsupported")
}
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