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// Copyright 2022 The Tint 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
//
// https://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.
// benchdiff is a tool that compares two Google benchmark results and displays
// sorted performance differences.
package main
import (
"errors"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
"dawn.googlesource.com/tint/tools/src/bench"
)
var (
minDiff = flag.Duration("min-diff", time.Microsecond*10, "Filter away time diffs less than this duration")
minRelDiff = flag.Float64("min-rel-diff", 0.01, "Filter away absolute relative diffs between [1, 1+x]")
)
func main() {
flag.ErrHelp = errors.New("benchdiff is a tool to compare two benchmark results")
flag.Parse()
flag.Usage = func() {
fmt.Fprintln(os.Stderr, "benchdiff <benchmark-a> <benchmark-b>")
flag.PrintDefaults()
}
args := flag.Args()
if len(args) < 2 {
flag.Usage()
os.Exit(1)
}
pathA, pathB := args[0], args[1]
if err := run(pathA, pathB); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(-1)
}
}
func run(pathA, pathB string) error {
fileA, err := ioutil.ReadFile(pathA)
if err != nil {
return err
}
benchA, err := bench.Parse(string(fileA))
if err != nil {
return err
}
fileB, err := ioutil.ReadFile(pathB)
if err != nil {
return err
}
benchB, err := bench.Parse(string(fileB))
if err != nil {
return err
}
cmp := bench.Compare(benchA.Benchmarks, benchB.Benchmarks, *minDiff, *minRelDiff)
diff := cmp.Format(bench.DiffFormat{
TestName: true,
Delta: true,
PercentChangeAB: true,
TimeA: true,
TimeB: true,
})
fmt.Println("A:", pathA, " B:", pathB)
fmt.Println()
fmt.Println(diff)
return nil
}
func fileName(path string) string {
_, name := filepath.Split(path)
return name
}