blob: 771fd51ab764b11a171661b4fc9b74f933788861 [file] [log] [blame]
// Copyright 2019 The LUCI 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 exec2
import (
"os/exec"
"strconv"
"syscall"
"testing"
"golang.org/x/sys/windows"
)
func BenchmarkIterateChildThreads(b *testing.B) {
nop := func(uint32) error {
return nil
}
createProcess := func() *exec.Cmd {
cmd := exec.Command("go.exe")
cmd.SysProcAttr = &syscall.SysProcAttr{
CreationFlags: windows.CREATE_SUSPENDED,
}
if err := cmd.Start(); err != nil {
b.Fatal(err)
}
return cmd
}
b.Run("parallel", func(b *testing.B) {
cmd := createProcess()
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
if err := iterateChildThreads(uint32(cmd.Process.Pid), nop); err != nil {
b.Fatal(err)
}
}
})
b.StopTimer()
if err := cmd.Process.Kill(); err != nil {
b.Fatal(err)
}
})
for _, numProcess := range []int{1, 10, 100, 1000} {
b.Run("many process "+strconv.Itoa(numProcess), func(b *testing.B) {
cmds := make([]*exec.Cmd, numProcess)
for i := range cmds {
cmds[i] = createProcess()
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
pid := uint32(cmds[i%len(cmds)].Process.Pid)
if err := iterateChildThreads(pid, nop); err != nil {
b.Fatal(err)
}
}
b.StopTimer()
for _, cmd := range cmds {
if err := cmd.Process.Kill(); err != nil {
b.Fatal(err)
}
}
})
}
}