130 lines
2.5 KiB
Go
130 lines
2.5 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"runtime"
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"runtime/trace"
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"sync"
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"syscall"
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"time"
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)
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func main() {
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if err := trace.Start(os.Stdout); err != nil {
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log.Fatal(err)
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}
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// checkExecutionTimes relies on this.
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var wg sync.WaitGroup
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wg.Add(2)
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go cpu10(&wg)
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go cpu20(&wg)
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wg.Wait()
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// checkHeapMetrics relies on this.
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allocHog(25 * time.Millisecond)
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// checkProcStartStop relies on this.
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var wg2 sync.WaitGroup
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for i := 0; i < runtime.GOMAXPROCS(0); i++ {
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wg2.Add(1)
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go func() {
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defer wg2.Done()
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cpuHog(50 * time.Millisecond)
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}()
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}
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wg2.Wait()
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// checkSyscalls relies on this.
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done := make(chan error)
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go blockingSyscall(50*time.Millisecond, done)
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if err := <-done; err != nil {
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log.Fatal(err)
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}
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// checkNetworkUnblock relies on this.
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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log.Fatalf("listen failed: %v", err)
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}
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defer ln.Close()
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go func() {
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c, err := ln.Accept()
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if err != nil {
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return
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}
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time.Sleep(time.Millisecond)
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var buf [1]byte
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c.Write(buf[:])
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c.Close()
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}()
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c, err := net.Dial("tcp", ln.Addr().String())
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if err != nil {
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log.Fatalf("dial failed: %v", err)
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}
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var tmp [1]byte
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c.Read(tmp[:])
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c.Close()
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trace.Stop()
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}
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// blockingSyscall blocks the current goroutine for duration d in a syscall and
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// sends a message to done when it is done or if the syscall failed.
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func blockingSyscall(d time.Duration, done chan<- error) {
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r, w, err := os.Pipe()
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if err != nil {
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done <- err
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return
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}
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start := time.Now()
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msg := []byte("hello")
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time.AfterFunc(d, func() { w.Write(msg) })
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_, err = syscall.Read(int(r.Fd()), make([]byte, len(msg)))
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if err == nil && time.Since(start) < d {
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err = fmt.Errorf("syscall returned too early: want=%s got=%s", d, time.Since(start))
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}
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done <- err
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}
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func cpu10(wg *sync.WaitGroup) {
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defer wg.Done()
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cpuHog(10 * time.Millisecond)
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}
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func cpu20(wg *sync.WaitGroup) {
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defer wg.Done()
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cpuHog(20 * time.Millisecond)
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}
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func cpuHog(dt time.Duration) {
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start := time.Now()
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for i := 0; ; i++ {
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if i%1000 == 0 && time.Since(start) > dt {
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return
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}
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}
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}
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func allocHog(dt time.Duration) {
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start := time.Now()
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var s [][]byte
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for i := 0; ; i++ {
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if i%1000 == 0 {
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if time.Since(start) > dt {
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return
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}
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// Take a break... this will generate a ton of events otherwise.
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time.Sleep(50 * time.Microsecond)
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}
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s = append(s, make([]byte, 1024))
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}
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}
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