361 lines
9.7 KiB
Go
361 lines
9.7 KiB
Go
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// Copyright 2015 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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// Compilebench benchmarks the speed of the Go compiler.
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//
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// Usage:
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//
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// compilebench [options]
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//
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// It times the compilation of various packages and prints results in
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// the format used by package testing (and expected by golang.org/x/perf/cmd/benchstat).
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//
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// The options are:
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//
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// -alloc
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// Report allocations.
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//
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// -compile exe
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// Use exe as the path to the cmd/compile binary.
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//
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// -compileflags 'list'
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// Pass the space-separated list of flags to the compilation.
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//
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// -count n
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// Run each benchmark n times (default 1).
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//
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// -cpuprofile file
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// Write a CPU profile of the compiler to file.
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//
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// -memprofile file
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// Write a memory profile of the compiler to file.
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//
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// -memprofilerate rate
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// Set runtime.MemProfileRate during compilation.
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//
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// -obj
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// Report object file statistics.
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//
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// -pkg
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// Benchmark compiling a single package.
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//
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// -run regexp
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// Only run benchmarks with names matching regexp.
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//
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// Although -cpuprofile and -memprofile are intended to write a
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// combined profile for all the executed benchmarks to file,
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// today they write only the profile for the last benchmark executed.
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//
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// The default memory profiling rate is one profile sample per 512 kB
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// allocated (see ``go doc runtime.MemProfileRate'').
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// Lowering the rate (for example, -memprofilerate 64000) produces
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// a more fine-grained and therefore accurate profile, but it also incurs
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// execution cost. For benchmark comparisons, never use timings
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// obtained with a low -memprofilerate option.
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//
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// Example
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//
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// Assuming the base version of the compiler has been saved with
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// ``toolstash save,'' this sequence compares the old and new compiler:
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//
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// compilebench -count 10 -compile $(toolstash -n compile) >old.txt
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// compilebench -count 10 >new.txt
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// benchstat old.txt new.txt
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//
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/build"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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var (
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goroot string
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compiler string
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runRE *regexp.Regexp
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is6g bool
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)
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var (
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flagGoCmd = flag.String("go", "go", "path to \"go\" command")
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flagAlloc = flag.Bool("alloc", false, "report allocations")
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flagObj = flag.Bool("obj", false, "report object file stats")
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flagCompiler = flag.String("compile", "", "use `exe` as the cmd/compile binary")
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flagCompilerFlags = flag.String("compileflags", "", "additional `flags` to pass to compile")
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flagRun = flag.String("run", "", "run benchmarks matching `regexp`")
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flagCount = flag.Int("count", 1, "run benchmarks `n` times")
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flagCpuprofile = flag.String("cpuprofile", "", "write CPU profile to `file`")
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flagMemprofile = flag.String("memprofile", "", "write memory profile to `file`")
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flagMemprofilerate = flag.Int64("memprofilerate", -1, "set memory profile `rate`")
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flagPackage = flag.String("pkg", "", "if set, benchmark the package at path `pkg`")
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flagShort = flag.Bool("short", false, "skip long-running benchmarks")
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)
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var tests = []struct {
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name string
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dir string
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long bool
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}{
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{"BenchmarkTemplate", "html/template", false},
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{"BenchmarkUnicode", "unicode", false},
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{"BenchmarkGoTypes", "go/types", false},
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{"BenchmarkCompiler", "cmd/compile/internal/gc", false},
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{"BenchmarkSSA", "cmd/compile/internal/ssa", false},
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{"BenchmarkFlate", "compress/flate", false},
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{"BenchmarkGoParser", "go/parser", false},
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{"BenchmarkReflect", "reflect", false},
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{"BenchmarkTar", "archive/tar", false},
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{"BenchmarkXML", "encoding/xml", false},
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{"BenchmarkStdCmd", "", true},
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{"BenchmarkHelloSize", "", false},
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{"BenchmarkCmdGoSize", "", true},
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}
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func usage() {
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fmt.Fprintf(os.Stderr, "usage: compilebench [options]\n")
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fmt.Fprintf(os.Stderr, "options:\n")
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flag.PrintDefaults()
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os.Exit(2)
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}
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func main() {
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log.SetFlags(0)
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log.SetPrefix("compilebench: ")
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flag.Usage = usage
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flag.Parse()
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if flag.NArg() != 0 {
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usage()
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}
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s, err := exec.Command(*flagGoCmd, "env", "GOROOT").CombinedOutput()
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if err != nil {
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log.Fatalf("%s env GOROOT: %v", *flagGoCmd, err)
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}
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goroot = strings.TrimSpace(string(s))
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compiler = *flagCompiler
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if compiler == "" {
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out, err := exec.Command(*flagGoCmd, "tool", "-n", "compile").CombinedOutput()
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if err != nil {
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out, err = exec.Command(*flagGoCmd, "tool", "-n", "6g").CombinedOutput()
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is6g = true
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if err != nil {
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out, err = exec.Command(*flagGoCmd, "tool", "-n", "compile").CombinedOutput()
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log.Fatalf("go tool -n compiler: %v\n%s", err, out)
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}
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}
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compiler = strings.TrimSpace(string(out))
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}
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if *flagRun != "" {
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r, err := regexp.Compile(*flagRun)
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if err != nil {
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log.Fatalf("invalid -run argument: %v", err)
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}
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runRE = r
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}
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for i := 0; i < *flagCount; i++ {
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if *flagPackage != "" {
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runBuild("BenchmarkPkg", *flagPackage, i)
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continue
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}
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for _, tt := range tests {
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if tt.long && *flagShort {
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continue
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}
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if runRE == nil || runRE.MatchString(tt.name) {
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runBuild(tt.name, tt.dir, i)
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}
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}
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}
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}
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func runCmd(name string, cmd *exec.Cmd) {
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start := time.Now()
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out, err := cmd.CombinedOutput()
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if err != nil {
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log.Printf("%v: %v\n%s", name, err, out)
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return
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}
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fmt.Printf("%s 1 %d ns/op\n", name, time.Since(start).Nanoseconds())
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}
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func runStdCmd() {
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args := []string{"build", "-a"}
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if *flagCompilerFlags != "" {
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args = append(args, "-gcflags", *flagCompilerFlags)
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}
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args = append(args, "std", "cmd")
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cmd := exec.Command(*flagGoCmd, args...)
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cmd.Dir = filepath.Join(goroot, "src")
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runCmd("BenchmarkStdCmd", cmd)
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}
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// path is either a path to a file ("$GOROOT/test/helloworld.go") or a package path ("cmd/go").
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func runSize(name, path string) {
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cmd := exec.Command(*flagGoCmd, "build", "-o", "_compilebenchout_", path)
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cmd.Stdout = os.Stderr
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cmd.Stderr = os.Stderr
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if err := cmd.Run(); err != nil {
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log.Print(err)
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return
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}
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defer os.Remove("_compilebenchout_")
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info, err := os.Stat("_compilebenchout_")
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if err != nil {
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log.Print(err)
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return
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}
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out, err := exec.Command("size", "_compilebenchout_").CombinedOutput()
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if err != nil {
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log.Printf("size: %v\n%s", err, out)
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return
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}
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lines := strings.Split(string(out), "\n")
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if len(lines) < 2 {
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log.Printf("not enough output from size: %s", out)
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return
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}
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f := strings.Fields(lines[1])
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if strings.HasPrefix(lines[0], "__TEXT") && len(f) >= 2 { // OS X
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fmt.Printf("%s 1 %s text-bytes %s data-bytes %v exe-bytes\n", name, f[0], f[1], info.Size())
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} else if strings.Contains(lines[0], "bss") && len(f) >= 3 {
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fmt.Printf("%s 1 %s text-bytes %s data-bytes %s bss-bytes %v exe-bytes\n", name, f[0], f[1], f[2], info.Size())
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}
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}
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func runBuild(name, dir string, count int) {
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switch name {
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case "BenchmarkStdCmd":
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runStdCmd()
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return
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case "BenchmarkCmdGoSize":
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runSize("BenchmarkCmdGoSize", "cmd/go")
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return
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case "BenchmarkHelloSize":
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runSize("BenchmarkHelloSize", filepath.Join(goroot, "test/helloworld.go"))
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return
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}
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pkg, err := build.Import(dir, ".", 0)
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if err != nil {
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log.Print(err)
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return
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}
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args := []string{"-o", "_compilebench_.o"}
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if is6g {
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*flagMemprofilerate = -1
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*flagAlloc = false
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*flagCpuprofile = ""
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*flagMemprofile = ""
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}
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if *flagMemprofilerate >= 0 {
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args = append(args, "-memprofilerate", fmt.Sprint(*flagMemprofilerate))
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}
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args = append(args, strings.Fields(*flagCompilerFlags)...)
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if *flagAlloc || *flagCpuprofile != "" || *flagMemprofile != "" {
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if *flagAlloc || *flagMemprofile != "" {
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args = append(args, "-memprofile", "_compilebench_.memprof")
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}
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if *flagCpuprofile != "" {
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args = append(args, "-cpuprofile", "_compilebench_.cpuprof")
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}
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}
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args = append(args, pkg.GoFiles...)
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cmd := exec.Command(compiler, args...)
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cmd.Dir = pkg.Dir
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cmd.Stdout = os.Stderr
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cmd.Stderr = os.Stderr
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start := time.Now()
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err = cmd.Run()
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if err != nil {
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log.Printf("%v: %v", name, err)
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return
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}
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end := time.Now()
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var allocs, allocbytes int64
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if *flagAlloc || *flagMemprofile != "" {
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out, err := ioutil.ReadFile(pkg.Dir + "/_compilebench_.memprof")
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if err != nil {
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log.Print("cannot find memory profile after compilation")
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}
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for _, line := range strings.Split(string(out), "\n") {
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f := strings.Fields(line)
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if len(f) < 4 || f[0] != "#" || f[2] != "=" {
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continue
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}
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val, err := strconv.ParseInt(f[3], 0, 64)
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if err != nil {
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continue
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}
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switch f[1] {
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case "TotalAlloc":
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allocbytes = val
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case "Mallocs":
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allocs = val
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}
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}
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if *flagMemprofile != "" {
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if err := ioutil.WriteFile(*flagMemprofile, out, 0666); err != nil {
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log.Print(err)
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}
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}
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os.Remove(pkg.Dir + "/_compilebench_.memprof")
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}
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if *flagCpuprofile != "" {
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out, err := ioutil.ReadFile(pkg.Dir + "/_compilebench_.cpuprof")
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if err != nil {
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log.Print(err)
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}
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outpath := *flagCpuprofile
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if *flagCount != 1 {
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outpath = fmt.Sprintf("%s_%d", outpath, count)
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}
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if err := ioutil.WriteFile(outpath, out, 0666); err != nil {
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log.Print(err)
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}
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os.Remove(pkg.Dir + "/_compilebench_.cpuprof")
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}
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wallns := end.Sub(start).Nanoseconds()
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userns := cmd.ProcessState.UserTime().Nanoseconds()
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fmt.Printf("%s 1 %d ns/op %d user-ns/op", name, wallns, userns)
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if *flagAlloc {
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fmt.Printf(" %d B/op %d allocs/op", allocbytes, allocs)
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}
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opath := pkg.Dir + "/_compilebench_.o"
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if *flagObj {
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// TODO(josharian): object files are big; just read enough to find what we seek.
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data, err := ioutil.ReadFile(opath)
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if err != nil {
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log.Print(err)
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}
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// Find start of export data.
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i := bytes.Index(data, []byte("\n$$B\n")) + len("\n$$B\n")
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// Count bytes to end of export data.
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nexport := bytes.Index(data[i:], []byte("\n$$\n"))
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fmt.Printf(" %d object-bytes %d export-bytes", len(data), nexport)
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}
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fmt.Println()
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os.Remove(opath)
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}
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