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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Garbage collection benchmark: parse Go packages repeatedly.
package main
import (
"flag"
"fmt"
"go/ast"
"go/parser"
"os"
"path"
"runtime"
"strings"
"time"
)
func isGoFile(dir *os.FileInfo) bool {
return dir.IsRegular() &&
!strings.HasPrefix(dir.Name, ".") && // ignore .files
path.Ext(dir.Name) == ".go"
}
func isPkgFile(dir *os.FileInfo) bool {
return isGoFile(dir) &&
!strings.HasSuffix(dir.Name, "_test.go") // ignore test files
}
func pkgName(filename string) string {
file, err := parser.ParseFile(filename, nil, parser.PackageClauseOnly)
if err != nil || file == nil {
return ""
}
return file.Name.Name
}
func parseDir(dirpath string) map[string]*ast.Package {
// the package name is the directory name within its parent
// (use dirname instead of path because dirname is clean; i.e. has no trailing '/')
_, pkgname := path.Split(dirpath)
// filter function to select the desired .go files
filter := func(d *os.FileInfo) bool {
if isPkgFile(d) {
// Some directories contain main packages: Only accept
// files that belong to the expected package so that
// parser.ParsePackage doesn't return "multiple packages
// found" errors.
// Additionally, accept the special package name
// fakePkgName if we are looking at cmd documentation.
name := pkgName(dirpath + "/" + d.Name)
return name == pkgname
}
return false
}
// get package AST
pkgs, err := parser.ParseDir(dirpath, filter, parser.ParseComments)
if err != nil {
println("parse", dirpath, err.String())
panic("fail")
}
return pkgs
}
func main() {
st := &runtime.MemStats
n := flag.Int("n", 4, "iterations")
p := flag.Int("p", len(packages), "# of packages to keep in memory")
flag.BoolVar(&st.DebugGC, "d", st.DebugGC, "print GC debugging info (pause times)")
flag.Parse()
var t0 int64
pkgroot := runtime.GOROOT() + "/src/pkg/"
for pass := 0; pass < 2; pass++ {
// Once the heap is grown to full size, reset counters.
// This hides the start-up pauses, which are much smaller
// than the normal pauses and would otherwise make
// the average look much better than it actually is.
st.NumGC = 0
st.PauseNs = 0
t0 = time.Nanoseconds()
for i := 0; i < *n; i++ {
parsed := make([]map[string]*ast.Package, *p)
for j := range parsed {
parsed[j] = parseDir(pkgroot + packages[j%len(packages)])
}
}
runtime.GC()
}
t1 := time.Nanoseconds()
fmt.Printf("Alloc=%d/%d Heap=%d Mallocs=%d PauseTime=%.3f/%d = %.3f\n",
st.Alloc, st.TotalAlloc,
st.Sys,
st.Mallocs, float64(st.PauseNs)/1e9,
st.NumGC, float64(st.PauseNs)/1e9/float64(st.NumGC))
fmt.Printf("%10s %10s %10s\n", "size", "#alloc", "#free")
for _, s := range st.BySize {
fmt.Printf("%10d %10d %10d\n", s.Size, s.Mallocs, s.Frees)
}
// Standard gotest benchmark output, collected by build dashboard.
fmt.Printf("garbage.BenchmarkParser %d %d ns/op\n", *n, (t1-t0)/int64(*n))
fmt.Printf("garbage.BenchmarkParserPause %d %d ns/op\n", st.NumGC, int64(st.PauseNs)/int64(st.NumGC))
}
var packages = []string{
"archive/tar",
"asn1",
"big",
"bufio",
"bytes",
"cmath",
"compress/flate",
"compress/gzip",
"compress/zlib",
"container/heap",
"container/list",
"container/ring",
"container/vector",
"crypto/aes",
"crypto/block",
"crypto/blowfish",
"crypto/hmac",
"crypto/md4",
"crypto/md5",
"crypto/rand",
"crypto/rc4",
"crypto/rsa",
"crypto/sha1",
"crypto/sha256",
"crypto/sha512",
"crypto/subtle",
"crypto/tls",
"crypto/x509",
"crypto/xtea",
"debug/dwarf",
"debug/macho",
"debug/elf",
"debug/gosym",
"debug/proc",
"ebnf",
"encoding/ascii85",
"encoding/base64",
"encoding/binary",
"encoding/git85",
"encoding/hex",
"encoding/pem",
"exec",
"exp/datafmt",
"exp/draw",
"exp/eval",
"exp/iterable",
"expvar",
"flag",
"fmt",
"go/ast",
"go/doc",
"go/parser",
"go/printer",
"go/scanner",
"go/token",
"gob",
"hash",
"hash/adler32",
"hash/crc32",
"hash/crc64",
"http",
"image",
"image/jpeg",
"image/png",
"io",
"io/ioutil",
"json",
"log",
"math",
"mime",
"net",
"nntp",
"os",
"os/signal",
"patch",
"path",
"rand",
"reflect",
"regexp",
"rpc",
"runtime",
"scanner",
"sort",
"strconv",
"strings",
"sync",
"syscall",
"syslog",
"tabwriter",
"template",
"testing",
"testing/iotest",
"testing/quick",
"testing/script",
"time",
"unicode",
"utf8",
"utf16",
"websocket",
"xml",
}
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