test/stress: start of a runtime stress program

Runs forever, stressing the runtime in various ways.

It should never terminate.

R=golang-dev, r, minux.ma
CC=golang-dev
https://golang.org/cl/8583047

test/stress/maps.go

+// Copyright 2013 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.
+
+package main
+
+import (
+	"math/rand"
+	"runtime"
+	"sync"
+)
+
+func mapTypes() []MapType {
+	// TODO(bradfitz): bunch more map types of all different key and value types.
+	// Use reflect.MapOf and a program to generate lots of types & struct types.
+	// For now, just one:
+	return []MapType{intMapType{}}
+}
+
+type MapType interface {
+	NewMap() Map
+}
+
+type Map interface {
+	AddItem()
+	DelItem()
+	Len() int
+	GetItem()
+	RangeAll()
+}
+
+func stressMapType(mt MapType, done func()) {
+	defer done()
+	m := mt.NewMap()
+	for m.Len() < 10000 {
+		Println("map at ", m.Len())
+		if m.Len()%100 == 0 {
+			runtime.Gosched()
+		}
+		m.AddItem()
+		m.AddItem()
+		m.DelItem()
+		var wg sync.WaitGroup
+		const numGets = 10
+		wg.Add(numGets)
+		for i := 0; i < numGets; i++ {
+			go func(i int) {
+				if i&1 == 0 {
+					m.GetItem()
+				} else {
+					m.RangeAll()
+				}
+				wg.Done()
+			}(i)
+		}
+		wg.Wait()
+	}
+	for m.Len() > 0 {
+		m.DelItem()
+	}
+}
+
+type intMapType struct{}
+
+func (intMapType) NewMap() Map {
+	return make(intMap)
+}
+
+var deadcafe = []byte("\xDE\xAD\xCA\xFE")
+
+type intMap map[int][]byte
+
+func (m intMap) AddItem() {
+	s0 := len(m)
+	for len(m) == s0 {
+		key := rand.Intn(s0 + 1)
+		m[key] = make([]byte, rand.Intn(64<<10))
+	}
+}
+
+func (m intMap) DelItem() {
+	for k := range m {
+		delete(m, k)
+		return
+	}
+}
+
+func (m intMap) GetItem() {
+	key := rand.Intn(len(m))
+	if s, ok := m[key]; ok {
+		copy(s, deadcafe)
+	}
+}
+
+func (m intMap) Len() int { return len(m) }
+
+func (m intMap) RangeAll() {
+	for _ = range m {
+	}
+}
+
+func stressMaps() {
+	for {
+		var wg sync.WaitGroup
+		for _, mt := range mapTypes() {
+			wg.Add(1)
+			go stressMapType(mt, wg.Done)
+		}
+		wg.Wait()
+	}
+}

test/stress/parsego.go

+// Copyright 2013 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.
+
+package main
+
+import (
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"path"
+	"runtime"
+	"strings"
+)
+
+func isGoFile(dir os.FileInfo) bool {
+	return !dir.IsDir() &&
+		!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(token.NewFileSet(), 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; it
+	// 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(token.NewFileSet(), dirpath, filter, parser.ParseComments)
+	if err != nil {
+		println("parse", dirpath, err.Error())
+		panic("go ParseDir fail: " + err.Error())
+	}
+	return pkgs
+}
+
+func stressParseGo() {
+	pkgroot := runtime.GOROOT() + "/src/pkg/"
+	for {
+		m := make(map[string]map[string]*ast.Package)
+		for _, pkg := range packages {
+			m[pkg] = parseDir(pkgroot + pkg)
+			Println("parsed go package", pkg)
+		}
+	}
+}
+
+// find . -type d -not -path "./exp" -not -path "./exp/*" -printf "\t\"%p\",\n" | sort | sed "s/\.\///" | grep -v testdata
+var packages = []string{
+	"archive",
+	"archive/tar",
+	"archive/zip",
+	"bufio",
+	"builtin",
+	"bytes",
+	"compress",
+	"compress/bzip2",
+	"compress/flate",
+	"compress/gzip",
+	"compress/lzw",
+	"compress/zlib",
+	"container",
+	"container/heap",
+	"container/list",
+	"container/ring",
+	"crypto",
+	"crypto/aes",
+	"crypto/cipher",
+	"crypto/des",
+	"crypto/dsa",
+	"crypto/ecdsa",
+	"crypto/elliptic",
+	"crypto/hmac",
+	"crypto/md5",
+	"crypto/rand",
+	"crypto/rc4",
+	"crypto/rsa",
+	"crypto/sha1",
+	"crypto/sha256",
+	"crypto/sha512",
+	"crypto/subtle",
+	"crypto/tls",
+	"crypto/x509",
+	"crypto/x509/pkix",
+	"database",
+	"database/sql",
+	"database/sql/driver",
+	"debug",
+	"debug/dwarf",
+	"debug/elf",
+	"debug/gosym",
+	"debug/macho",
+	"debug/pe",
+	"encoding",
+	"encoding/ascii85",
+	"encoding/asn1",
+	"encoding/base32",
+	"encoding/base64",
+	"encoding/binary",
+	"encoding/csv",
+	"encoding/gob",
+	"encoding/hex",
+	"encoding/json",
+	"encoding/pem",
+	"encoding/xml",
+	"errors",
+	"expvar",
+	"flag",
+	"fmt",
+	"go",
+	"go/ast",
+	"go/build",
+	"go/doc",
+	"go/format",
+	"go/parser",
+	"go/printer",
+	"go/scanner",
+	"go/token",
+	"hash",
+	"hash/adler32",
+	"hash/crc32",
+	"hash/crc64",
+	"hash/fnv",
+	"html",
+	"html/template",
+	"image",
+	"image/color",
+	"image/draw",
+	"image/gif",
+	"image/jpeg",
+	"image/png",
+	"index",
+	"index/suffixarray",
+	"io",
+	"io/ioutil",
+	"log",
+	"log/syslog",
+	"math",
+	"math/big",
+	"math/cmplx",
+	"math/rand",
+	"mime",
+	"mime/multipart",
+	"net",
+	"net/http",
+	"net/http/cgi",
+	"net/http/cookiejar",
+	"net/http/fcgi",
+	"net/http/httptest",
+	"net/http/httputil",
+	"net/http/pprof",
+	"net/mail",
+	"net/rpc",
+	"net/rpc/jsonrpc",
+	"net/smtp",
+	"net/textproto",
+	"net/url",
+	"os",
+	"os/exec",
+	"os/signal",
+	"os/user",
+	"path",
+	"path/filepath",
+	"reflect",
+	"regexp",
+	"regexp/syntax",
+	"runtime",
+	"runtime/cgo",
+	"runtime/debug",
+	"runtime/pprof",
+	"runtime/race",
+	"sort",
+	"strconv",
+	"strings",
+	"sync",
+	"sync/atomic",
+	"syscall",
+	"testing",
+	"testing/iotest",
+	"testing/quick",
+	"text",
+	"text/scanner",
+	"text/tabwriter",
+	"text/template",
+	"text/template/parse",
+	"time",
+	"unicode",
+	"unicode/utf16",
+	"unicode/utf8",
+	"unsafe",
+}

test/stress/runstress.go

+// Copyright 2013 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.
+
+// The runstress tool stresses the runtime.
+//
+// It runs forever and should never fail. It tries to stress the garbage collector,
+// maps, channels, the network, and everything else provided by the runtime.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"os/exec"
+	"strconv"
+	"time"
+)
+
+var (
+	v         = flag.Bool("v", false, "verbose")
+	doMaps    = flag.Bool("maps", true, "stress maps")
+	doExec    = flag.Bool("exec", true, "stress exec")
+	doChan    = flag.Bool("chan", true, "stress channels")
+	doNet     = flag.Bool("net", true, "stress networking")
+	doParseGo = flag.Bool("parsego", true, "stress parsing Go (generates garbage)")
+)
+
+func Println(a ...interface{}) {
+	if *v {
+		log.Println(a...)
+	}
+}
+
+func dialStress(a net.Addr) {
+	for {
+		d := net.Dialer{Timeout: time.Duration(rand.Intn(1e9))}
+		c, err := d.Dial("tcp", a.String())
+		if err == nil {
+			Println("did dial")
+			go func() {
+				time.Sleep(time.Duration(rand.Intn(500)) * time.Millisecond)
+				c.Close()
+				Println("closed dial")
+			}()
+		}
+		// Don't run out of ephermeral ports too quickly:
+		time.Sleep(250 * time.Millisecond)
+	}
+}
+
+func stressNet() {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		size, _ := strconv.Atoi(r.FormValue("size"))
+		w.Write(make([]byte, size))
+	}))
+	go dialStress(ts.Listener.Addr())
+	for {
+		size := rand.Intn(128 << 10)
+		res, err := http.Get(fmt.Sprintf("%s/?size=%d", ts.URL, size))
+		if err != nil {
+			log.Fatalf("stressNet: http Get error: %v", err)
+		}
+		if res.StatusCode != 200 {
+			log.Fatalf("stressNet: Status code = %d", res.StatusCode)
+		}
+		n, err := io.Copy(ioutil.Discard, res.Body)
+		if err != nil {
+			log.Fatalf("stressNet: io.Copy: %v", err)
+		}
+		if n != int64(size) {
+			log.Fatalf("stressNet: copied = %d; want %d", n, size)
+		}
+		res.Body.Close()
+		Println("did http", size)
+	}
+}
+
+func doAnExec() {
+	exit := rand.Intn(2)
+	wantOutput := fmt.Sprintf("output-%d", rand.Intn(1e9))
+	cmd := exec.Command("/bin/sh", "-c", fmt.Sprintf("echo %s; exit %d", wantOutput, exit))
+	out, err := cmd.CombinedOutput()
+	if exit == 1 {
+		if err == nil {
+			log.Fatal("stressExec: unexpected exec success")
+		}
+		return
+	}
+	if err != nil {
+		log.Fatalf("stressExec: exec failure: %v: %s", err, out)
+	}
+	wantOutput += "\n"
+	if string(out) != wantOutput {
+		log.Fatalf("stressExec: exec output = %q; want %q", out, wantOutput)
+	}
+	Println("did exec")
+}
+
+func stressExec() {
+	gate := make(chan bool, 10) // max execs at once
+	for {
+		gate <- true
+		go func() {
+			doAnExec()
+			<-gate
+		}()
+	}
+}
+
+func ringf(in <-chan int, out chan<- int, donec chan<- bool) {
+	for {
+		n := <-in
+		if n == 0 {
+			donec <- true
+			return
+		}
+		out <- n - 1
+	}
+}
+
+func threadRing(bufsize int) {
+	const N = 100
+	donec := make(chan bool)
+	one := make(chan int, bufsize) // will be input to thread 1
+	var in, out chan int = nil, one
+	for i := 1; i <= N-1; i++ {
+		in, out = out, make(chan int, bufsize)
+		go ringf(in, out, donec)
+	}
+	go ringf(out, one, donec)
+	one <- N
+	<-donec
+	Println("did threadring of", bufsize)
+}
+
+func stressChannels() {
+	for {
+		threadRing(0)
+		threadRing(1)
+	}
+}
+
+func main() {
+	flag.Parse()
+	for want, f := range map[*bool]func(){
+		doMaps:    stressMaps,
+		doNet:     stressNet,
+		doExec:    stressExec,
+		doChan:    stressChannels,
+		doParseGo: stressParseGo,
+	} {
+		if *want {
+			go f()
+		}
+	}
+	select {}
+}