mirror of
https://github.com/golang/go
synced 2024-11-21 23:54:40 -07:00
pprof: add Profile type
Makes it possible for client code to maintain its own profiles, and also reduces the API surface by giving us a type that models built-in profiles. R=golang-dev, r CC=golang-dev https://golang.org/cl/5684056
This commit is contained in:
Russ Cox
parent
e4b02bfdc0
commit
ebae73bb24
@ -22,9 +22,9 @@
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//
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// go tool pprof http://localhost:6060/debug/pprof/profile
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//
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// Or to look at the thread creation profile:
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// Or to view all available profiles:
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//
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// go tool pprof http://localhost:6060/debug/pprof/thread
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// go tool pprof http://localhost:6060/debug/pprof/
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//
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// For a study of the facility in action, visit
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//
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@ -36,7 +36,9 @@ import (
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"bufio"
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"bytes"
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"fmt"
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"html/template"
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"io"
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"log"
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"net/http"
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"os"
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"runtime"
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@ -47,11 +49,10 @@ import (
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)
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func init() {
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http.Handle("/debug/pprof/", http.HandlerFunc(Index))
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http.Handle("/debug/pprof/cmdline", http.HandlerFunc(Cmdline))
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http.Handle("/debug/pprof/profile", http.HandlerFunc(Profile))
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http.Handle("/debug/pprof/heap", http.HandlerFunc(Heap))
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http.Handle("/debug/pprof/symbol", http.HandlerFunc(Symbol))
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http.Handle("/debug/pprof/thread", http.HandlerFunc(Thread))
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}
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// Cmdline responds with the running program's
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@ -62,20 +63,6 @@ func Cmdline(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, strings.Join(os.Args, "\x00"))
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}
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// Heap responds with the pprof-formatted heap profile.
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// The package initialization registers it as /debug/pprof/heap.
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func Heap(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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pprof.WriteHeapProfile(w)
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}
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// Thread responds with the pprof-formatted thread creation profile.
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// The package initialization registers it as /debug/pprof/thread.
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func Thread(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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pprof.WriteThreadProfile(w)
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}
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// Profile responds with the pprof-formatted cpu profile.
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// The package initialization registers it as /debug/pprof/profile.
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func Profile(w http.ResponseWriter, r *http.Request) {
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@ -147,3 +134,61 @@ func Symbol(w http.ResponseWriter, r *http.Request) {
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w.Write(buf.Bytes())
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}
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// Handler returns an HTTP handler that serves the named profile.
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func Handler(name string) http.Handler {
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return handler(name)
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}
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type handler string
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func (name handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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debug, _ := strconv.Atoi(r.FormValue("debug"))
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p := pprof.Lookup(string(name))
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if p == nil {
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w.WriteHeader(404)
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fmt.Fprintf(w, "Unknown profile: %s\n", name)
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return
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}
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p.WriteTo(w, debug)
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return
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}
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// Index responds with the pprof-formatted profile named by the request.
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// For example, "/debug/pprof/heap" serves the "heap" profile.
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// Index responds to a request for "/debug/pprof/" with an HTML page
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// listing the available profiles.
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func Index(w http.ResponseWriter, r *http.Request) {
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if strings.HasPrefix(r.URL.Path, "/debug/pprof/") {
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name := r.URL.Path[len("/debug/pprof/"):]
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if name != "" {
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handler(name).ServeHTTP(w, r)
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return
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}
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}
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profiles := pprof.Profiles()
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if err := indexTmpl.Execute(w, profiles); err != nil {
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log.Print(err)
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}
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}
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var indexTmpl = template.Must(template.New("index").Parse(`<html>
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<head>
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<title>/debug/pprof/</title>
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</head>
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/debug/pprof/<br>
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<br>
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<body>
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profiles:<br>
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<table>
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{{range .}}
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<tr><td align=right>{{.Count}}<td><a href="/debug/pprof/{{.Name}}?debug=1">{{.Name}}</a>
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{{end}}
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</table>
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<br>
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<a href="/debug/pprof/goroutine?debug=2">full goroutine stack dump</a><br>
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</body>
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</html>
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`))
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@ -10,19 +10,354 @@ package pprof
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"runtime"
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"sort"
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"strings"
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"sync"
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"text/tabwriter"
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)
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// BUG(rsc): CPU profiling is broken on OS X, due to an Apple kernel bug.
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// For details, see http://code.google.com/p/go/source/detail?r=35b716c94225.
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// WriteHeapProfile writes a pprof-formatted heap profile to w.
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// If a write to w returns an error, WriteHeapProfile returns that error.
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// Otherwise, WriteHeapProfile returns nil.
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// A Profile is a collection of stack traces showing the call sequences
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// that led to instances of a particular event, such as allocation.
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// Packages can create and maintain their own profiles; the most common
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// use is for tracking resources that must be explicitly closed, such as files
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// or network connections.
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//
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// A Profile's methods can be called from multiple goroutines simultaneously.
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//
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// Each Profile has a unique name. A few profiles are predefined:
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//
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// goroutine - stack traces of all current goroutines
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// heap - a sampling of all heap allocations
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// threadcreate - stack traces that led to the creation of new OS threads
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//
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// These predefine profiles maintain themselves and panic on an explicit
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// Add or Remove method call.
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//
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// The CPU profile is not available as a Profile. It has a special API,
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// the StartCPUProfile and StopCPUProfile functions, because it streams
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// output to a writer during profiling.
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//
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type Profile struct {
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name string
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mu sync.Mutex
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m map[interface{}][]uintptr
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count func() int
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write func(io.Writer, int) error
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}
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// profiles records all registered profiles.
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var profiles struct {
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mu sync.Mutex
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m map[string]*Profile
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}
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var goroutineProfile = &Profile{
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name: "goroutine",
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count: countGoroutine,
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write: writeGoroutine,
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}
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var threadcreateProfile = &Profile{
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name: "threadcreate",
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count: countThreadCreate,
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write: writeThreadCreate,
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}
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var heapProfile = &Profile{
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name: "heap",
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count: countHeap,
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write: writeHeap,
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}
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func lockProfiles() {
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profiles.mu.Lock()
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if profiles.m == nil {
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// Initial built-in profiles.
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profiles.m = map[string]*Profile{
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"goroutine": goroutineProfile,
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"threadcreate": threadcreateProfile,
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"heap": heapProfile,
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}
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}
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}
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func unlockProfiles() {
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profiles.mu.Unlock()
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}
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// NewProfile creates a new profile with the given name.
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// If a profile with that name already exists, NewProfile panics.
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// The convention is to use a 'import/path.' prefix to create
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// separate name spaces for each package.
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func NewProfile(name string) *Profile {
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lockProfiles()
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defer unlockProfiles()
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if name == "" {
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panic("pprof: NewProfile with empty name")
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}
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if profiles.m[name] != nil {
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panic("pprof: NewProfile name already in use: " + name)
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}
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p := &Profile{
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name: name,
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m: map[interface{}][]uintptr{},
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}
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profiles.m[name] = p
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return p
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}
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// Lookup returns the profile with the given name, or nil if no such profile exists.
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func Lookup(name string) *Profile {
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lockProfiles()
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defer unlockProfiles()
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return profiles.m[name]
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}
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// Profiles returns a slice of all the known profiles, sorted by name.
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func Profiles() []*Profile {
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lockProfiles()
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defer unlockProfiles()
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var all []*Profile
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for _, p := range profiles.m {
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all = append(all, p)
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}
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sort.Sort(byName(all))
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return all
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}
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type byName []*Profile
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func (x byName) Len() int { return len(x) }
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func (x byName) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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func (x byName) Less(i, j int) bool { return x[i].name < x[j].name }
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// Name returns this profile's name, which can be passed to Lookup to reobtain the profile.
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func (p *Profile) Name() string {
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return p.name
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}
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// Count returns the number of execution stacks currently in the profile.
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func (p *Profile) Count() int {
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p.mu.Lock()
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defer p.mu.Unlock()
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if p.count != nil {
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return p.count()
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}
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return len(p.m)
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}
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// Add adds the current execution stack to the profile, associated with value.
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// Add stores value in an internal map, so value must be suitable for use as
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// a map key and will not be garbage collected until the corresponding
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// call to Remove. Add panics if the profile already contains a stack for value.
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//
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// The skip parameter has the same meaning as runtime.Caller's skip
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// and controls where the stack trace begins. Passing skip=0 begins the
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// trace in the function calling Add. For example, given this
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// execution stack:
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//
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// Add
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// called from rpc.NewClient
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// called from mypkg.Run
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// called from main.main
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//
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// Passing skip=0 begins the stack trace at the call to Add inside rpc.NewClient.
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// Passing skip=1 begins the stack trace at the call to NewClient inside mypkg.Run.
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//
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func (p *Profile) Add(value interface{}, skip int) {
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if p.name == "" {
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panic("pprof: use of uninitialized Profile")
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}
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if p.write != nil {
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panic("pprof: Add called on built-in Profile " + p.name)
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}
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stk := make([]uintptr, 32)
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n := runtime.Callers(skip+1, stk[:])
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p.mu.Lock()
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defer p.mu.Unlock()
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if p.m[value] != nil {
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panic("pprof: Profile.Add of duplicate value")
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}
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p.m[value] = stk[:n]
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}
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// Remove removes the execution stack associated with value from the profile.
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// It is a no-op if the value is not in the profile.
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func (p *Profile) Remove(value interface{}) {
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p.mu.Lock()
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defer p.mu.Unlock()
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delete(p.m, value)
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}
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// WriteTo writes a pprof-formatted snapshot of the profile to w.
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// If a write to w returns an error, WriteTo returns that error.
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// Otherwise, WriteTo returns nil.
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//
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// The debug parameter enables additional output.
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// Passing debug=0 prints only the hexadecimal addresses that pprof needs.
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// Passing debug=1 adds comments translating addresses to function names
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// and line numbers, so that a programmer can read the profile without tools.
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//
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// The predefined profiles may assign meaning to other debug values;
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// for example, when printing the "goroutine" profile, debug=2 means to
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// print the goroutine stacks in the same form that a Go program uses
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// when dying due to an unrecovered panic.
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func (p *Profile) WriteTo(w io.Writer, debug int) error {
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if p.name == "" {
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panic("pprof: use of zero Profile")
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}
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if p.write != nil {
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return p.write(w, debug)
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}
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// Obtain consistent snapshot under lock; then process without lock.
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var all [][]uintptr
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p.mu.Lock()
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for _, stk := range p.m {
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all = append(all, stk)
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}
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p.mu.Unlock()
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// Map order is non-deterministic; make output deterministic.
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sort.Sort(stackProfile(all))
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return printCountProfile(w, debug, p.name, stackProfile(all))
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}
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type stackProfile [][]uintptr
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func (x stackProfile) Len() int { return len(x) }
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func (x stackProfile) Stack(i int) []uintptr { return x[i] }
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func (x stackProfile) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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func (x stackProfile) Less(i, j int) bool {
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t, u := x[i], x[j]
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for k := 0; k < len(t) && k < len(u); k++ {
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if t[k] != u[k] {
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return t[k] < u[k]
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}
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}
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return len(t) < len(u)
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}
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// A countProfile is a set of stack traces to be printed as counts
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// grouped by stack trace. There are multiple implementations:
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// all that matters is that we can find out how many traces there are
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// and obtain each trace in turn.
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type countProfile interface {
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Len() int
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Stack(i int) []uintptr
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}
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// printCountProfile prints a countProfile at the specified debug level.
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func printCountProfile(w io.Writer, debug int, name string, p countProfile) error {
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b := bufio.NewWriter(w)
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var tw *tabwriter.Writer
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w = b
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if debug > 0 {
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tw = tabwriter.NewWriter(w, 1, 8, 1, '\t', 0)
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w = tw
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}
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fmt.Fprintf(w, "%s profile: total %d\n", name, p.Len())
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// Build count of each stack.
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var buf bytes.Buffer
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key := func(stk []uintptr) string {
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buf.Reset()
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fmt.Fprintf(&buf, "@")
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for _, pc := range stk {
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fmt.Fprintf(&buf, " %#x", pc)
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}
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return buf.String()
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}
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m := map[string]int{}
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n := p.Len()
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for i := 0; i < n; i++ {
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m[key(p.Stack(i))]++
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}
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// Print stacks, listing count on first occurrence of a unique stack.
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for i := 0; i < n; i++ {
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stk := p.Stack(i)
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s := key(stk)
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if count := m[s]; count != 0 {
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fmt.Fprintf(w, "%d %s\n", count, s)
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if debug > 0 {
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printStackRecord(w, stk, false)
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}
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delete(m, s)
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}
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}
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if tw != nil {
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tw.Flush()
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}
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return b.Flush()
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}
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// printStackRecord prints the function + source line information
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// for a single stack trace.
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func printStackRecord(w io.Writer, stk []uintptr, allFrames bool) {
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show := allFrames
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for _, pc := range stk {
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f := runtime.FuncForPC(pc)
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if f == nil {
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show = true
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fmt.Fprintf(w, "#\t%#x\n", pc)
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} else {
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file, line := f.FileLine(pc)
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name := f.Name()
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// Hide runtime.goexit and any runtime functions at the beginning.
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// This is useful mainly for allocation traces.
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if name == "runtime.goexit" || !show && strings.HasPrefix(name, "runtime.") {
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continue
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}
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show = true
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fmt.Fprintf(w, "#\t%#x\t%s+%#x\t%s:%d\n", pc, f.Name(), pc-f.Entry(), file, line)
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}
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}
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if !show {
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// We didn't print anything; do it again,
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// and this time include runtime functions.
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printStackRecord(w, stk, true)
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return
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}
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fmt.Fprintf(w, "\n")
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}
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// Interface to system profiles.
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type byInUseBytes []runtime.MemProfileRecord
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func (x byInUseBytes) Len() int { return len(x) }
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func (x byInUseBytes) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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func (x byInUseBytes) Less(i, j int) bool { return x[i].InUseBytes() > x[j].InUseBytes() }
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// WriteHeapProfile is shorthand for Lookup("heap").WriteTo(w, 0).
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// It is preserved for backwards compatibility.
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func WriteHeapProfile(w io.Writer) error {
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return writeHeap(w, 0)
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}
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// countHeap returns the number of records in the heap profile.
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func countHeap() int {
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n, _ := runtime.MemProfile(nil, false)
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return n
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}
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// writeHeapProfile writes the current runtime heap profile to w.
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func writeHeap(w io.Writer, debug int) error {
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// Find out how many records there are (MemProfile(nil, false)),
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// allocate that many records, and get the data.
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// There's a race—more records might be added between
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@ -44,6 +379,16 @@ func WriteHeapProfile(w io.Writer) error {
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// Profile grew; try again.
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}
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|
||||
sort.Sort(byInUseBytes(p))
|
||||
|
||||
b := bufio.NewWriter(w)
|
||||
var tw *tabwriter.Writer
|
||||
w = b
|
||||
if debug > 0 {
|
||||
tw = tabwriter.NewWriter(w, 1, 8, 1, '\t', 0)
|
||||
w = tw
|
||||
}
|
||||
|
||||
var total runtime.MemProfileRecord
|
||||
for i := range p {
|
||||
r := &p[i]
|
||||
@ -56,78 +401,120 @@ func WriteHeapProfile(w io.Writer) error {
|
||||
// Technically the rate is MemProfileRate not 2*MemProfileRate,
|
||||
// but early versions of the C++ heap profiler reported 2*MemProfileRate,
|
||||
// so that's what pprof has come to expect.
|
||||
b := bufio.NewWriter(w)
|
||||
fmt.Fprintf(b, "heap profile: %d: %d [%d: %d] @ heap/%d\n",
|
||||
fmt.Fprintf(w, "heap profile: %d: %d [%d: %d] @ heap/%d\n",
|
||||
total.InUseObjects(), total.InUseBytes(),
|
||||
total.AllocObjects, total.AllocBytes,
|
||||
2*runtime.MemProfileRate)
|
||||
|
||||
for i := range p {
|
||||
r := &p[i]
|
||||
fmt.Fprintf(b, "%d: %d [%d: %d] @",
|
||||
fmt.Fprintf(w, "%d: %d [%d: %d] @",
|
||||
r.InUseObjects(), r.InUseBytes(),
|
||||
r.AllocObjects, r.AllocBytes)
|
||||
for _, pc := range r.Stack() {
|
||||
fmt.Fprintf(b, " %#x", pc)
|
||||
fmt.Fprintf(w, " %#x", pc)
|
||||
}
|
||||
fmt.Fprintf(w, "\n")
|
||||
if debug > 0 {
|
||||
printStackRecord(w, r.Stack(), false)
|
||||
}
|
||||
fmt.Fprintf(b, "\n")
|
||||
}
|
||||
|
||||
// Print memstats information too.
|
||||
// Pprof will ignore, but useful for people.
|
||||
s := new(runtime.MemStats)
|
||||
runtime.ReadMemStats(s)
|
||||
fmt.Fprintf(b, "\n# runtime.MemStats\n")
|
||||
fmt.Fprintf(b, "# Alloc = %d\n", s.Alloc)
|
||||
fmt.Fprintf(b, "# TotalAlloc = %d\n", s.TotalAlloc)
|
||||
fmt.Fprintf(b, "# Sys = %d\n", s.Sys)
|
||||
fmt.Fprintf(b, "# Lookups = %d\n", s.Lookups)
|
||||
fmt.Fprintf(b, "# Mallocs = %d\n", s.Mallocs)
|
||||
// Pprof will ignore, but useful for people
|
||||
if debug > 0 {
|
||||
s := new(runtime.MemStats)
|
||||
runtime.ReadMemStats(s)
|
||||
fmt.Fprintf(w, "\n# runtime.MemStats\n")
|
||||
fmt.Fprintf(w, "# Alloc = %d\n", s.Alloc)
|
||||
fmt.Fprintf(w, "# TotalAlloc = %d\n", s.TotalAlloc)
|
||||
fmt.Fprintf(w, "# Sys = %d\n", s.Sys)
|
||||
fmt.Fprintf(w, "# Lookups = %d\n", s.Lookups)
|
||||
fmt.Fprintf(w, "# Mallocs = %d\n", s.Mallocs)
|
||||
|
||||
fmt.Fprintf(b, "# HeapAlloc = %d\n", s.HeapAlloc)
|
||||
fmt.Fprintf(b, "# HeapSys = %d\n", s.HeapSys)
|
||||
fmt.Fprintf(b, "# HeapIdle = %d\n", s.HeapIdle)
|
||||
fmt.Fprintf(b, "# HeapInuse = %d\n", s.HeapInuse)
|
||||
fmt.Fprintf(w, "# HeapAlloc = %d\n", s.HeapAlloc)
|
||||
fmt.Fprintf(w, "# HeapSys = %d\n", s.HeapSys)
|
||||
fmt.Fprintf(w, "# HeapIdle = %d\n", s.HeapIdle)
|
||||
fmt.Fprintf(w, "# HeapInuse = %d\n", s.HeapInuse)
|
||||
|
||||
fmt.Fprintf(b, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
|
||||
fmt.Fprintf(b, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
|
||||
fmt.Fprintf(b, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)
|
||||
fmt.Fprintf(b, "# BuckHashSys = %d\n", s.BuckHashSys)
|
||||
fmt.Fprintf(w, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
|
||||
fmt.Fprintf(w, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
|
||||
fmt.Fprintf(w, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)
|
||||
fmt.Fprintf(w, "# BuckHashSys = %d\n", s.BuckHashSys)
|
||||
|
||||
fmt.Fprintf(b, "# NextGC = %d\n", s.NextGC)
|
||||
fmt.Fprintf(b, "# PauseNs = %d\n", s.PauseNs)
|
||||
fmt.Fprintf(b, "# NumGC = %d\n", s.NumGC)
|
||||
fmt.Fprintf(b, "# EnableGC = %v\n", s.EnableGC)
|
||||
fmt.Fprintf(b, "# DebugGC = %v\n", s.DebugGC)
|
||||
fmt.Fprintf(w, "# NextGC = %d\n", s.NextGC)
|
||||
fmt.Fprintf(w, "# PauseNs = %d\n", s.PauseNs)
|
||||
fmt.Fprintf(w, "# NumGC = %d\n", s.NumGC)
|
||||
fmt.Fprintf(w, "# EnableGC = %v\n", s.EnableGC)
|
||||
fmt.Fprintf(w, "# DebugGC = %v\n", s.DebugGC)
|
||||
}
|
||||
|
||||
fmt.Fprintf(b, "# BySize = Size * (Active = Mallocs - Frees)\n")
|
||||
fmt.Fprintf(b, "# (Excluding large blocks.)\n")
|
||||
for _, t := range s.BySize {
|
||||
if t.Mallocs > 0 {
|
||||
fmt.Fprintf(b, "# %d * (%d = %d - %d)\n", t.Size, t.Mallocs-t.Frees, t.Mallocs, t.Frees)
|
||||
}
|
||||
if tw != nil {
|
||||
tw.Flush()
|
||||
}
|
||||
return b.Flush()
|
||||
}
|
||||
|
||||
// WriteThreadProfile writes a pprof-formatted thread creation profile to w.
|
||||
// If a write to w returns an error, WriteThreadProfile returns that error.
|
||||
// Otherwise, WriteThreadProfile returns nil.
|
||||
func WriteThreadProfile(w io.Writer) error {
|
||||
// Find out how many records there are (ThreadProfile(nil)),
|
||||
// countThreadCreate returns the size of the current ThreadCreateProfile.
|
||||
func countThreadCreate() int {
|
||||
n, _ := runtime.ThreadCreateProfile(nil)
|
||||
return n
|
||||
}
|
||||
|
||||
// writeThreadCreate writes the current runtime ThreadCreateProfile to w.
|
||||
func writeThreadCreate(w io.Writer, debug int) error {
|
||||
return writeRuntimeProfile(w, debug, "threadcreate", runtime.ThreadCreateProfile)
|
||||
}
|
||||
|
||||
// countGoroutine returns the number of goroutines.
|
||||
func countGoroutine() int {
|
||||
return runtime.NumGoroutine()
|
||||
}
|
||||
|
||||
// writeGoroutine writes the current runtime GoroutineProfile to w.
|
||||
func writeGoroutine(w io.Writer, debug int) error {
|
||||
if debug >= 2 {
|
||||
return writeGoroutineStacks(w)
|
||||
}
|
||||
return writeRuntimeProfile(w, debug, "goroutine", runtime.GoroutineProfile)
|
||||
}
|
||||
|
||||
func writeGoroutineStacks(w io.Writer) error {
|
||||
// We don't know how big the buffer needs to be to collect
|
||||
// all the goroutines. Start with 1 MB and try a few times, doubling each time.
|
||||
// Give up and use a truncated trace if 64 MB is not enough.
|
||||
buf := make([]byte, 1<<20)
|
||||
for i := 0; ; i++ {
|
||||
n := runtime.Stack(buf, true)
|
||||
if n < len(buf) {
|
||||
buf = buf[:n]
|
||||
break
|
||||
}
|
||||
if len(buf) >= 64<<20 {
|
||||
// Filled 64 MB - stop there.
|
||||
break
|
||||
}
|
||||
buf = make([]byte, 2*len(buf))
|
||||
}
|
||||
_, err := w.Write(buf)
|
||||
return err
|
||||
}
|
||||
|
||||
func writeRuntimeProfile(w io.Writer, debug int, name string, fetch func([]runtime.StackRecord) (int, bool)) error {
|
||||
// Find out how many records there are (fetch(nil)),
|
||||
// allocate that many records, and get the data.
|
||||
// There's a race—more records (threads) might be added between
|
||||
// There's a race—more records might be added between
|
||||
// the two calls—so allocate a few extra records for safety
|
||||
// and also try again if we're very unlucky.
|
||||
// The loop should only execute one iteration in the common case.
|
||||
var p []runtime.ThreadProfileRecord
|
||||
n, ok := runtime.ThreadProfile(nil)
|
||||
var p []runtime.StackRecord
|
||||
n, ok := fetch(nil)
|
||||
for {
|
||||
// Allocate room for a slightly bigger profile,
|
||||
// in case a few more entries have been added
|
||||
// since the call to ThreadProfile.
|
||||
p = make([]runtime.ThreadProfileRecord, n+10)
|
||||
n, ok = runtime.ThreadProfile(p)
|
||||
p = make([]runtime.StackRecord, n+10)
|
||||
n, ok = fetch(p)
|
||||
if ok {
|
||||
p = p[0:n]
|
||||
break
|
||||
@ -135,19 +522,14 @@ func WriteThreadProfile(w io.Writer) error {
|
||||
// Profile grew; try again.
|
||||
}
|
||||
|
||||
b := bufio.NewWriter(w)
|
||||
fmt.Fprintf(b, "thread creation profile: %d threads\n", n)
|
||||
for i := range p {
|
||||
r := &p[i]
|
||||
fmt.Fprintf(b, "@")
|
||||
for _, pc := range r.Stack() {
|
||||
fmt.Fprintf(b, " %#x", pc)
|
||||
}
|
||||
fmt.Fprintf(b, "\n")
|
||||
}
|
||||
return b.Flush()
|
||||
return printCountProfile(w, debug, name, runtimeProfile(p))
|
||||
}
|
||||
|
||||
type runtimeProfile []runtime.StackRecord
|
||||
|
||||
func (p runtimeProfile) Len() int { return len(p) }
|
||||
func (p runtimeProfile) Stack(i int) []uintptr { return p[i].Stack() }
|
||||
|
||||
var cpu struct {
|
||||
sync.Mutex
|
||||
profiling bool
|
||||
|
||||
@ -2,11 +2,12 @@
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package tabwriter
|
||||
package tabwriter_test
|
||||
|
||||
import (
|
||||
"io"
|
||||
"testing"
|
||||
. "text/tabwriter"
|
||||
)
|
||||
|
||||
type buffer struct {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user