go goroutines 源码
golang goroutines 代码
文件路径：/src/cmd/trace/goroutines.go
// Copyright 2014 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.
// Goroutine-related profiles.
package main
import (
"fmt"
"html/template"
"internal/trace"
"log"
"net/http"
"reflect"
"sort"
"strconv"
"sync"
"time"
)
func init() {
http.HandleFunc("/goroutines", httpGoroutines)
http.HandleFunc("/goroutine", httpGoroutine)
}
// gtype describes a group of goroutines grouped by start PC.
type gtype struct {
ID uint64 // Unique identifier (PC).
Name string // Start function.
N int // Total number of goroutines in this group.
ExecTime int64 // Total execution time of all goroutines in this group.
}
var (
gsInit sync.Once
gs map[uint64]*trace.GDesc
)
// analyzeGoroutines generates statistics about execution of all goroutines and stores them in gs.
func analyzeGoroutines(events []*trace.Event) {
gsInit.Do(func() {
gs = trace.GoroutineStats(events)
})
}
// httpGoroutines serves list of goroutine groups.
func httpGoroutines(w http.ResponseWriter, r *http.Request) {
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
analyzeGoroutines(events)
gss := make(map[uint64]gtype)
for _, g := range gs {
gs1 := gss[g.PC]
gs1.ID = g.PC
gs1.Name = g.Name
gs1.N++
gs1.ExecTime += g.ExecTime
gss[g.PC] = gs1
}
var glist []gtype
for k, v := range gss {
v.ID = k
glist = append(glist, v)
}
sort.Slice(glist, func(i, j int) bool { return glist[i].ExecTime > glist[j].ExecTime })
w.Header().Set("Content-Type", "text/html;charset=utf-8")
if err := templGoroutines.Execute(w, glist); err != nil {
log.Printf("failed to execute template: %v", err)
return
}
}
var templGoroutines = template.Must(template.New("").Parse(`
<html>
<body>
Goroutines: <br>
{{range $}}
<a href="/goroutine?id={{.ID}}">{{.Name}}</a> N={{.N}} <br>
{{end}}
</body>
</html>
`))
// httpGoroutine serves list of goroutines in a particular group.
func httpGoroutine(w http.ResponseWriter, r *http.Request) {
// TODO(hyangah): support format=csv (raw data)
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
pc, err := strconv.ParseUint(r.FormValue("id"), 10, 64)
if err != nil {
http.Error(w, fmt.Sprintf("failed to parse id parameter '%v': %v", r.FormValue("id"), err), http.StatusInternalServerError)
return
}
analyzeGoroutines(events)
var (
glist []*trace.GDesc
name string
totalExecTime, execTime int64
maxTotalTime int64
)
for _, g := range gs {
totalExecTime += g.ExecTime
if g.PC != pc {
continue
}
glist = append(glist, g)
name = g.Name
execTime += g.ExecTime
if maxTotalTime < g.TotalTime {
maxTotalTime = g.TotalTime
}
}
execTimePercent := ""
if totalExecTime > 0 {
execTimePercent = fmt.Sprintf("%.2f%%", float64(execTime)/float64(totalExecTime)*100)
}
sortby := r.FormValue("sortby")
_, ok := reflect.TypeOf(trace.GDesc{}).FieldByNameFunc(func(s string) bool {
return s == sortby
})
if !ok {
sortby = "TotalTime"
}
sort.Slice(glist, func(i, j int) bool {
ival := reflect.ValueOf(glist[i]).Elem().FieldByName(sortby).Int()
jval := reflect.ValueOf(glist[j]).Elem().FieldByName(sortby).Int()
return ival > jval
})
err = templGoroutine.Execute(w, struct {
Name string
PC uint64
N int
ExecTimePercent string
MaxTotal int64
GList []*trace.GDesc
}{
Name: name,
PC: pc,
N: len(glist),
ExecTimePercent: execTimePercent,
MaxTotal: maxTotalTime,
GList: glist})
if err != nil {
http.Error(w, fmt.Sprintf("failed to execute template: %v", err), http.StatusInternalServerError)
return
}
}
var templGoroutine = template.Must(template.New("").Funcs(template.FuncMap{
"prettyDuration": func(nsec int64) template.HTML {
d := time.Duration(nsec) * time.Nanosecond
return template.HTML(niceDuration(d))
},
"percent": func(dividend, divisor int64) template.HTML {
if divisor == 0 {
return ""
}
return template.HTML(fmt.Sprintf("(%.1f%%)", float64(dividend)/float64(divisor)*100))
},
"barLen": func(dividend, divisor int64) template.HTML {
if divisor == 0 {
return "0"
}
return template.HTML(fmt.Sprintf("%.2f%%", float64(dividend)/float64(divisor)*100))
},
"unknownTime": func(desc *trace.GDesc) int64 {
sum := desc.ExecTime + desc.IOTime + desc.BlockTime + desc.SyscallTime + desc.SchedWaitTime
if sum < desc.TotalTime {
return desc.TotalTime - sum
}
return 0
},
}).Parse(`
<!DOCTYPE html>
<title>Goroutine {{.Name}}</title>
<style>
th {
background-color: #050505;
color: #fff;
}
th.total-time,
th.exec-time,
th.io-time,
th.block-time,
th.syscall-time,
th.sched-time,
th.sweep-time,
th.pause-time {
cursor: pointer;
}
table {
border-collapse: collapse;
}
.details tr:hover {
background-color: #f2f2f2;
}
.details td {
text-align: right;
border: 1px solid black;
}
.details td.id {
text-align: left;
}
.stacked-bar-graph {
width: 300px;
height: 10px;
color: #414042;
white-space: nowrap;
font-size: 5px;
}
.stacked-bar-graph span {
display: inline-block;
width: 100%;
height: 100%;
box-sizing: border-box;
float: left;
padding: 0;
}
.unknown-time { background-color: #636363; }
.exec-time { background-color: #d7191c; }
.io-time { background-color: #fdae61; }
.block-time { background-color: #d01c8b; }
.syscall-time { background-color: #7b3294; }
.sched-time { background-color: #2c7bb6; }
</style>
<script>
function reloadTable(key, value) {
let params = new URLSearchParams(window.location.search);
params.set(key, value);
window.location.search = params.toString();
}
</script>
<table class="summary">
<tr><td>Goroutine Name:</td><td>{{.Name}}</td></tr>
<tr><td>Number of Goroutines:</td><td>{{.N}}</td></tr>
<tr><td>Execution Time:</td><td>{{.ExecTimePercent}} of total program execution time </td> </tr>
<tr><td>Network Wait Time:</td><td> <a href="/io?id={{.PC}}">graph</a><a href="/io?id={{.PC}}&raw=1" download="io.profile">(download)</a></td></tr>
<tr><td>Sync Block Time:</td><td> <a href="/block?id={{.PC}}">graph</a><a href="/block?id={{.PC}}&raw=1" download="block.profile">(download)</a></td></tr>
<tr><td>Blocking Syscall Time:</td><td> <a href="/syscall?id={{.PC}}">graph</a><a href="/syscall?id={{.PC}}&raw=1" download="syscall.profile">(download)</a></td></tr>
<tr><td>Scheduler Wait Time:</td><td> <a href="/sched?id={{.PC}}">graph</a><a href="/sched?id={{.PC}}&raw=1" download="sched.profile">(download)</a></td></tr>
</table>
<p>
<table class="details">
<tr>
<th> Goroutine</th>
<th onclick="reloadTable('sortby', 'TotalTime')" class="total-time"> Total</th>
<th></th>
<th onclick="reloadTable('sortby', 'ExecTime')" class="exec-time"> Execution</th>
<th onclick="reloadTable('sortby', 'IOTime')" class="io-time"> Network wait</th>
<th onclick="reloadTable('sortby', 'BlockTime')" class="block-time"> Sync block </th>
<th onclick="reloadTable('sortby', 'SyscallTime')" class="syscall-time"> Blocking syscall</th>
<th onclick="reloadTable('sortby', 'SchedWaitTime')" class="sched-time"> Scheduler wait</th>
<th onclick="reloadTable('sortby', 'SweepTime')" class="sweep-time"> GC sweeping</th>
<th onclick="reloadTable('sortby', 'GCTime')" class="pause-time"> GC pause</th>
</tr>
{{range .GList}}
<tr>
<td> <a href="/trace?goid={{.ID}}">{{.ID}}</a> </td>
<td> {{prettyDuration .TotalTime}} </td>
<td>
<div class="stacked-bar-graph">
{{if unknownTime .}}<span style="width:{{barLen (unknownTime .) $.MaxTotal}}" class="unknown-time"> </span>{{end}}
{{if .ExecTime}}<span style="width:{{barLen .ExecTime $.MaxTotal}}" class="exec-time"> </span>{{end}}
{{if .IOTime}}<span style="width:{{barLen .IOTime $.MaxTotal}}" class="io-time"> </span>{{end}}
{{if .BlockTime}}<span style="width:{{barLen .BlockTime $.MaxTotal}}" class="block-time"> </span>{{end}}
{{if .SyscallTime}}<span style="width:{{barLen .SyscallTime $.MaxTotal}}" class="syscall-time"> </span>{{end}}
{{if .SchedWaitTime}}<span style="width:{{barLen .SchedWaitTime $.MaxTotal}}" class="sched-time"> </span>{{end}}
</div>
</td>
<td> {{prettyDuration .ExecTime}}</td>
<td> {{prettyDuration .IOTime}}</td>
<td> {{prettyDuration .BlockTime}}</td>
<td> {{prettyDuration .SyscallTime}}</td>
<td> {{prettyDuration .SchedWaitTime}}</td>
<td> {{prettyDuration .SweepTime}} {{percent .SweepTime .TotalTime}}</td>
<td> {{prettyDuration .GCTime}} {{percent .GCTime .TotalTime}}</td>
</tr>
{{end}}
</table>
`))
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