1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// 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.
// Serving of pprof-like profiles.
package main
import (
"bufio"
"fmt"
"internal/trace"
"io/ioutil"
"net/http"
"os"
"os/exec"
)
func init() {
http.HandleFunc("/io", httpIO)
http.HandleFunc("/block", httpBlock)
http.HandleFunc("/syscall", httpSyscall)
http.HandleFunc("/sched", httpSched)
}
// Record represents one entry in pprof-like profiles.
type Record struct {
stk []*trace.Frame
n uint64
time int64
}
// httpIO serves IO pprof-like profile (time spent in IO wait).
func httpIO(w http.ResponseWriter, r *http.Request) {
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
prof := make(map[uint64]Record)
for _, ev := range events {
if ev.Type != trace.EvGoBlockNet || ev.Link == nil || ev.StkID == 0 || len(ev.Stk) == 0 {
continue
}
rec := prof[ev.StkID]
rec.stk = ev.Stk
rec.n++
rec.time += ev.Link.Ts - ev.Ts
prof[ev.StkID] = rec
}
serveSVGProfile(w, r, prof)
}
// httpBlock serves blocking pprof-like profile (time spent blocked on synchronization primitives).
func httpBlock(w http.ResponseWriter, r *http.Request) {
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
prof := make(map[uint64]Record)
for _, ev := range events {
switch ev.Type {
case trace.EvGoBlockSend, trace.EvGoBlockRecv, trace.EvGoBlockSelect,
trace.EvGoBlockSync, trace.EvGoBlockCond:
default:
continue
}
if ev.Link == nil || ev.StkID == 0 || len(ev.Stk) == 0 {
continue
}
rec := prof[ev.StkID]
rec.stk = ev.Stk
rec.n++
rec.time += ev.Link.Ts - ev.Ts
prof[ev.StkID] = rec
}
serveSVGProfile(w, r, prof)
}
// httpSyscall serves syscall pprof-like profile (time spent blocked in syscalls).
func httpSyscall(w http.ResponseWriter, r *http.Request) {
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
prof := make(map[uint64]Record)
for _, ev := range events {
if ev.Type != trace.EvGoSysCall || ev.Link == nil || ev.StkID == 0 || len(ev.Stk) == 0 {
continue
}
rec := prof[ev.StkID]
rec.stk = ev.Stk
rec.n++
rec.time += ev.Link.Ts - ev.Ts
prof[ev.StkID] = rec
}
serveSVGProfile(w, r, prof)
}
// httpSched serves scheduler latency pprof-like profile
// (time between a goroutine become runnable and actually scheduled for execution).
func httpSched(w http.ResponseWriter, r *http.Request) {
events, err := parseEvents()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
prof := make(map[uint64]Record)
for _, ev := range events {
if (ev.Type != trace.EvGoUnblock && ev.Type != trace.EvGoCreate) ||
ev.Link == nil || ev.StkID == 0 || len(ev.Stk) == 0 {
continue
}
rec := prof[ev.StkID]
rec.stk = ev.Stk
rec.n++
rec.time += ev.Link.Ts - ev.Ts
prof[ev.StkID] = rec
}
serveSVGProfile(w, r, prof)
}
// generateSVGProfile generates pprof-like profile stored in prof and writes in to w.
func serveSVGProfile(w http.ResponseWriter, r *http.Request, prof map[uint64]Record) {
blockf, err := ioutil.TempFile("", "block")
if err != nil {
http.Error(w, fmt.Sprintf("failed to create temp file: %v", err), http.StatusInternalServerError)
return
}
defer os.Remove(blockf.Name())
blockb := bufio.NewWriter(blockf)
fmt.Fprintf(blockb, "--- contention:\ncycles/second=1000000000\n")
for _, rec := range prof {
fmt.Fprintf(blockb, "%v %v @", rec.time, rec.n)
for _, f := range rec.stk {
fmt.Fprintf(blockb, " 0x%x", f.PC)
}
fmt.Fprintf(blockb, "\n")
}
err = blockb.Flush()
if err != nil {
http.Error(w, fmt.Sprintf("failed to flush temp file: %v", err), http.StatusInternalServerError)
return
}
err = blockf.Close()
if err != nil {
http.Error(w, fmt.Sprintf("failed to close temp file: %v", err), http.StatusInternalServerError)
return
}
svgFilename := blockf.Name() + ".svg"
_, err = exec.Command("go", "tool", "pprof", "-svg", "-output", svgFilename, programBinary, blockf.Name()).CombinedOutput()
if err != nil {
http.Error(w, fmt.Sprintf("failed to execute go tool pprof: %v", err), http.StatusInternalServerError)
return
}
defer os.Remove(svgFilename)
w.Header().Set("Content-Type", "image/svg+xml")
http.ServeFile(w, r, svgFilename)
}
|
