forked from scionproto/scion
/
profile.go
70 lines (63 loc) · 1.81 KB
/
profile.go
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
// Copyright 2016 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package profile handles CPU and memory profiling. It should only be used for testing purposes,
// and not generally enabled in production.
package profile
import (
"fmt"
"os"
"runtime"
"runtime/pprof"
)
var cpuF, memF *os.File
func Start(name string) {
startCpu(name)
startMem(name)
}
func startCpu(name string) {
var err error
path := fmt.Sprintf("%s.cpu.pprof", name)
cpuF, err = os.Create(path)
if err != nil {
panic(fmt.Sprintf("Could not create CPU profile: %v", err))
}
if err := pprof.StartCPUProfile(cpuF); err != nil {
panic(fmt.Sprintf("Could not start CPU profile: %v", err))
}
fmt.Printf("CPU profiling to %v\n", path)
}
func startMem(name string) {
var err error
path := fmt.Sprintf("%s.mem.pprof", name)
memF, err = os.Create(path)
if err != nil {
panic(fmt.Sprintf("Could not create Mem profile: %v", err))
}
fmt.Printf("Mem profiling enabled (rate %d)\n", runtime.MemProfileRate)
}
func Stop() {
if cpuF != nil {
pprof.StopCPUProfile()
cpuF.Close()
fmt.Printf("CPU profiling stopped\n")
}
if memF != nil {
runtime.GC()
if err := pprof.WriteHeapProfile(memF); err != nil {
panic(fmt.Sprintf("Could not write memory profile: %v", err))
}
memF.Close()
fmt.Printf("Mem profiling stopped\n")
}
}