pprof用于性能分析，trace用于查看go运行时执行的动作，比如协程因为什么阻塞
package main
import (
"os"
"runtime/trace"
)
func main() {
trace.Start(os.Stderr)
defer trace.Stop()
ch := make(chan string)
go func() {
ch <- "TRACE"
}()
<-ch
}
指定ip和端口启动trace，允许非本机访问，
go build -o demo demo.go
./demo 2>trace.out
go tool trace -http=":9999" trace.out
各个栏目介绍:
View trace
Goroutine analysis //协程分析
Network blocking profile (⬇) //网络阻塞情况
Synchronization blocking profile (⬇) //同步阻塞情况
Syscall blocking profile (⬇) //系统调用阻塞情况
Scheduler latency profile (⬇)
User-defined tasks
User-defined regions
Minimum mutator utilization
详细可以参考: juejin.cn/post/684490…
错误整理
点击 Network blocking profile 报错:
failed to execute go tool pprof: exit status 1
failed to execute dot. Is Graphviz installed? Error: exec: "dot": executable file not found in $PATH
下载安装Graphviz, graphviz.org/download/
yum install graphviz
本地安装k8s导致采用了google yum源，需要修改为阿里源或者网易源:
mv kubernetes.repo kubernetes.repo.bak
yum clean all
yum makecache
yum update
yum install graphviz
