go 1.5跟踪命令 [英] The go 1.5 trace command
问题描述
Go 1.5发布说明称,
新的go tool trace命令可以显示由新跟踪生成的程序跟踪运行时基础设施。
The Go 1.5 release note says,
The new "go tool trace" command enables the visualisation of program traces generated by new tracing infrastructure in the runtime.
This is really exciting, and I want to know more about it. But its official document at https://golang.org/cmd/trace/ is really dry.
Found that Rob Pike complained about it, requesting that "shortly after the 1.5 release, there should be a blog post about the feature."
If anyone has posted/spotted such a blog, please add a link here. Or, if you like to answer directly here, it is also welcome as well.
Thanks
There are two ways you can generate trace files.
Method 1
Add following line at the start of your program
f, err := os.Create(time.Now().Format("2006-01-02T150405.pprof")) if err != nil { panic(err) } defer f.Close() if err := trace.Start(f); err != nil { panic(err) } defer trace.Stop()
build the program
go build
- Run your program (for example
./myprogram
) - Run go trace.
go tool trace myprogram 2015-08-21T115354.pprof
Method 2
- Write a testing function utilizing testing package.
Run Test with trace flag
go test -trace trace.out
Run trace tool with generated .test and .out file
go tool trace pkg.test trace.out
In both cases your browser will open something like this
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