doc.go

Documentation: cmd/trace

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  /*
     6  Trace is a tool for viewing trace files.
     7  
     8  Trace files can be generated with:
     9  	- runtime/trace.Start
    10  	- net/http/pprof package
    11  	- go test -trace
    12  
    13  Example usage:
    14  Generate a trace file with 'go test':
    15  	go test -trace trace.out pkg
    16  View the trace in a web browser:
    17  	go tool trace trace.out
    18  Generate a pprof-like profile from the trace:
    19  	go tool trace -pprof=TYPE trace.out > TYPE.pprof
    20  
    21  Supported profile types are:
    22  	- net: network blocking profile
    23  	- sync: synchronization blocking profile
    24  	- syscall: syscall blocking profile
    25  	- sched: scheduler latency profile
    26  
    27  Then, you can use the pprof tool to analyze the profile:
    28  	go tool pprof TYPE.pprof
    29  
    30  Note that while the various profiles available when launching
    31  'go tool trace' work on every browser, the trace viewer itself
    32  (the 'view trace' page) comes from the Chrome/Chromium project
    33  and is only actively tested on that browser.
    34  */
    35  package main
    36
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