Package pprof serves via its HTTP server runtime profiling data in the format expected by the pprof visualization tool. For more information about pprof, see

    The package is typically only imported for the side effect of registering its HTTP handlers. The handled paths all begin with /debug/pprof/.

    To use pprof, link this package into your program:

    import _ "net/http/pprof"

    If your application is not already running an http server, you need to start one. Add "net/http" and "log" to your imports and the following code to your main function:

    go func() {
    	log.Println(http.ListenAndServe("localhost:6060", nil))

    Then use the pprof tool to look at the heap profile:

    go tool pprof http://localhost:6060/debug/pprof/heap

    Or to look at a 30-second CPU profile:

    go tool pprof http://localhost:6060/debug/pprof/profile

    Or to look at the goroutine blocking profile:

    go tool pprof http://localhost:6060/debug/pprof/block

    To view all available profiles, open http://localhost:6060/debug/pprof/ in your browser.

    For a study of the facility in action, visit



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    func Cmdline

    func Cmdline(w http.ResponseWriter, r *http.Request)

      Cmdline responds with the running program's command line, with arguments separated by NUL bytes. The package initialization registers it as /debug/pprof/cmdline.

      func Handler

      func Handler(name string) http.Handler

        Handler returns an HTTP handler that serves the named profile.

        func Index

        func Index(w http.ResponseWriter, r *http.Request)

          Index responds with the pprof-formatted profile named by the request. For example, "/debug/pprof/heap" serves the "heap" profile. Index responds to a request for "/debug/pprof/" with an HTML page listing the available profiles.

          func Profile

          func Profile(w http.ResponseWriter, r *http.Request)

            Profile responds with the pprof-formatted cpu profile. The package initialization registers it as /debug/pprof/profile.

            func Symbol

            func Symbol(w http.ResponseWriter, r *http.Request)

              Symbol looks up the program counters listed in the request, responding with a table mapping program counters to function names. The package initialization registers it as /debug/pprof/symbol.


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              Source Files