Provides a low-level interface to the net/http/pprof package.

Package pprof serves via its HTTP server runtime profiling data
in the format expected by the pprof visualization tool.

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))

If you are not using DefaultServeMux, you will have to register handlers
with the mux you are using.

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?seconds=30

Or to look at the goroutine blocking profile, after calling
runtime.SetBlockProfileRate in your program:

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

Or to look at the holders of contended mutexes, after calling
runtime.SetMutexProfileFraction in your program:

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

The package also exports a handler that serves execution trace data
for the "go tool trace" command. To collect a 5-second execution trace:

wget -O trace.out http://localhost:6060/debug/pprof/trace?seconds=5
go tool trace trace.out

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

For a study of the facility in action, visit




Constants are variables with :const true in their metadata. Joker currently does not recognize them as special; as such, it allows redefining them or their values.


Functions, Macros, and Special Forms