go-dtrace

If you want to fire DTrace probes from within your Go program, go-dtrace is for you. It wraps libusdt to provide DTrace probe definition in go.

compiling libusdt

In order to use go-dtrace, libusdt needs to be compiled as a shared library. To achieve this in Mac OS X:

• $ git clone https://github.com/chrisa/libusdt.git
• $ cd libusdt
• $ make
• $ rm usdt_tracepoints.o
• $ cc -dynamiclib -install_name /usr/local/lib/libusdt.dylib -flat_namespace -o libusdt.dylib *.o
• $ mkdir -p /usr/local/lib
• $ cp libusdt.dylib /usr/local/lib/libusdt.dylib

Have instructions for another OS? Add 'em here!

go install

Once libusdt is installed, you can install go-dtrace from the command line:

• $ go get github.com/ecin/go-dtrace

example

package main

import (
  "github.com/ecin/go-dtrace"
  "reflect"
  "time"
  "fmt"
)

func main() {
  provider := dtrace.NewProvider("go-dtrace", "example")

  probe := provider.AddProbe("fire", "1", reflect.Int, reflect.String)
  fmt.Printf("%s:%s:%s:%s is ready to fire!\n", provider.Name, provider.Module, probe.Function, probe.Name)

  // Enable the provider AFTER defining probes
  provider.Enable()

  for i := 0;; i += 1 {
    probe.Fire(i, "Boom!")
    time.Sleep(1 * time.Second)
  }
}

Run sudo dtrace -n "go-dtrace*:::" to see your DTrace probe fire at 1 glorious Hz.