Rack::Probe : dtrace probes for your webapp

status

Rack::Probe (along with Dtracy) is part of the Ruby on Rail's Google Summer of Code '09 Quartet, with development updates and entertainment available at http://ecin.tumblr.com Welcome! Sit down, grab a sugary drink, and enjoy the smell of freshly baked code right out of the oven.

requirements

An operating system with support for Dtrace (http://www.sun.com/bigadmin/content/dtrace/) is a must. Mac OS X, Solaris/OpenSolaris and FreeBSD are all acceptable choices, though no testing has been done on FreeBSD.

gem dependencies

rack
ruby-dtrace

installing

gem sources -a http://gems.github.com

gem install ecin-rack-probe

setup

Rails Middleware:

Inside your config/environment.rb

config.gem "ecin-rack-probe", :lib => "rack/probe"

config.middleware.use "Rack::Probe"

Rack Middleware:

Inside your rackup file

require 'rack/probe' use Rack::Probe

use

From a terminal, run dtrace -n rack*::: -l to get a list of all the available probes. The number you'll see after 'rack' in the provider field is the PID of the process that's making the probes available.