Rbkit

[WARNING]

This project is not maintained at the moment. We have plans to work on a universal profiling protocol after which we intend to rewrite major parts of Rbkit.

rbkit is a Ruby gem that plugs into your ruby process, taps profiling data in realtime and sends it across the wire to the rbkit-client as packed messages.

Usage

Install prerequisites

Rbkit requires the following executables to be present :

• libtool
• autoconf
• automake

Install these with your operating system's package manager before proceeding to install Rbkit gem.

Add rbkit to Gemfile

Add the following to the project's Gemfiles

gem 'rbkit', path: <RBKIT_PATH>

and run bundle install

Installation without Rubygems

You can also install rbkit without bundler/rubygems. This can be useful, if you are profiling a Ruby app where you want to measure overhead of Rubygems/Bundler.

Just clone the repository or download from a release tag and run:

# Run from root of rbkit directory.
~> ruby setup.rb

This should install rbkit in ruby's site_dir and then you don't need rbkit added to your Gemfile for requiring rbkit.

Inject rbkit into code

Wherever you want to start profiling, add the following :

require 'rbkit' # Not needed in Rails
Rbkit.start_server

If using Rails, and you want to measure everything from the boot process, a good place to put this would be at the end of config/boot.rb.

Rbkit API

Rbkit.start_server

Without any arguments, it's same as :

Rbkit.start_server(pub_port: nil, request_port: nil)

Starts the Rbkit server and waits for a client to connect and issue commands to the request_port, until then there's zero performance overhead. Profiling data is sent asynchronously over pub_port. This method can be called early in a ruby application so that whenever profiling needs to be done, the client can attach itself to the inactive server, do the profiling and leave. Returns an instance of Rbkit::Server if server was started successfully, else returns false.

argument	valid values	default value	description
pub_port	nil, fixnum	nil	Override default message publishing port of 5555
request_port	nil, fixnum	nil	Override default command listener port of 5556

Rbkit.start_profiling

Without any arguments, it's same as :

Rbkit.start_profiling(
  pub_port: nil,
  request_port: nil,
  enable_object_trace: true,
  enable_gc_stats: true,
  enable_cpu_profiling: true,
  clock_type: :wall,
  cpu_profiling_mode: :sampling,
  cpu_sampling_interval_usec: 1000
)

Starts the server with all tracepoints enabled by default. User can optionally disable tracepoints using the optional arguments. This method can be used to profile the startup process of a ruby application where sending commands from the client to enable profiling is not feasible. Returns an instance of Rbkit::Server if server was started successfully, else returns false.

Arguments:

argument	valid values	default value	description
pub_port	nil, fixnum	nil	Override default message publishing port of 5555
request_port	nil, fixnum	nil	Override default command listener port of 5556
enable_object_trace	true/false	true	Enables object creation/deletion events
enable_gc_stats	true/false	true	Enables GC stats which is sent every 5 seconds
enable_cpu_profiling	true/false	true	Enables CPU profiling
clock_type	:wall/:cpu	:wall	Specifies clock type to use in CPU profiling
cpu_profiling_mode	:sampling	:sampling	CPU profiling mode - currently only sampling
cpu_sampling_interval_usec	Fixnums	1000	CPU Sampling interval un usec, if sampling mode

Development

Install zmq and msgpack

If zmq and msgpack are not installed, Rbkit automatically downloads and installs the two libraries from source during gem installation. But if you are developing Rbkit, it makes sense to have these preinstalled:

On OSX - Using homebrew following command should suffice:

~> brew install zeromq
~> brew install msgpack

On Linux - we recommend to download these libraries from their respective home pages and manually compiling and installing.

Recommended versions are:

Zeromq: 4.0.5_2 Msgpack: 0.5.9

Clone the repo

git clone [email protected]:code-mancers/rbkit.git

We'll call this <RBKIT_PATH>.

Set RBKIT_DEV environment flag

Set the environment variable RBKIT_DEV to true. If using bash, put export RBKIT_DEV=true in your ~/.bashrc.

This compiles the C extension with debug flag and also sets a macro named RBKIT_DEV inside the C extension.

Compile the C extension

Two ways to do this :

Using rake

cd <RBKIT_PATH>
bundle install
bundle exec rake compile

Or do it manually

cd <RBKIT_PATH/ext>
ruby extconf.rb
make
# Create a symlink at `lib/rbkit_server.bundle` (or .so if on linux)
# that points to `ext/rbkit_server.bundle`
# (in order to use `rbkit` gem in Gemfiles using `path` option)

Run the tests

bundle exec rake

TODO

TODOs are tracked as github issues.