wvengen

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

sh1n0b1

#!/usr/bin/python

# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford (jspenguin@jspenguin.org)
# The author disclaims copyright to this source code.

import sys
import struct
import socket
import time
import select

namuol

rage-quit support for bash

HOW TO INSTALL

Put flip somewhere in your $PATH and chmod a+x it.

Copy fuck into ~/.bashrc.

parndt

#!/usr/bin/env ruby
spec_hits = []

checks = {
            '_spec\.rb$' => ['focus:[:space:]*true'],
            '\.rb$' => ['binding\.pry', 'debugger']
         }

# Find the names of all the filenames that have been (A)dded (C)opied or (M)odified
filenames = `git diff --cached --name-only --diff-filter=ACM`.split("\n")

damncabbage

source :rubygems

gem 'rake'
gem 'sinatra'
gem 'activerecord'
gem 'sinatra-activerecord'

# Adapters
gem 'mysql2'
gem 'pg'

jamesmoriarty

1.9.2p290 :013 > render_erb("Hey, <%= first_name %> <%= last_name %>", :first_name => "James", :last_name => "Moriarty")
 => "Hey, James Moriarty" 

tomoconnor

subnet 192.168.0.0 netmask 255.255.255.0 {
	range 192.168.0.100 192.168.0.200;
	option broadcast-address 192.168.0.255;
	option routers 192.168.0.1;
	on commit {
		set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
		set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
		log(concat("Commit: IP: ", ClientIP, " Mac: ", ClientMac, "Hostname: ", host-decl-name));
		execute("/usr/local/bin/dhcp-event", "commit", ClientIP, ClientMac, host-decl-name);
	}

tomoconnor

#!/usr/bin/env python
import MySQLdb

import os, sys
import pprint
pp = pprint.PrettyPrinter()

mysql_host = "localhost"
mysql_user = "dbusername"
mysql_pass = "dbpassword"

vvalgis

set :rails_env, :production
set :unicorn_binary, "/usr/bin/unicorn"
set :unicorn_config, "#{current_path}/config/unicorn.rb"
set :unicorn_pid, "#{current_path}/tmp/pids/unicorn.pid"

namespace :deploy do
  task :start, :roles => :app, :except => { :no_release => true } do 
    run "cd #{current_path} && #{try_sudo} #{unicorn_binary} -c #{unicorn_config} -E #{rails_env} -D"
  end
  task :stop, :roles => :app, :except => { :no_release => true } do