ozeron

# https://github.com/ruby-prof/ruby-prof
require 'ruby-prof'

class DevProfiler
  BASE_PATH = "#{Rails.root}/tmp/performance/#{file_name}"
  def self.prof(file_name)
    RubyProf.start
    puts "Start profiling method"
    yield
    puts "Done Profiling!"

siannopollo

pluck_in_batches

Sometimes you need to iterate over a ton of items and you don't want the overhead of creating AR objects out of all of them. Hell, you only need a few things! Well, #pluck has your back.

But what if you want to iterate over many tonnes of items?

Pluck in batches to the rescue!

Enjoy!

gboudreau

#!/bin/sh

# Based on instructions found here: http://wiki.razuna.com/display/ecp/FFMpeg+Installation+on+CentOS+and+RedHat#FFMpegInstallationonCentOSandRedHat-InstallX264

if [ "`/usr/bin/whoami`" != "root" ]; then
    echo "You need to execute this script as root."
    exit 1
fi

cat > /etc/yum.repos.d/centos.repo<<EOF

zonomasa

$ git clone git@github.com:jemalloc/jemalloc.git
$ autoconf
$ ./configure
$ make
$ make install

tadast

# 1) Create your private key (any password will do, we remove it below)

$ cd ~/.ssh
$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key

chanks

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

SabretWoW

# This is a skeleton for testing models including examples of validations, callbacks,
# scopes, instance & class methods, associations, and more.
# Pick and choose what you want, as all models don't NEED to be tested at this depth.
#
# I'm always eager to hear new tips & suggestions as I'm still new to testing,
# so if you have any, please share!
#
# @kyletcarlson
#
# This skeleton also assumes you're using the following gems: 

ashrithr

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

• Producers send messages to brokers
• Consumers read messages from brokers
• Messages are sent to a topic

leemour

rails g devise:views

gem install html2haml
for file in app/views/devise/**/*.erb; do html2haml -e $file ${file%erb}haml && rm $file; done

gem install haml2slim
for file in app/views/devise/**/*.haml; do haml2slim $file ${file%haml}slim && rm $file; done

kyledrake

require 'tempfile'
require 'openssl'
require 'escape' # gem install escape

class CommandFailError < StandardError; end

def p12_to_pem_text(p12, pass='')
  pass = '' if pass.nil?

  # Use shell command for JRuby (see https://github.com/jruby/jruby-ossl/issues/8)