krasnoukhov

My largest Sidekiq application had a memory leak and I was able to find and fix it in just few hours spent on analyzing Ruby's heap. In this post I'll show my profiling setup.

As you might know Ruby 2.1 introduced a few great changes to ObjectSpace, so now it's much easier to find a line of code that is allocating too many objects. Here is great post explaining how it's working.

I was too lazy to set up some seeding and run it locally, so I checked that test suite passes when profiling is enabled and pushed debugging to production. Production environment also suited me better since my jobs data can't be fully random generated.

So, in order to profile your worker, add this to your Sidekiq configuration:

if ENV["PROFILE"]

mwean

CREATE INDEX index_description_on_icd_codes ON icd_codes USING gin(to_tsvector(description))

jrochkind

######################
#
#  Monkey patch to ActiveRecord to prevent 'implicit' checkouts. Currently tested with Rails 4.0.8, prob
#  should work fine in Rails 4.1 too. 
#
#  If you create a thread yourself, if it uses ActiveRecord objects without
#  explicitly checking out a connection, one will still be checked out implicitly.
#  If it is never checked back in with `ActiveRecord::Base.clear_active_connections!`,
#  then it will be leaked. 
#

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

lperrin

app.directive('faFastScroll', ['$parse', function ($parse) {
  var Interval = function(min, max) {
    this.min = min || 0;
    this.max = max || 0;
  };

  Interval.prototype.clip = function(min, max) {
    if(this.max <= min || this.min >= max) {
      this.min = this.max = 0;

lfender6445

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

jtomaszewski

# Idea from http://krautcomputing.com/blog/2012/10/07/how-to-make-everything-background-processable-through-sidekiq/
# 
# Usage:
# 
#   class Synchronization
#     include Asyncable
#   end
# 
# Then:
#   Synchronization.find(12).perform_async(:synchronize, 3, 2)

andrewvc

# ElasticSearch upstart script

description     "ElasticSearch service"

start on (net-device-up
          and local-filesystems
          and runlevel [2345])

stop on runlevel [016]

dypsilon

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

This page is not maintained anymore, please update your bookmarks.

---

plusjade

# place in ./config/initializers
# Usage
# LL.warn "blah"
# LL.warn @profile.inspect

require 'pp'
require 'log4r'
require 'log4r/configurator'
require 'log4r/yamlconfigurator'
require 'log4r/outputter/fileoutputter'