garybernhardt

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

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

korczis

# Available cops (167) + config for /Users/tomaskorcak/dev/gooddata-ruby: 
# Type 'Lint' (32):
AmbiguousOperator:
  Description: Checks for ambiguous operators in the first argument of a method invocation
    without parentheses.
  Enabled: true

AmbiguousRegexpLiteral:
  Description: Checks for ambiguous regexp literals in the first argument of a method
    invocation without parenthesis.

troy

# Outputs this at warn log level:
# 1.2.3.4 GET /path 200 OK BlahController#action HTML 938.2 (DB 11.8, View 719.7) {params} {optional params from flash[:log]}
# 
# Save as config/initializers/oneline_detailed_logging.rb. Consider 
# decreasing the log level from "info" to "warn" (in production.rb) so 
# the one-line log message replaces the standard request logs.


# override process_action to add 2 things to the payload:
# - remote IP

dhh

class PostsController < ActionController::Base
  def create
    Post.create(post_params)
  end
  
  def update
    Post.find(params[:id]).update_attributes!(post_params)
  end

  private

javan

Found this tip in comment here: http://www.tipb.com/2011/01/04/tipb-bug-home-button-working-iphone/

1.) Open any application

2.) Press and hold the power button until the slide to shutdown swipe bar appears.

3.) Release Power button

4.) Press and hold Home button Lightly 
until screen returns to icon screen