tiegz

module ObjectSpace
  def self.profile(&blk)
    require 'objspace'

    enable_gc = GC.disable
    ObjectSpace.trace_object_allocations(&blk)
    objs = Hash.new(0)
    ObjectSpace.each_object { |o|
      if (file = ObjectSpace.allocation_sourcefile(o)) && (line = ObjectSpace.allocation_sourceline(o))
        objs["#{file}:#{line}:#{o.class.name}"] += 1

croaky

heroku addons:add pgbackups --remote staging
heroku addons:add pgbackups --remote production
heroku pgbackups:capture --remote production
heroku pgbackups:restore DATABASE `heroku pgbackups:url --remote production` --remote staging

mrflip

>> load './RUNME-demo_of_async_fibers.rb'
/Users/flip/ics/backend/son_of_a_batch/RUNME-demo_of_async_fibers.rb:4: warning: already initialized constant FIBER_IDXS
814e5e90  0 f_0	beg main         	        top level
814e5e90  1 f_0	 beg em setup    	        this block sets up the eventmachine execution, but no execution-order shenanigans yet
814e5e90  2 f_0	  beg fiber stp	               	the end-the-reactor block won't be called for 1.5s, so we get here immediately.
814e5e90  3 f_0	  end fiber stp	               	nothing from inside the Fiber.new{} block has run yet.
814e5e90  4 f_0	  end fiber stp	               	kick off the fiber...
80d829a0  5 f_1	               	beg fiber      	when my_fiber.resume is called, this runs. Now in a new fiber
80d829a0  6 f_1	               	 beg get_result	get_result is called from within fiber_1
80d829a0  7 f_1	               	 setup callback	set up some code to run 1.5s from now

therealadam

class QueryTracer < ActiveSupport::LogSubscriber

  ACCEPT = %r{^(app|config|lib)}.freeze
  FRAMES = 5
  THRESHOLD = 300 # In ms

  def sql(event)
    return unless event.duration > THRESHOLD
    callers = Rails.
      backtrace_cleaner.

bkeepers

GC.copy_on_write_friendly = true if GC.respond_to?(:copy_on_write_friendly=)

Benchmark.bm(10) do |x|
  x.report do
    100.times do
      100.times { fork {} }
      Process.waitall
    end
  end
end

defunkt

#!/usr/bin/env ruby
# Usage: gemspec [-s] GEMNAME
#
# Prints a basic gemspec for GEMNAME based on your git-config info.
# If -s is passed, saves it as a GEMNAME.gemspec in the current
# directory. Otherwise prints to standard output.
#
# Once you check this gemspec into your project, releasing a new gem
# is dead simple:
#