Bram Swenson bramswenson

# uname -a
Linux base 4.0.5-gentoo #1 SMP Wed Jul 1 02:23:16 JST 2015 x86_64 Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz GenuineIntel GNU/Linux

Packages

# emerge -pvq openldap openssh sssd sudo
[ebuild R ] net-nds/openldap-2.4.38-r2 USE="berkdb crypt gnutls ipv6 minimal sasl ssl syslog tcpd -cxx -debug -experimental -icu -iodbc -kerberos -odbc -overlays -perl -samba (-selinux) -slp -smbkrb5passwd" ABI_X86="(64) -32 (-x32)"

git clone https://gist.github.com/dd6f95398c1bdc9f1038.git vault
cd vault
docker-compose up -d
export VAULT_ADDR=http://192.168.99.100:8200

Initializing a vault:

vault init

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"]

	To open the Windows command prompt you may do one of the following:
	- Click Start -> Programs -> Accessories -> Command Prompt
	- Click Start (or hit the Windows key), type “cmd” in search, then hit [ENTER]
	- Windows Key + R (#r, not the pound symbol) brings up Run. Then type “cmd” then [ENTER]

	*********** Basic Command Prompt Commands ***********
	x /? = provides syntax info and complete list of all parameters for x (a command, like “cd”)
	cd = change directory
	cd .. = move to the parent directory
	cd\ = move to the root of current drive

	daemon off;

	worker_processes 1;

	events { worker_connections 1024; }

	http{

	sendfile on;

	from sqlalchemy import create_engine
	from sqlalchemy.orm import Session
	from myapp.models import BaseModel
	import pytest


	@pytest.fixture(scope="session")
	def engine():
	return create_engine("postgresql://localhost/test_database")

	"""
	Copies all keys from the source Redis host to the destination Redis host.
	Useful to migrate Redis instances where commands like SLAVEOF and MIGRATE are
	restricted (e.g. on Amazon ElastiCache).

	The script scans through the keyspace of the given database number and uses
	a pipeline of DUMP and RESTORE commands to migrate the keys.

	Requires Redis 2.8.0 or higher.

	#cloud-config
	bootcmd:
	- \|
	/bin/bash <<-'EOS'
	#!/bin/bash
	exec > >(tee /root/log.txt)
	exec 2>&1
	set -x
	set -e
	if [ -e /new ]; then

	@[Link("curl")]
	lib LibCurl
	type CURL = Void*
	type CURLoption = Int32


	fun create = curl_easy_init(): CURL
	fun set_opt = curl_easy_setopt(CURL, Int32, UInt8*)
	fun get = curl_easy_perform(CURL)
	fun cleanup = curl_easy_cleanup(CURL)

	# Hello, and welcome to makefile basics.
	#
	# You will learn why `make` is so great, and why, despite its "weird" syntax,
	# it is actually a highly expressive, efficient, and powerful way to build
	# programs.
	#
	# Once you're done here, go to
	# http://www.gnu.org/software/make/manual/make.html
	# to learn SOOOO much more.