Philip Gardner gaahrdner

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

ABOUT

about:config settings to harden the Firefox browser. Privacy and performance enhancements.
To change these settings type 'about:config' in the url bar. Then search the setting you would like to change and modify the value. Some settings may break certain websites from functioning and rendering normally. Some settings may also make firefox unstable. I am not liable for any damages/loss of data.

Not all these changes are necessary and will be dependent upon your usage and hardware. Do some research on settings if you don't understand what they do. These settings are best combined with your standard privacy extensions (~~HTTPS Everywhere~~ No longer required: Enable HTTPS-Only Mode, NoScript/Request Policy, uBlock origin, agent spoofing, ~~Privacy Badger~~ etc), and all plugins set to "Ask To Activate".

Shakespeare Sonnet++ Postmortem (incident #465)

Date

2015-10-21

Authors

jennifer
martym

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

0.1. References
0.2. Other cheatsheets
0.3. Manage multiple gcloud config configurations
- 0.3.1. Switch gcloud context with gcloud config
0.4. Credentials
0.5. info
0.6. projects
0.7. zones & regions
0.8. Organization
0.9. billing

	#!/bin/bash

	if [ "$1" = "-h" -o "$1" = "--help" -o -z "$1" ]; then cat <<EOF
	appify v3.0.1 for Mac OS X - http://mths.be/appify
	Creates the simplest possible Mac app from a shell script.

	Appify takes a shell script as its first argument:

	`basename "$0"` my-script.sh

	#!/usr/bin/env ruby
	#
	# Proof-of-Concept RCE exploit against Gemcutter
	#
	# ## Advisory
	#
	# ## Caveats
	#
	# ## Synopsis
	#

	#!/bin/bash
	#
	# GoLang cross-compile snippet for Go 1.6+ based loosely on Dave Chaney's cross-compile script:
	# http://dave.cheney.net/2012/09/08/an-introduction-to-cross-compilation-with-go
	#
	# To use:
	#
	# $ cd ~/path-to/my-awesome-project
	# $ go-build-all
	#

	###
	###
	### UPDATE: For Win 11, I recommend using this tool in place of this script:
	### https://christitus.com/windows-tool/
	### https://github.com/ChrisTitusTech/winutil
	### https://www.youtube.com/watch?v=6UQZ5oQg8XA
	### iwr -useb https://christitus.com/win \| iex
	###
	###

	#!/usr/bin/env bash

	readonly _skip_examples="local-image-skip-examples"

	usage() {
	local scriptname
	scriptname="$(basename "$0")"
	cat <<-EOF
	Usage: ${scriptname} command