felixyz’s gists

felixyz / pretty-date.rb

Created September 17, 2012 21:23 — forked from rjz/pretty-date.rb

Pretty Date in Ruby

	# Nothin' special here: just Resig's pretty date function ported to Ruby
	# http://ejohn.org/blog/javascript-pretty-date/

	def pretty_date(stamp)
	now = Time.new
	diff = now - stamp
	day_diff = ((now - stamp) / 86400).floor

	day_diff == 0 && (
	diff < 60 && "just now" \|\|

felixyz / crash_burn_symbols.rb

Last active December 13, 2015 17:38

Crash caused by archiving/dearchiving symbols in RubyMotion. I can't get an interesting stack trace out of this, and NSZombiesEnabled doesn't give me anything either, but the original bug that set me hunting did result in "-[Symbol methodSignatureForSelector:]: message sent to deallocated instance" (with zombies turned on). It doesn't seem to me…

	class AppDelegate
	def application(application, didFinishLaunchingWithOptions:launchOptions)
	@stuff = []
	NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "crash", userInfo:nil, repeats: true)
	NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "burn", userInfo:nil, repeats: true)
	true
	end

	def crash
	puts "crash"

felixyz / gist:5679768

Created May 30, 2013 17:57

Use Queue to keep synchronous interface while performing work in parallel. Queue is thread-safe, and extremely easy to use!

	require 'thread'

	def provider()
	threads = []
	queue = Queue.new
	1.upto(10).each do \|n\|
	threads << Thread.new {
	sleep rand(0.1..2)
	queue << n
	}

felixyz / celluloid_redis_bug.rb

Last active December 18, 2015 10:59

This illustrates celluloid-redis issue #9: https://github.com/celluloid/celluloid-redis/issues/9 A repo containing the below code and branches with variations that variously provoke the same bug or not can be found here: https://github.com/Felixyz/celluloid-redis-bug

	require 'thread'

	require 'celluloid/io'
	require 'celluloid/redis'

	KEY = "magic_key"
	VALUE = {a: 1, b:2}

	class RedisActor
	include Celluloid::IO

felixyz / gist:5788285

Created June 15, 2013 14:15

Creating and running >120 Celluloid::IO actors raises an error on MRI, even when doing NO I/O

	# Running on OS X
	# JRuby + Celluloid = OK
	# MRI + Celluloid = OK
	# JRuby + Celluloid::IO = OK
	# MRI + Celluloid::IO = Too many open files - pipe (Errno::EMFILE)

	require 'celluloid/io'

	class SimpleActor
	# include Celluloid # Creating regular Celluloid actors works on MRI

felixyz / gist:5788375

Created June 15, 2013 14:44

MRI pipe limit (on OS X). This script fails on my Mac after creating 125 x 2 pipe endpoints, raising "Too many open files (Errno::EMFILE)" This is the cause of the problem illustrated here: https://gist.github.com/Felixyz/5788285

	wakeups = []
	wakers = []

	puts "Creating pipes..."

	200.times do \|n\|
	puts "[#{n}]"
	wakeup, waker = IO.pipe
	wakeups << wakeup
	wakers << waker

felixyz / item_insert_benchmark.rb

Created September 16, 2013 15:40

Compares speed of two different methods of inserting items in an array.

	require 'benchmark'


	def insert_then_sort(results, missing_items)
	missing_items.each do \|id\|
	results << {id: id, val: nil}
	end
	results.sort_by!{\|item\| item[:id] }
	results
	end

felixyz / sidekiq_unique_jobs_bug_spec.rb

Created February 3, 2014 09:43

RSpec script attempting (and failing) to reproduce sidekiq-unique-jobs issue #27. https://github.com/mhenrixon/sidekiq-unique-jobs/issues/27

	require 'spec_helper'
	require 'sidekiq'
	require 'sidekiq/middleware/chain'
	require 'sidekiq/fetch'
	require 'sidekiq/processor'


	require 'redis/namespace'
	redis_url = 'redis://localhost/15'
	client = Redis.connect(:url => redis_url)

felixyz / Intro to Common Table Expressions.md

Last active February 5, 2025 15:29

Introduction to transitive closure / Common Table Expressions / iterative queries in SQL

Teh Social Netswork!

CREATE TABLE users (
 id SERIAL PRIMARY KEY,
 name VARCHAR(10) NOT NULL
);

INSERT into users VALUES

felixyz / runflora log

Last active August 29, 2015 14:11

Flora-2 failures on OSX

	$ ./flora2/runflora
	% Specialising partially instantiated calls to flora_assert_directories/1
	[Compiling Foreign Module /Users/felix/Documents/code/flora2/flora2bundle/flora2/cc/prolog2hilog (Prolog compiler options are ignored)]
	[prolog2hilog compiled, cpu time used: 0.0010 seconds]
	[Compiling C file /Users/felix/Documents/code/flora2/flora2bundle/flora2/cc/prolog2hilog.c using gcc]
	/Users/felix/Documents/code/flora2/flora2bundle/flora2/cc/prolog2hilog.c:365:9: warning: comparison of 0 > unsigned expression is always false [-Wtautological-compare]
	if (0 > length_diff) return FALSE;
	~ ^ ~~~~~~~~~~~
	1 warning generated.
	gcc -dynamiclib -undefined dynamic_lookup -fPIC -o /Users/felix/Documents/code/flora2/flora2bundle/flora2/cc/prolog2hilog.dylib /Users/felix/Documents/code/flora2/flora2bundle/flora2/cc/prolog2hilog.c -Wall -fPIC -I/Users/felix/Documents/code/flora2/flora2bundle/XSB/emu -I/Users/felix/Documents/code/flora2/flora2bundle/XSB/config/i386-apple-darwin13.2.0 -O3 -fno-strict-aliasing -

Felix Holmgren felixyz