Johnneylee Jack Rollins Spaceghost

Benchmarking ruby

The problem: Create a hash from an array of objects where the key is the object's #id and the value is the #stuff method.

Known/Suspected caveats:

Garbage collection might be happening, making the results lie.
Not exhaustive of ways to create a hash from an array
Not exhaustive of ways to call Benchmark.ips with code to test. (no strings yet)
Not able to manually change the number of iterations

Benchmarking #map

#map(&:id) is faster than a block.
#map is faster than #each_with_object when doing roughly the same work.

In short, this might make you want to extract more public methods, even if you use them in decorators or proxy objects, that you can call with Symbol#to_proc.

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

Install

Either copy the aliases from the .gitconfig or run the commands in add-pr-alias.sh

Usage

Easily checkout local copies of pull requests from GitHub remotes:

git pr 4 - creates local branch pr/4 from the origin remote and checks it out
git pr 4 upstream - creates local branch pr/4 from upstream remote and checks it out

	Calculating -------------------------------------
	#inject assign&return
	290.000 i/100ms
	merge 1.000 i/100ms
	merge! 106.000 i/100ms
	each_with_object 292.000 i/100ms
	zenspider 298.000 i/100ms
	pipework 299.000 i/100ms
	-------------------------------------------------
	#inject assign&return

	require 'benchmark/ips'

	User = Struct.new(:id, :stuff)
	a = Array.new(1000) { \|i\| User.new(i, stuff: rand(1000)) }

	Benchmark.ips do \|x\|
	x.report('#inject assign&return') do
	a.inject({}) { \|memo, i\| memo[i.id] = i.stuff; memo }
	end
	x.report('merge') do

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Label</key>
	<string>org.macports.gpg-agent</string>

	<!-- Please uncomment on 10.4; OnDemand doesn't work properly there. -->
	<!--
	<key>OnDemand</key>

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
	"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Label</key>
	<string>org.gnupg.gpg-agent</string>
	<key>ProgramArguments</key>
	<array>
	<string>start-gpg-agent</string>

	tim0thy:phoenix-demo32 pipework$ java -jar phoenix_demo32.jar
	Exception in thread "main" scala.MatchError: osx (of class java.lang.String)
	at com.sg.pnx.util.SysUtil$.nativeLibs(SysUtil.scala:41)
	at com.sg.pnx.util.SysUtil$.checkForNativeLibs(SysUtil.scala:88)
	at com.sg.pnx.util.SysUtil$.loadNativeLibs(SysUtil.scala:80)
	at com.sg.pnx.util.InitUtil$.init(InitUtil.scala:17)
	at com.sg.pnx.Game$.delayedEndpoint$com$sg$pnx$Game$1(Game.scala:17)
	at com.sg.pnx.Game$delayedInit$body.apply(Game.scala:13)
	at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
	at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)

	# JS config for NVIDIA SHIELD
	# Axes:
	# -----
	# 1 Left stick H
	# 2 Left stick V
	# 3 Left trigger
	# 4 Right stick H
	# 5 Right stick V
	# 6 Right trigger
	# 7 Pad H