hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

krosenvold

           <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-compiler-plugin</artifactId>
               .....
               <dependencies>
                   <dependency>
                       <groupId>org.codehaus.plexus</groupId>
                       <artifactId>plexus-compiler-javac</artifactId>
                       <version>1.8.6</version>
                   </dependency>

dlutzy

# -*- mode: ruby -*-
# vi: set ft=ruby : 
# David Lutz's Multi VM Vagrantfile
# inspired from Mark Barger's https://gist.github.com/2404910

boxes = [
  { :name => :web,    :role => 'web_dev',     :ip => '192.168.33.1', :ssh_port => 2201, :http_fwd => 9980, :cpus =>4, :shares => true },
  { :name => :data,        :role => 'data_dev',         :ip => '192.168.33.2', :ssh_port => 2202, :mysql_fwd => 9936, :cpus =>4 },
  { :name => :railsapp,    :role => 'railsapp_dev',     :ip => '192.168.33.3', :ssh_port => 2203, :http_fwd => 9990, :cpus =>1}
]

radupotop

<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<!-- http://ubuntuforums.org/showthread.php?t=1354116 -->
<fontconfig>
	<!-- See: man 5 fonts-conf -->
	<!-- Antialias rules -->
	<match target="font">

		<!--Subpixel smoothing: rgb, bgr, vrgb, vbgr, none-->
		<edit mode="assign" name="rgba"><const>none</const></edit>

bfroehle

"""
An Python re-implementation of hierarchical module import.

Function names and arguments have been chosen to mimic the C code in
`Python/import.c` whenever possible.

This code is intended to be read, not executed.  However, it does work
-- all you need to do to enable it is "import knee".

(The name is a pun on the klunkier predecessor of this module, "ni".)

sivy

• Found from https://gist.github.com/889297
• Customised by Luke Morton
• Customized by sivy (for debian)

Ideally do this as SUDO

yum install -y git gcc gcc-c++ zlib-devel curl curl-devel openssl

Install node

wget http://nodejs.org/dist/node-v0.4.9.tar.gz

jchnkl

setopt nohup # recommended for bg'ing a proc
setopt nocheckjobs # recommended for bg'ing a proc
#setopt auto_continue # recommened for disown'ing a proc

local alwaysBackgroundPattern
alwaysBackgroundPattern=('firefox.*' 'thunderbird.*' 'urxvt.*')

function checkForXProc() {
    coproc isXWindow "$1" $(date +%s)
    disown %isXWindow

astrofrog

import time
import multiprocessing as mp

import numpy as np

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

jbrisbin

I've been hacking away recently at a JVM framework for doing asynchronous, non-blocking applications using a variation of the venerable Reactor pattern. The core of the framework is currently in Java. I started with Scala then went with Java and am now considering Scala again for the core. What can I say: I'm a grass-is-greener waffler! :) But it understands how to invoke Groovy Closures, Scala anonymous functions, and Clojure functions, so you can use the framework directly without needing wrappers.

I've been continually micro-benchmarking this framework because I feel that the JVM is a better foundation on which to build highly-concurrent, highly-scalable, C100K applications than V8 or Ruby. The problem has been, so far, no good tools exist for JVM developers to leverage the excellent performance and manageability of the JVM. This yet-to-be-publicly-released framework is an effort to give Java, Groovy, Scala, [X JVM language] developers access to an easy-to-use programming model that removes the necessity

shyiko

#!/bin/bash
JDGUI_BIN=$1; FILE_PATH=$2
DELIMITER_INDEX=$(awk -v a="$FILE_PATH" -v b="!/" 'BEGIN{print index(a,b)}')
if [ $DELIMITER_INDEX -eq 0 ]; then
    $JDGUI_BIN $FILE_PATH
else
    JAR_FILE=${FILE_PATH:0:$DELIMITER_INDEX-1}
    CLASS_RELATIVE_LOCATION=${FILE_PATH:$DELIMITER_INDEX+1}
    if [[ $CLASS_RELATIVE_LOCATION == "" ]]; then
        $JDGUI_BIN $JAR_FILE