eluttner

Backend Architectures

Twitter

ror, scala, jetty, erlang, thrift, mongrel, comet server, my-sql, memchached, varnish, kestrel(mq), starling, gizzard, cassandra, hadoop, vertica, munin, nagios, awstats

• Introduce Gizzard of Twitter - 트위터의 새로운 분산 관리 라이브러리 Gizzard를 소개합니다.
• The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds
• Scaling Twitter: Making Twitter 10000 Percent Faster

nahurst

Latency Comparison Numbers                      Time     Light Distance    Approximate Light Distance
--------------------------                      ----     --------------    --------------------------
L1 cache reference                            0.5 ns             0.15 m    Diagonal across your smartphone
Branch mispredict                             5   ns             1.5  m    Height of Natalie Portman
L2 cache reference                            7   ns             2.1  m    Height of Shaq   
Mutex lock/unlock                            25   ns             7.5  m    Height of a school flag pole
Main memory reference                       100   ns            30    m    Half a Manhattan city block (North/South)
Compress 1K bytes with Zippy              3,000   ns           900    m    Width of Central Park
Send 1K bytes over 1 Gbps network        10,000   ns         3,000    m    Width of Manhattan
Read 4K randomly from SSD*              150,000   ns        45,000    m    NYC to Hempstead on Long Island

deanet

#!/bin/bash

## uploading to google
## rev: 22 Aug 2012 16:07

det=`date +%F`
browser="Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0.1"
username="[email protected]"
password="password"
accountype="HOSTED" #gooApps = HOSTED , gmail=GOOGLE

iros

Title

<Additional information about your API call. Try to use verbs that match both request type (fetching vs modifying) and plurality (one vs multiple).>

• URL

  <The URL Structure (path only, no root url)>

• Method:

piscisaureus

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:

un33k

Enable Shared Folders on vmware Fusion (4.x)+ (Example OS: Linux Ubuntu 12.x as guest OS)

1. First update your linux system:
sudo apt-get update
sudo apt-get install -y build-essential
sudo aptitude -y safe-upgrade

2. Reboot your system just in case you have a new kernel
sudo shutdown -r  now

omarrr

#!/bin/sh
(( ${#} > 0 )) || {
  echo 'DISCLAIMER: USE THIS SCRIPT AT YOUR OWN RISK!'
  echo 'THE AUTHOR TAKES NO RESPONSIBILITY FOR THE RESULTS OF THIS SCRIPT.'
  echo "Disclaimer aside, this worked for the author, for what that's worth."
  echo 'Press Control-C to quit now.'
  read
  echo 'Re-running the script with sudo.'
  echo 'You may be prompted for a password.'
  sudo ${0} sudo

dstroot

#!/bin/bash
###############################################
# To use: 
# https://raw.github.com/gist/2776351/???
# chmod 777 install_postgresql.sh
# ./install_postgresql.sh
###############################################
echo "*****************************************"
echo " Installing PostgreSQL"
echo "*****************************************"

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

lg0

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