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cd $JAVA_HOME/bin

echo 'grant codebase "file:${java.home}/../lib/tools.jar" {permission java.security.AllPermission;};' > jstatd.all.policy
./jstatd -J-Djava.security.policy=jstatd.all.policy

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#!/bin/bash

wget https://github.com/dcevm/dcevm/releases/download/light-jdk8u92%2B1/DCEVM-light-8u92-installer.jar
unzip -d dcevm DCEVM-light-8u92-installer.jar

mv $JAVA_HOME/jre/lib/amd64/server/libjvm.so $JAVA_HOME/jre/lib/amd64/server/libjvm.so.bkp
cp dcevm/linux_amd64_compiler2/product/libjvm.so $JAVA_HOME/jre/lib/amd64/server/libjvm.so.bkp

mkdir -p $JAVA_HOME/jre/lib/amd64/dcevm
cp dcevm/linux_amd64_compiler2/product/libjvm.so $JAVA_HOME/jre/lib/amd64/dcevm/libjvm.so

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#!/bin/bash

# Chrome Repo
sudo apt-get install fonts-liberation xdg-utils libxss1 libappindicator1 libindicator7
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo dpkg -i google-chrome*.deb

sudo apt-get update

# Download

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#!/bin/bash
#
# Bash script to setup headless Selenium (uses Xvfb and Chrome)
# (Tested on Ubuntu 12.04) trying on ubuntu server 14.04

# Add Google Chrome's repo to sources.list
echo "deb http://dl.google.com/linux/chrome/deb/ stable main" | sudo tee -a /etc/apt/sources.list

# Install Google's public key used for signing packages (e.g. Chrome)
# (Source: http://www.google.com/linuxrepositories/)

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#!/usr/bin/env bash
#              bash 4.1.5(1)     Linux Ubuntu 10.04               Date : 2013-07-11
#
# _______________|  netspeed : check download speed via command line.
#
#           Usage:  netspeed [tokyo, london, usw, use, east, west, URL]
#                                            ^default U.S. west coast.
#                            [ -speed_KB/sec ]
#                              ^negation activates the Mbps converter.
#

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OS X Preferences

---

most of these require logout/restart to take effect

# Enable character repeat on keydown
defaults write -g ApplePressAndHoldEnabled -bool false

# Set a shorter Delay until key repeat

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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

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Latency Comparison Numbers
--------------------------
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

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Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google

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Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results