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adgon92 / java_tips.txt

Created February 26, 2017 20:25

Java tips

	1. String Deduplication of G1 Garbage collector to Save Memory from Duplicate String in Java 8
	String deduplication is not enabled by default in Java 8 JVM. You can enable String deduplication feature
	by using -XX:+UseStringDeduplication option. Unfortunately, String deduplication is only available for the
	G1 garbage collector, so if you are not using G1 GC then you cannot use the String deduplication feature.
	It means just providing -XX:+UseStringDeduplication will not work, you also need to turn on G1 garbage collector
	using -XX:+UseG1GC option. String deduplication also doesn't consider relatively young String for processing.
	The minimal age of processed String is controlled by -XX:StringDeduplicationAgeThreshold=3 option.
	The default value of this parameter is 3.

adgon92 / Install_python.sh

Last active February 26, 2017 21:10

Install python 3.6 as a side python version on Ubuntu

	#/bin/bash

	sudo apt-get update
	sudo apt-get upgrade
	sudo apt-get dist-upgrade
	sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
	sudo apt-get install build-essential libncursesw5-dev libgdbm-dev libc6-dev
	sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev libbz2-dev libreadline6-dev ncurses-dev
	sudo apt-get install tcl-dev tk-dev python-tk python3-tk blt-demo tix python-tk-dbg python3-tk-dbg
	sudo apt-get install libssl-dev openssl

adgon92 / install_java.sh

Last active February 18, 2017 16:49

Install java

	wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.tar.gz
	sudo mkdir /opt/jdk
	tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk
	ls /opt/jdk
	update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_05/bin/java 100
	update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_05/bin/javac 100
	java -version

	update-alternatives --install /usr/bin/java java /opt/jdk/jdk.new.version/bin/java 110
	update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk.new.version/bin/javac 110

adgon92 / install_opencv.sh

Last active February 18, 2017 17:11

OpenCV 3.1 installation on Ubuntu

	# KEEP UBUNTU OR DEBIAN UP TO DATE

	sudo apt-get -y update
	sudo apt-get -y upgrade
	sudo apt-get -y dist-upgrade
	sudo apt-get -y autoremove

	#INSTALL THE DEPENDENCIES

Adam adgon92