concurrency model with Actor

Actor model everything is a Actor, natively concurrent.

Support in programming language 

Erlang: language level. Erlang is the best platform for concurrency and distributed application so far.

Python: library level.

• eventlet 
• why gevent
• Gevent: good, bad and ugly
• gevent tutorial

Java: library level. Akka

VisualVM remote monitoring JVM

JMX set up for JVM argument



-Dcom.sun.management.jmxremote.port=8086
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false

JVM GC tuning

HeapDump
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/home/blah/pid.hprof

install sun-jdk 6, 7 on Ubuntu 12.04

http://www.devsniper.com/ubuntu-12-04-install-sun-jdk-6-7/

sudo update-alternatives --config java

sudo update-alternatives --config javac

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1