kirkch

package com.mosaic.esa;

import javassist.util.proxy.MethodHandler;
import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyObject;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import org.junit.Test;

kirkch

import java.io.*;
import java.nio.*;
import java.nio.channels.*;

/**
 * Compares the performance of streaming data to disk vs using memory mapped files.
 *.
public class MappedIO {
    private static int numOfInts = 4000000;

kirkch

Use this when the Java 5 dir/* syntax does not work. This hit me using Gatling on Ubuntu recently.

CLASSPATH="$(echo $GATLING_HOME/lib/*.jar | tr ' ' ':'):$GATLING_CONF:${JAVA_CLASSPATH}"

kirkch

-- RSync server config ( /etc/zeebox/rsync.conf

lock file = /var/run/rsync.lock
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid

[cache]
    path = /mnt/cache
    uid = tomcat
    gid = tomcat

kirkch

Verification
Check your system limits:

$ cat /proc/sys/fs/file-max
$ sysctl -a |grep fs.file-max


To check the number of file descriptors used by any given process use 

$ ls -la /proc/<pid>/fd

kirkch

find . -maxdepth 1 -type f ! -name `*.gz` -exec gzip "{}" \;

kirkch

Native Compilation Options
-----------------------

XX:+PrintCompilation        Prints out when HotSpot stops the world to compile a method into native code
-XX:CompileThreshold=1000   Sets the number of invocations required before a method will be considered for compilation.
                            Trades off startup time and resources for speed. -client sets this to 1500, -server runs with 10,000