John Dawson jdawsongit

README - Examples on using GNU Parallel

Suppose we want to compress (using bzip2) a number of log files.

Distrubute jobs to several threads on local machine. The commands (for each input file) are executed in current working directory.

ls *.log| parallel -j+0 bzip2 -9 '{}'

README

Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services, no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.

Let's create a example foo service that when started creates a file, and when stopped it deletes it.

Define setup/teardown actions

Create executable file /opt/foo/setup-foo.sh:

	<?xml version="1.0" encoding="UTF-8"?>
	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId></groupId>
	<artifactId></artifactId>
	<version>1.0.0-SNAPSHOT</version>

	log4j.rootLogger=INFO, CONSOLE

	# CONSOLE is set to be a ConsoleAppender using a PatternLayout
	log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
	log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
	log4j.appender.CONSOLE.layout.ConversionPattern=[%-5p] %m%n

	# a more detailed PatternLayout: %d [%t] %-5p %c - %m%n

	# adjust specific logger levels as per the need to control the verbosity of logs