[jboss-as7-dev] Parallel maven build: 33% improvement

[Paul Robinson]

All,

I tried telling maven to use all my cores (8 if you count hyper-threaded cores) and I've seen a 33% reduction in build times. Here's my results:

./build.sh clean install -DskipTests			3:43
./build.sh clean install -DskipTests -T 4		2:57
./build.sh clean install -DskipTests -T 8		2:30

I'm using an SSD, so YMMV.

However, there are 4 plugins that are not marked as @ThreadSafe, so i'm not sure how safe this is.

[WARNING] org.apache.maven.plugins:maven-help-plugin:2.2 (Can't find an issue for this yet)
[WARNING] org.codehaus.mojo:buildnumber-maven-plugin:1.2 (Claims to be fixed in 1.2: http://jira.codehaus.org/browse/MBUILDNUM-13)
[WARNING] org.codehaus.mojo:xml-maven-plugin:1.0 (Unresolved: http://jira.codehaus.org/browse/MOJO-1709)
[WARNING] org.kuali.maven.plugins:properties-maven-plugin:1.5.3 (Unresolved: http://jira.codehaus.org/browse/MOJO-1677)

For more info on parallel  maven builds:

https://cwiki.apache.org/MAVEN/parallel-builds-in-maven-3.html

Has anyone else experimented with this feature?

Paul.

-- 
Paul Robinson
Web Service Transactions Lead
paul.robinson at redhat.com

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