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

[Tomaž Cerar]

I do experiment lots with this feature :-)

also reason why we currently have just 4 non @ThreadSafe plugins in our
build...

Only problem I found with this was that arquillian tests usualy behave
quite strange.
so if you do paralel build with -DskipTests then this is great but for
actual testing it is not that good.
I usually do -DskipTests -T4 and then just run part of testsuite that i am
interested in.


Also you can use -T 4C which will tell him to use 4 real cores not just
logical ones.
But this config really depends on project & hardware you are on.

--
tomaz




On Mon, Mar 25, 2013 at 4:17 PM, Paul Robinson <paul.robinson at redhat.com>wrote:

> 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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