----- Original Message -----
From: "Yaniv Kaul" <ykaul@redhat.com> To: "Doron Fediuck" <dfediuck@redhat.com> Cc: engine-devel@ovirt.org, "<arch@ovirt.org>" <arch@ovirt.org> Sent: Wednesday, May 23, 2012 11:04:12 PM Subject: Re: [Engine-devel] Maven 3 here we come!
On 05/23/2012 12:59 PM, Doron Fediuck wrote:
Hi all, As discussed last month[1], we had to deal with some issues which turned out to be a Maven bug. Thanks to Juan and Asaf's work, our current sources now build properly using Maven 3. So you're all invited to migrate into Maven 3. Other than upgrading your local maven package no other action is needed.
For now, Maven 2 will also work for you, but I expect in the future we'd like to make use of some advanced features, so migration to 3 is recommended.
Talking about advanced features, an interesting challenge is feedback on parallel builds [2].
I'm not happy with parallel builds - it creates more java processes, each taking quite a bit of memory. This, in turn, causes them to swap, making everything crawl. Took me 22 minutes to compile the webadmin and additional 21 minutes for the user portal, with -T 4. I've had 3.5GB of swap used (and 7GB resident memory with 'java' processes running around). It usually takes me
The command line I've used was: mvn -T 4 clean install -Pgwt-admin,gwt-user -DskipTests=true -Dmaven.test.skip=true
Have you tried using the mvn -T 1C option (to run one thread per core?) On some builds it reduced my compilation time in a few min, but it wasn't consistent. also, maven says that some of the modules are not thread-safe and he will run then sequentially, so perhaps if the modules were re-factored to fit parallel builds, only then we'll see real improvement.
As opposed to 7+ 3 minutes without '-T 4'.
Y.
So whoever wants to try it out and report if it improves run time without breaking anything, will be appreciated.
Happy migration!
[1]http://lists.ovirt.org/pipermail/arch/2012-April/000490.html [2]https://cwiki.apache.org/MAVEN/parallel-builds-in-maven-3.html
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