Re: [Engine-devel] Maven 3 here we come!
----- Original Message -----
From: "Yaniv Kaul" <ykaul(a)redhat.com>
To: "Doron Fediuck" <dfediuck(a)redhat.com>
Cc: engine-devel(a)ovirt.org, "<arch(a)ovirt.org>" <arch(a)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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