compile time (was Re: [Engine-devel] Maven 3 here we come!)

[Eyal Edri]

----- Original Message -----
> From: "Itamar Heim" <iheim at redhat.com>
> To: "Yaniv Kaul" <ykaul at redhat.com>
> Cc: engine-devel at ovirt.org, "<arch at ovirt.org>" <arch at ovirt.org>
> Sent: Friday, June 1, 2012 7:02:51 PM
> Subject: compile time (was Re: [Engine-devel] Maven 3 here we come!)
> 
> On 05/23/2012 11:04 PM, Yaniv Kaul wrote:
> > 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
> >
> >
> > As opposed to 7+ 3 minutes without '-T 4'.
> 
> Saggi gave me his command line, which doesn't require any change of
> settings.xml
> 
> mvn clean install -Pgwtdev,gwt-admin -DskipTests
> -Dgwt.userAgent=gecko1_8 -Dgwt.draftCompile=true
> -Dgwt.compiler.optimizationLevel=0 -Dgwt.compiler.localWorkers=2
> -Dmaven.aspectj.incremental=true -Dmaven.aspectj.time=true

how much time this command cuts from build time? 
shouldn't we use this in CI as well?

> 
> I wonder if we shouldn't make something similar to this as the
> default.
> preferably, add ./configure script to tweak different options (which
> is
> very common in non java projects).
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