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

[Itamar Heim]

On 06/02/2012 12:00 PM, Eyal Edri wrote:
>
>
> ----- 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 get a 3.5 minutes build with this.

with the exception of skipTests which in some jobs you want to run - 
yes. also -Pgwt-user is relevant to some jobs.
(and if this becomes more of the default compile mode, you would need to 
tweak it only when you need to)

>
>>
>> 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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