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http://jira.codehaus.org/browse/MNG-3004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=159982#action_159982
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Nigel Magnay commented on MNG-3004:
-----------------------------------
My original intent was so that all activities could run in parallel, to the
granularity of a particular project.
I.E if projects A B and C all depend on project X (and nothing else), then
after 'mvn install' finishes on 'X', 'mvn install' can be executed, in
parallel, on each of A, B and C.
I stopped trying to get it to work when I realised that the biggest problem is
that the local repository isn't safe to be accessed from multiple threads (or
even multiple processes for that matter). I think that's a known issue too -
I'm guessing that the ability to somehow lock/unlock repository objects (or
perhaps use some kind of smarter local repository) is a dependency to getting
this to work.
> Allow build lifecycle to execute tasks in parallel
> --------------------------------------------------
>
> Key: MNG-3004
> URL: http://jira.codehaus.org/browse/MNG-3004
> Project: Maven 2
> Issue Type: Improvement
> Components: Bootstrap & Build, General, Performance
> Affects Versions: 2.0.6
> Reporter: Nigel Magnay
> Fix For: 2.1.0-M3
>
> Attachments: parallel-builds.patch
>
>
> One of the great advantages with maven over scripted build environments is
> that it can calculate the dependencies of the build, and it could execute
> items that are independent of each other in parallel.
> Unfortunately it currently doesn't do this, which would be a big win over
> tools such as 'ant'. It also means that multicore machines have lots of idle
> capacity when running a serial build that could be utilised.
> I had a quick shot at seeing what might be required. Bear in mind this is the
> first time I have looked at maven internally, and I was just trying to feel
> my way around and build a POC. I got some of the way there, but my build
> threads don't seem to have the correct classpath - I think this is something
> to do with plexus / classworlds - but I don't know enough.
> It'd be great to get this feature in a future version, or a way of running my
> hack (figuring out why in a thread has not the plexus stuff) in the interim.
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