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[platform-dev] Parallel Eclipse builds utilizing Java Builder and Maven Builder

Hi all,

I’m struggling to turn our Eclipse 4.12 to build multiple Java/Maven projects in parallel to speed up the overall time of compilation and to hopefully show that multi cores are getting utilized by Eclipse. We have workspaces with Java only projects, typically 9-30 projects with 150.000-340.000 LOCs.
 
I stumbled upon the presentation of parallel builds in Eclipse at the EclipseCon 2018 from Mickael Istria:
    https://de.slideshare.net/mickaelistria/parallel-builds-in-eclipse-ide-workspace-eclispecon-europe-2018
Mickael directed me to this mailing list.

Until now I had no success in seeing parallel builds. We invoke the Java and the Maven builder and the test plugin gives me a Gantt diagram, but there are no parallel builds at all, just the regular sequential build process. I think the test plugin works if automatic builds are disabled only, its the only situation where I’m getting the diagram file. Is the “default building order” necessary for the test plugin or am I wrong? Can I get any meaningful logs from Eclipse itself and/or the test plugin? The file ".metadata/.log" is a way too shy I think.

I'm willing to do a sort of hack to my Eclipse installation to prove that parallel builds are possible.

I do not find much information about parallel builds at all, so I may overlook something.

Any help or other suggestions are highly welcome.


Greetings from Germany,
Meik Piepmeyer, AEB SE

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