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[jdt-dev] Can JDT builder run in parallel in same instance?

Hi all,

I'm investigating https://bugs.eclipse.org/bugs/show_bug.cgi?id=531554 to make JDT not blocking potential parallel builds. Since JDT build seems already pretty optimized, I don't expect a lot of improvement in JDT itself with parallelism, however, I think it makes sense to at least investigate its schedulingrule so it wouldn't block other builders which are able to take advantage of parallel executions.
I've tried to just set the rule to "getProject()" so builds can run in parallel and didn't notice any issue.
That said, I'm not confident about this result being enough here. Does anyone know whether the JavaBuilder is expected to run in parallel, or whether it's known to be impossible to run in parallel for some reason? If the later, can someone please elaborate about the reasons so we can probably refine the scheduling rule?

Thanks in advance

--
Mickael Istria
Eclipse IDE developer, at Red Hat Developers community
Elected Committer Representative at the Eclipse Foundation board of directors

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