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https://issues.apache.org/jira/browse/LUCENE-9165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17022147#comment-17022147
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Erick Erickson commented on LUCENE-9165:
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+1 for changing it.

Meanwhile I think you can override this (and other settings) in 
~/.gradle/gradle.properties without polluting your checkout.

> change generate-defaults.gradle not to cap testsJvms at 4
> ---------------------------------------------------------
>
>                 Key: LUCENE-9165
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9165
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Major
>
> {code}
>       def cpus = Runtime.runtime.availableProcessors()
>       def testsJvms = (int) Math.max(1d, Math.min(cpus * 0.5d, 4))
> {code}
> Dividing by 2 is still good (hyperthreading is still a thing), but the 
> artificial cap of 4 is a bottleneck if the hardware has more available.



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