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https://issues.apache.org/jira/browse/LUCENE-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021591#comment-17021591
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Robert Muir commented on LUCENE-9160:
-------------------------------------

Also, if you have a machine with 16 cpus, and you are running with just 4 
runners, that is a misconfigured system: you are leaving 75% of your machine 
free. So it shouldnt be any surprise that background compilation (even if its 
some insane amount) causes you no problems: 75% of your resources are wasted.

Set the jvms to 16 if you want to do a comparison.

> override heap / jvm params for tests in gradle build
> ----------------------------------------------------
>
>                 Key: LUCENE-9160
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9160
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Major
>             Fix For: master (9.0)
>
>         Attachments: LUCENE-9160.patch, LUCENE-9160.patch
>
>
> Currently the gradle.properties that is generated lets you control the heap 
> and flags for the gradle build jvms.
> But there is no way to control these flags for the actual forked VMs running 
> the unit tests. For example, minHeap is hardcoded at 256m and maxHeap at 
> 512m. 
> I would like to change minHeap to 512m as well, for a fixed heap, and set 
> some other jvm flags, such as {{-XX:+UseParallelGC}} so that my tests are not 
> slow for silly reasons :)
> I think it is stuff jenkins CI would need as well. 



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