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https://issues.apache.org/jira/browse/LUCENE-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021568#comment-17021568
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David Smiley commented on LUCENE-9160:
--------------------------------------

While this change might improve Lucene tests (I didn't check yet), I'm finding 
this to be a large depredation in Solr tests.  A machine I use to run tests 
normally takes around 38 minutes but is now taking 52 minutes.  It's a 
corporate VM that supposedly has 16 CPUs; "ant test" uses 4 runners.  I passed 
"-Dargs=" to undo the change args change and I'm back to normal test run times.

> 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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