ChrisHegarty commented on PR #13351:
URL: https://github.com/apache/lucene/pull/13351#issuecomment-2102236939

   > The reason for the jvmargs is to not enable C2 for our short running tests 
with lots of randomization. This causes dramatic overhead (Robert tested this) 
on total test runtime. So we use the default C2 JVM settings only on CI, where 
50% longer total runtime does not matter.
   
   Yes, I get this. I was thinking that running vector tests with Panama Vector 
enabled and C2 disabled will be slow, but it seems to make little difference - 
I guess we don't have very stressful tests in this area. 
   
   I'll revert my latest change, so that C2 will be disabled regardless of 
Panama Vector. Then merge and backport.
   
   


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