RFR: JDK-8086056: ParNew: auto-tune ParGCCardsPerStrideChunk

[Tony Printezis]

Hi all,

A small patch for your consideration:

http://cr.openjdk.java.net/~tonyp/8086056/webrev.0/

(BTW, for some reason some of the webrev output is a bit messed up. Not sure why, maybe some hg incompatibility I guess. The diffs look OK though. I also attached the patch to this e-mail.)

There’s a bit of info on the JIRA on the rationale for the patch:

https://bugs.openjdk.java.net/browse/JDK-8086056

The min / max values for the old gen capacity and ParGCCardsPerStrideChunk were chosen empircally after running a few (mostly synthetic tests) on Linux x64. If someone has the cycles to do a more extensive performance study, I’d be happy to revise them accordingly.

Regards,

Tony

-----

Tony Printezis | JVM/GC Engineer / VM Team | Twitter

@TonyPrintezis
tprintezis at twitter.com

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