JDK-8324223 : J2dBench-vimg_copyarea regressions after JDK-8321619
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 22
  • Priority: P4
  • Status: Closed
  • Resolution: Not an Issue
  • OS: windows
  • CPU: x86_64
  • Submitted: 2024-01-19
  • Updated: 2024-12-05
  • Resolved: 2024-01-23
Related Reports
Relates :  
JDK-8321619 - Generational ZGC: ZColorStoreGoodOopClosure is only valid for young objects
Description
Benchmark regressions after the introduction of JDK-8321619 in 22+29:

-5% J2dBench-vimg_copyarea-ZGC    on Windows-x64
-3% J2dBench-vimg_copyarea-ParGC on Windows-x64
-2% J2dBench-vimg_copyarea-G1       on Windows-x64

Regressions were isolated to jdk-22+29-2281 by measuring CI builds.
jdk-22+29-2281 only includes JDK-8321619.
Comments
Thanks for the feedback.. will have to write this off as some indirect effect no related to the changeset. Will close as not a bug
23-01-2024
> Is any of this code shared between ZGC and gen-ZGC? It's not. The changed code only affects Generational ZGC.
22-01-2024
Yes, I assumed that. And I don't know what to say -- the data from the isolation run clearly show there's some affect. The biggest impact was on ZGC config. Is any of this code shared between ZGC and gen-ZGC?
19-01-2024
[~resii] The listed JDK-8321619 only changes Generational ZGC. None of the listed GCs above test Generational ZGC.
19-01-2024