JDK-8255705 : Regression ~1% in MPEG apparently after JDK-8255000
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 16
  • Priority: P3
  • Status: In Progress
  • Resolution: Unresolved
  • Submitted: 2020-10-30
  • Updated: 2021-06-08
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8255000 - C2: Unify IGVN processing when loop opts are over
Description
I manually tracked this down to intermediate build 1199.
Seen on Linux, Mac and Windows.
Comments
JDK-8255120 recovered part of the slowdown (at least, half of it): jdk-16.latest 150.391 +- 0.361 ops/min jdk-16.8255120 151.212 +- 0.356 ops/min jdk-16+20 152.267 +- 0.378 ops/min jdk-16+21 150.343 +- 0.294 ops/min
14-01-2021
Priority should be higher: ILW = Slight performance regression (regression in JDK 16), with standard benchmark, no workaround = MMH = P3
17-11-2020
Vladimir, could you please have a look?
02-11-2020