JDK-8270824 : SPECjvm2008 compress regression on x86 when +PreserveFramePointer
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 18
  • Priority: P4
  • Status: Closed
  • Resolution: Not an Issue
  • OS: linux
  • CPU: x86
  • Submitted: 2021-07-16
  • Updated: 2021-07-22
  • Resolved: 2021-07-22
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JDK 18
18Resolved
Related Reports
Relates :  
JDK-8268858 - Determine register pressure automatically by the number of available registers for allocation
Comments
False alarm. There's no regression.
22-07-2021
Sorry for the confusion. I wasn't asking about a +/-PreserveFramePointer comparison. I was asking about +PreserveFramePointer with INTPRESSURE set to 12 vs 13.
21-07-2021
I will make a clean new test with 18-b6 with +/-PreserveFramePointer and update you when it is done.
21-07-2021
I believe we are seeing a 5% regression. [~ecaspole], can you confirm, and help Joshua with the necessary configuration to reproduce?
16-07-2021
ILW = Performance regression in SPECjvm2008 compress on x86 with -XX:+PreserveFramePointer, only one platform and only one benchmark?, no workaround = MLH = P4
16-07-2021
Note from [~jzhu]: This issue (JDK-8270824) is to track "compress" regression with -XX:+PreserveFramePointer after JDK-8268858. There is another issue (JDK-8270808) marked as "Enhancement" used to track performance degradation in Flink Nexmark benchmark with -XX:+PreserveFramePointer found before JDK-8268858.
16-07-2021
Just now I ran six rounds of "compress" on x64 machine with "-XX:+PreserveFramePointer". Thread number of "compress" test is configured as 1 in my testing environment. See result at http://cr.openjdk.java.net/~jzhu/8269598/Book2_x86.pdf There is no regression in my testing.
16-07-2021