JDK-8296931 : NMT tests slowed down considerably by JDK-8242181
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 20
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2022-11-14
  • Updated: 2024-06-14
  • Resolved: 2022-11-16
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JDK 20
20 b24Fixed
Related Reports
Relates :  
JDK-8242181 - [Linux] Show source information when printing native stack traces in hs_err files
Relates :  
JDK-8333994 - NMT: call stacks should show source information
Description
We noticed that NMT tests on our slower PPC machines started failing.

The reason is that NMT detail reports have become 2-5x slower. This is caused by us now parsing the dwarf debug information to extract source information for each PC in each call stack. That is nice but costly.

The slowdown is not limited to PPC, it affects all Elf platforms. On my Linux x64 box, runtime/NMT/VirtualAllocCommitMerge.java increased from 20 to 90 seconds.
Comments
Changeset: 5e08b3f4 Author: Thomas Stuefe <stuefe@openjdk.org> Date: 2022-11-16 08:51:47 +0000 URL: https://git.openjdk.org/jdk/commit/5e08b3f40e04254276fc2d37c523cb06b121861a
16-11-2022
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/11135 Date: 2022-11-14 12:43:41 +0000
14-11-2022