JDK-8323791 : Parallel: Using non-atomic for live bytes update during Full GC
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 23
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • Submitted: 2024-01-16
  • Updated: 2024-02-09
  • Resolved: 2024-02-09
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tbdResolved
Related Reports
Duplicate :  
JDK-8325553 - Parallel: Use per-marker cache for marking stats during Full GC
Relates :  
JDK-8320165 - Parallel: Full GC code is very slow due to quadratic calc_new_address
Description
In `PSParallelCompact::mark_obj`, `_summary_data.add_obj` uses atomic-operation to record live bytes info, which hinders scalability during Full GC.
Comments
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/17442 Date: 2024-01-16 10:41:13 +0000
16-01-2024
One can use the attached simple program to illustrate the scalability problem.
16-01-2024