JDK-8015268 : NPG: 2.5% regression in young GC times on CRM Sales Opty
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs25
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2013-05-23
  • Updated: 2013-06-11
  • Resolved: 2013-05-29
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JDK 8 Other
8Fixed hs25Fixed
Related Reports
Relates :  
JDK-8015422 - Large performance hit when the StringTable is walked twice in Parallel Scavenge
Description
Collect&analyze has showed this to be because of the extra ClassLoaderDataGraph scanning, which has been added to the ScavengeRootsTask::_system_dictionary task.
Comments
Fix is out for review: http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013-May/007353.html
28-05-2013
The _system_dictionary task already caused load balancing issues for this benchmark, adding more work to that task didn't help. The suggested fix is to split the task into two tasks, one for the system dictionary and one for the class loader data graph. We might also want to reorder the tasks to make sure that we don't run these length tasks at the end of the root scanning.
23-05-2013