JDK-6949933 : SerialGC outperforms ParallelGC on a server class machine for a Tomcat/Xythos/webdav application
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 6u18
  • Priority: P4
  • Status: Closed
  • Resolution: Won't Fix
  • OS: solaris_10
  • CPU: sparc
  • Submitted: 2010-05-05
  • Updated: 2014-04-08
  • Resolved: 2013-04-26
Related Reports
Relates :  
JDK-8005792 - Long GC Pause Times When Opening Large Flight Recording in JMC
Description
This is Tomcat test with a Xythos webdav application running in a "one socket, quad-core, 8 virtual CPU" SPARC-VII zone.  50 users, uploading 3 different file sizes (100K, 512K, 1M) but the same file every time.  Its a very simple load (though its not trivial to recreate the environment). 

Time in seconds for upload: (100kb / 512kb / 1024kb) 
  2.410 / 3.036 / 4.248 with PS Scavenge & PS MarkSweep
  1.774 / 2.386 / 3.488 with PS Scavenge & PS MarkSweep & Ergonomics Disabled
  1.481 / 2.090 / 3.139 with SerialGC
Comments
8005792 pertains to a case where the old gen serial mark-sweep-compact runs faster than the ParallelOld code.
26-04-2013
The data in this report is old. Closing this bug now. We can open a new bug if we have more recent data that suggest that this is still an issue.
26-04-2013