JDK-5074577 : Bad performance when HotSpot cannot optimize polymorphic calls
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 6
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_9
  • CPU: sparc
  • Submitted: 2004-07-15
  • Updated: 2005-09-28
  • Resolved: 2005-09-28
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Other JDK 6
5.0u8Fixed 6 b54Fixed
Related Reports
Relates :  
JDK-4803284 - Bad performance when HotSpot cannot optimize polymorphic calls
Description
Only the second suggested fix for the bug 4803284 was integrated into Tiger:

  "Don't generate stack overflow check when a compiled method doesn't have 
   java calls and has frame size < vm_page_size/8."

The first suggested fix required more time for investigation.
Comments
SUGGESTED FIX Webrev: http://analemma.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2005/20050920142945.kvn.5074577/workspace/webrevs/webrev-2005.09.20/index.html Add C2 product flag BimorphicInlining and set the default value to true. Save information about all known receivers from method_data in ciCallProfile. Sort the information by calls count. Inline (or direct call) second method if the call site is bimorphic and the flag BimorphicInlining is true. Set probability on dynamic class check based on the virtual call profile info. It shows double performance improvement on the original test cases from 4803284 but it doesn't improve our benchmarks scores. *** (#1 of 1): [ UNSAVED ] ###@###.###
21-09-2005
CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: mustang
17-07-2004
EVALUATION ###@###.### 2004-07-15 I have fix for this but need more time for testing. Committed to Mustang.
15-07-2004