JDK-7036740 : Make stize of string table configurable
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 6u25
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic
  • CPU: generic
  • Submitted: 2011-04-14
  • Updated: 2011-04-14
  • Resolved: 2011-04-14
Related Reports
Duplicate :  
Description
Fusion apps spend ~10% of their time in string intern because they have such a large number of interned strings; the table gets too full and searching it becomes a huge bottleneck.

We have experimented with changing the size of the string table, and a larger table increases our performance by 7-10%. 

We are aware of the new property in JDK 7 for changing the size of the string table, but fusion apps will not be able to move to that release for quite some time. So in a sense, this is a request for a backport of 6962930 -- however, that bug is also tied into moving the string table into the heap (out of permgen). We don't need all of that -- if we can set the size of the string table within permgen at startup, that will be sufficient until we can move to JDK 7.

[Not sure about the subcategory here, but 6962930 is in this subcategory...]

Comments
EVALUATION Please see subCR for 6-pool for 6962930 and file an escalation on that subCR as appropriate.
14-04-2011