JDK-6903284 : Data read from system cache should be also cached in the memory cache
  • Type: Bug
  • Component: deploy
  • Sub-Component: deployment_toolkit
  • Affected Version: 6u18
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2009-11-20
  • Updated: 2013-11-01
  • Resolved: 2010-01-13
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.
JDK 6 JDK 7
6u18 b06Fixed 7Fixed
Related Reports
Relates :  
JDK-6894899 - use preverified runtime from system cache if available
Description
Cache.getSystemCacheEntry() does not use memory cache and therefore cache entries from the system cache 
are always read from the disk (or disk cache). This has negative impact on performance.
Comments
SUGGESTED FIX http://sa.sfbay.sun.com/projects/deployment_data/6u18/6903284.1
24-11-2009
SUGGESTED FIX http://javaweb.sfbay.sun.com/~in81039/6903284/
21-11-2009
EVALUATION As part of FX startup optimizations in 6u18 FX runtime is now imported in the "system" cache and we use special optimized classloader to load runtime from the system cache. In b05 (6894899) this code was refactored to make sure we only allow system cache entries to be loaded to the "optimized" FX classloader. However, this codepath skips use of MemoryCache and therefore every time we need jar (e.g. to load new class) we read cache entry from the disk (disk cache but we still need to load and parse it). For example this happens 650 times on startup of Store app. Other problem fixed as part of this bug fix is to recover support for use of "alternative" runtimes - this is needed for performance tracking with Soma promoted builds. Perf tests shows that with fix startup performance for minimal fx applet improves by 10+% (this will likely return us to b04 level only).
21-11-2009