java.awt event processing performance degradation on JRE7 (original) (raw)

David Holmes david.holmes at oracle.com
Mon Apr 16 19:03:37 PDT 2012

This sounds like it may be related to an issue that was reported a while ago. I don't recall the exact details but there was some massive array being allocated if I recall correctly. The fix was to add a guard to the logging calls in the AWT code. But in this case if logging is being used then you will hit this overhead.

Sorry I don't recall enough details to find an exact reference. Skimming a number of mailing list archives hasn't turned it up either.

David

On 16/04/2012 11:18 PM, Daniel D. Daugherty wrote:

java.util.logging is currently handled by the Serviceability Team. Adding that alias to this e-mail thread...

Dan

On 4/16/12 12:17 AM, Nicolas Carranza wrote: Moving the mouse pointer over a java.awt.Window using JRE7 consumes aprox. twice the CPU time as with JRE6 when logging is used (when a call to java.util.logging.getLogger(String)---even without using the returned Logger--- has been done). Keyboard key event processing suffers the same performance penalty. For steps to reproduce this problem please look at: http://www.java.net/forum/topic/performance/general-performance-discussion/jre7s-javaawt-performance-degradation-caused-javautillogging-linux

. The performance degradation seems to be "enabled" by the call of sun.util.logging.PlatformLogger.redirectPlatformLoggers() done inside java.util.LogManager.readPrimorialConfiguration() on JRE7. Call chain: Logger.getLogger()->LogManager.getLogManager()-> LogManager.readPrimordialConfiguration()->sun.util.logging.PlatformLogger.redirectPlatformLoggers().

This call is not made on JRE6. If this problem is not easy to solve then I guess is better to remove this call from JRE7's readPrimordialConfiguration as it does more harm than good. Please let me know if there is a better place to report this problem. A couple of weeks ago I "opened" a bug report on bugs.sun.com but I received no response at all. Cheers, Nicolas

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