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From "Alexey Petrenko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-642) Performance improvement for HashMap and LinkedHashMap classes
Date Thu, 07 Dec 2006 11:40:23 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-642?page=all ]

Alexey Petrenko updated HARMONY-642:
------------------------------------

    Patch Info: [Patch Available]

> Performance improvement for HashMap and LinkedHashMap classes
> -------------------------------------------------------------
>
>                 Key: HARMONY-642
>                 URL: http://issues.apache.org/jira/browse/HARMONY-642
>             Project: Harmony
>          Issue Type: Improvement
>          Components: Classlib
>            Reporter: Vladimir Strigun
>         Assigned To: Tim Ellison
>            Priority: Minor
>         Attachments: Harmony-642.diffs
>
>
> I'd like to suggest performance improvement for HashMap and LinkedHashMap classes. The
patch gives about 6% for DaCapo:fop benchmark and do not degraded on other benchmarks. This
patch covers the following issues:
> -	removed duplicate call of hashCode() method 
> -	method findEntry was divided to findNullKeyEntry() and findNotNullKeyEntry() 
> -	method getModuloHash() was inlined.
> Also, I'd like to share with you results of DaCapo execution on J9+classlib (values are
in milliseconds):
> Build		Dacapo: fop	Dacapo: hsqldb	Dacapo: xalan	Dacapo: chart	
> jdk		774.567		29332.039	                     4437.278	31260.598	
> jdk-UtilFix	                     723.518		28518.381	                     4369.438	31690.724


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