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From "Vladimir Strigun (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-642) Performance improvement for HashMap and LinkedHashMap classes
Date Thu, 22 Jun 2006 10:05:29 GMT
Performance improvement for HashMap and LinkedHashMap classes
-------------------------------------------------------------

         Key: HARMONY-642
         URL: http://issues.apache.org/jira/browse/HARMONY-642
     Project: Harmony
        Type: Improvement

  Components: Classlib  
    Reporter: Vladimir Strigun
    Priority: Minor


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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