[jboss-jira] [JBoss JIRA] (JGRP-2043) Improve performance of Message#readHeader
Bela Ban (JIRA)
issues at jboss.org
Thu Apr 14 08:05:00 EDT 2016
[ https://issues.jboss.org/browse/JGRP-2043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bela Ban updated JGRP-2043:
---------------------------
Fix Version/s: 4.0
> Improve performance of Message#readHeader
> -----------------------------------------
>
> Key: JGRP-2043
> URL: https://issues.jboss.org/browse/JGRP-2043
> Project: JGroups
> Issue Type: Enhancement
> Reporter: Sanne Grinovero
> Assignee: Bela Ban
> Priority: Minor
> Fix For: 4.0
>
>
> A CPU hot spot highlighed by profiling via JFR:
> {noformat}Stack Trace Sample Count Percentage(%)
> java.lang.reflect.Constructor.newInstance(Object[]) 71 2.392
> java.lang.Class.newInstance() 71 2.392
> org.jgroups.Message.readHeader(DataInput) 71 2.392
> {noformat}
> I'd have expected the reflective constructor to perform well on a recent JVM, but apparently it's not in this case. A theory is that the {{Class}} type being unknown makes this code harder to optimise; needs to be looked into.
> It might be possible to patch the {{ClassConfigurator}} to provide instances of the required {{Header}} type rather than returning the class, and optimise that instead.
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