[jboss-jira] [JBoss JIRA] (JGRP-2043) Improve performance of Message#readHeader

[Sanne Grinovero (JIRA)]

Sanne Grinovero created JGRP-2043:
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             Summary: 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


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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