[jboss-jira] [JBoss JIRA] (JGRP-1717) Bundling reduces performance in scenario mimicking Inifinispan

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922276#comment-12922276 ] 

Bela Ban commented on JGRP-1717:
--------------------------------

Investigate idea by [~rvansa]:

As a last thought for DefaultBundler2 principle (this is the one I find most appealing): It seems to me that the thread does not do much work in the lock, so the bundle does not grab much messages. The format of batch does not specify how many messages will there be in advance, so, instead of just adding the message to list (fast), couldn't we keep the DataOutputStream and write the message to the stream?

Potential issues:
* We don't know up front whether the batch has 1 or more messages; in case of 1 message we send a single message, otherwise we send a batch. However, the wire format is different
* We'd have to associate one output stream per target destination
                
> Bundling reduces performance in scenario mimicking Inifinispan
> --------------------------------------------------------------
>
>                 Key: JGRP-1717
>                 URL: https://issues.jboss.org/browse/JGRP-1717
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.3
>            Reporter: Radim Vansa
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>         Attachments: benchmark-jgroups.xml, jgroups-udp.pdf, jgroups-udp.xml
>
>
> In Radargun benchmark of JGroups mimicking the behaviour of Infinispan we can see that performance with bundling on actually reduces the performance.
> See attached configurations and results.

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