[infinispan-issues] [JBoss JIRA] (ISPN-6580) Hotrod performance regressions after ISPN-5342 ISPN-6545

[William Burns (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-6580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201674#comment-13201674 ] 

William Burns commented on ISPN-6580:
-------------------------------------

Removing the executor group and replacing with a single downstream only execution handler seems to get the rest of the get performance back in line.  Changes can be found at b6f214cb28fd250de9e31878acd709fbb99d1906

> Hotrod performance regressions after ISPN-5342 ISPN-6545
> --------------------------------------------------------
>
>                 Key: ISPN-6580
>                 URL: https://issues.jboss.org/browse/ISPN-6580
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Remote Protocols, Server
>            Reporter: Jakub Markos
>            Assignee: William Burns
>         Attachments: jfr_recordings.zip, pom.xml, Reproducer.java
>
>
> There were 2 recent regressions in hotrod performance, one between commits dd5501c5e and 628819461 and the second one between 628819461 and db0890270. I didn't look for the exact commits, so the name of the issue might not be 100% exact...
> It is easily reproducable locally with a single server instance, reproducer attached.
> The numbers on my machine:
> ||Build commit||Puts time||Gets time||
> |dd5501c5e|21|74|
> |628819461|26|102|
> |db0890270|48|224|
> The JFR recordings (attached, captured is only the part of the test with gets) for db0890270 show a lot of time is spent in HotRodDecoder#resetNow(), and also the allocation rate goes from 100MB/s for dd5501c5e to over 1GB/s for db0890270. There are no glaring differences between dd5501c5e and 628819461.



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