[infinispan-issues] [JBoss JIRA] (ISPN-1918) Benchmark UNICAST vs UNICAST2 vs NAKACK2 with JGroups 3.0.x

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-1918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678294#comment-12678294 ] 

Dan Berindei commented on ISPN-1918:
------------------------------------

I also re-ran the state transfer simulation and these are the maximum latencies when transferring a 4.5MB state from each node to a single joiner:

||			|| UNICAST version|| FC || RSVP || 	2||	3||	4||
|jgroups-udp.xml|	1|	n|	n|	55|	946|	3344|
| | | 	y|	n|	76|	381|	952|
|jgroups-udp-unicast2.xml|	2|	n|	n|	N/A|	N/A|	N/A|
| | |	n|	y|	77|	955|	5016|
| | |	y|	n|	64|	5023|	10005|
| | |	y|	y|	78|	854|	1354|

UNICAST+FC is clearly the best, but state transfers happen seldom enough that an extra 500ms (as we see for UNICAST2+FC+RSVP) should not make a big impact.
Node that we had configured {{<RSVP resend_interval="500"/>}} - if we set the resend interval lower the UNICAST2+FC+RSVP would get even closer to UNICAST.
                
> Benchmark UNICAST vs UNICAST2 vs NAKACK2 with JGroups 3.0.x
> -----------------------------------------------------------
>
>                 Key: ISPN-1918
>                 URL: https://issues.jboss.org/browse/ISPN-1918
>             Project: Infinispan
>          Issue Type: Task
>          Components: RPC
>    Affects Versions: 5.1.2.FINAL
>            Reporter: Dan Berindei
>            Assignee: Dan Berindei
>              Labels: jgroups_tuning
>             Fix For: 5.1.3.CR1, 5.1.3.FINAL
>
>
> Recent changes seem to have brought performance a bit down, so we need to check whether this is caused by reverting to UNICAST instead of UNICAST2 (ISPN-1892).
> Performance has decreased most in the 2-node scenario, where we were actually sending multicasts instead of unicasts. So we need to check whether there is a performance difference between UNICAST2 and NAKACK2 as well.
> If we find UNICAST2 to perform better, we can proceed with ISPN-1879 on the 5.1.x branch as well as on the master branch.

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