[jboss-jira] [JBoss JIRA] (JGRP-1722) Improve performance of ENCRYPT protocol

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12949811#comment-12949811 ] 

Bela Ban commented on JGRP-1722:
--------------------------------

I tried the following:
# Decryption of the messages of a batch in parallel, using a thread pool. If the decryption cost of a message (assuming similar-sized messages) is 2ms, then decrypting a batch of 10 messages would take 20ms if done sequentially, while it would take ~2ms if done in parallel. Of course, we're assuming here that we have 10 threads available and the cost of context switching is negligible
# Use of the asynchronous invocation API to dispatch requests. Every request is handled by a thread from a thread pool (in UPerf) and sending the response as well. The response sending includes encryption of the response, so this cost is amortized by doing this in parallel

I tested performance on my local box, my (fast) mac and the lab cluster (8 UPerf instances), and it wasn't better than the sequential algorithm. Possible causes: only half of the messages are actually message batches, the average batch size is small (I verified that they avg is ~ 3.5), and the additional thread context switching caused by the pools diminishes the returns gained by parallelization
                
> Improve performance of ENCRYPT protocol
> ---------------------------------------
>
>                 Key: JGRP-1722
>                 URL: https://issues.jboss.org/browse/JGRP-1722
>             Project: JGroups
>          Issue Type: Enhancement
>    Affects Versions: 3.4
>            Reporter: Martin Gencur
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>
> A stress tests with the following setup showed that performance (reads and writes/sec) is halved when ENCRYPT protocol is enabled:
> Infinispan had distributed sync cache with 2 owners on 4 nodes, no transactions. The stress test used 10 threads on each node accessing 1024 byte entries, no conflicts on keys, 20 % writes, 80 % reads. 
> It would be great if we could improve the performance of ENCRYPT protocol.

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