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Posted to dev@mina.apache.org by "Jonathan Valliere (Jira)" <ji...@apache.org> on 2021/12/02 14:33:00 UTC
[jira] [Commented] (DIRMINA-1152) IoServiceStatistics introduces huge latencies
[ https://issues.apache.org/jira/browse/DIRMINA-1152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452440#comment-17452440 ]
Jonathan Valliere commented on DIRMINA-1152:
--------------------------------------------
PRs are welcome
> IoServiceStatistics introduces huge latencies
> ---------------------------------------------
>
> Key: DIRMINA-1152
> URL: https://issues.apache.org/jira/browse/DIRMINA-1152
> Project: MINA
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.1.4, 2.1.5
> Reporter: Dmitrii Novikov
> Priority: Major
>
> Current implementation of IoServiceStatistics is blocking - it blocks on _throughputCalculationLock_ for almost all operations
> However, _IoServiceStatistics_ is used by all threads which writes to _IoSession_ and by all _NioProcessor_ threads.
> Blocking _IoServiceStatistics_ dramatically decreases performance in case of multithreaded writing to {_}IoSession{_}.
> Please, refer to my [benchmark|https://github.com/dmitriinovikov/apache-mina-benchmark] to ensure that it is so. The measurements are taken between the time the message was written to _IoSession_ by client and the time when it was actually sent to the server by _NioProcessor._ Latency percentiles are calculated for all messages except the first 20% - consider it as a warmup. You can read about benchmark details in the README file.
>
> My benchmark results:
> {code:java}
> # non-blocking IoServiceStatistics vs blocking IoServiceStatistics:
> p50: 85mcs vs 140mcs
> p75: 150mcs vs 400mcs
> p90: 239mcs vs 905mcs
> p95: 319mcs vs 1418mcs
> p99: 1311mcs vs 11485mcs {code}
>
> As a simple workaround solution, I would suggest to add an option to disable _IoServiceStatistics_ or replace it with custom implementation.
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