Dmitrii created DIRMINA-1152:
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Summary: 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
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.
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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