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https://issues.apache.org/jira/browse/SSHD-1153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17311971#comment-17311971
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Jonathan Valliere commented on SSHD-1153:
-----------------------------------------
The most obvious thing is that the NIO2 implementation will write to the socket
concurrently in the same thread that generates the message. The Apache Mina
and Netty adapters will both queue the message to be written asynchronously
later. AFAIK, given the single-threaded nature of SSH, it isn't an issue.
> NIO2 IOServiceFactory, NIO Worker Threads and the performance
> -------------------------------------------------------------
>
> Key: SSHD-1153
> URL: https://issues.apache.org/jira/browse/SSHD-1153
> Project: MINA SSHD
> Issue Type: Question
> Reporter: Susmit Sarkar
> Priority: Critical
> Attachments: image-2021-03-29-23-52-39-814.png,
> image-2021-03-29-23-54-01-301.png, image-2021-03-29-23-55-16-337.png,
> image-2021-03-29-23-55-33-299.png
>
>
> IoServiceFactoryFactory ==> *NIO2, MINA, NETTY*
> How does this works internally, and how performance will be affected with the
> different IoServiceFactoryFactory.
> We did lots of performance testing and found NIO2 is the best performing of
> the 3? Why is it the best of the other 2, and why Apache selects it as
> default. (Tested with 50-75 concurrent threads. Did 2 types of test *[1.] PUT
> for 1.5kb files for 75 concurrent threads [2.] PUT for 100 MB files for 40-50
> concurrent threads*)
> How do NIO Worker Threads affect the performance? Attaching a screenshot from
> the thread dump which I took
> !image-2021-03-29-23-52-39-814.png!
> All the threads in park state and some are runnable in different phases of
> execution. I am not able to decipher what does the stacks mean:
> The details which I got are (*PARKED*):
> !image-2021-03-29-23-54-01-301.png!
> For *RUNNABLE:*
> *!image-2021-03-29-23-55-33-299.png!*
> *Lastly, I want to bring this to notice not all threads are used out of 75
> threads I see 50 to be in runnable and the remaining 25 to be in the parked
> state, is it the expected behavior?*
>
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