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https://issues.apache.org/jira/browse/SSHD-1153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320101#comment-17320101
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Susmit Sarkar commented on SSHD-1153:
-------------------------------------
[~johnnyv] - I was checking through the thread dumps. I found out *5 Nio2
worker* threads, (1+cores in my machine), and I opened parallel 100 ssh
connections, all those 100 ssh connections were being triggered by the 100
individual thread
*sshd-SftpSubsystem-thread-1*
*My question for my knowledge is:*
# *What are the NIO2 worker threads, and how do they differ from*
*sshd-SftpSubsystem-thread-1, as we see most of the work is done by the latter
then what is the role of nio-worker thread***
# *Does increase the performance to 9,10 will increase the throughput (we
tried but we didn't found any negligible changes, what will be the best optimum
value recommended to be used?)*
# *What are the*
IoServiceFactoryFactory ==> *NIO2, MINA, NETTY*
How does this works internally, and how performance will be affected with the
different *IoServiceFactoryFactory*.
*I am sorry if I am disturbing you as I am not getting proper docs on how it's
working internally so thought of asking you.*
*On a small note we are seeing an improvement of 20 percent compared to legacy
maverick server with Apache Mina Library.*
Shall be grateful if you can help with the above answers.
> 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
> Assignee: Jonathan Valliere
> Priority: Minor
> 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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