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https://issues.apache.org/jira/browse/SSHD-1169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17347128#comment-17347128
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Guillaume Nodet commented on SSHD-1169:
---------------------------------------
It would help a lot if you could set up a unit test that we could run in our
build to actually replicate and debug the problem.
> Sftp Server throughput is lagging for concurrent threads
> --------------------------------------------------------
>
> Key: SSHD-1169
> URL: https://issues.apache.org/jira/browse/SSHD-1169
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 2.5.1
> Reporter: Susmit Sarkar
> Priority: Blocker
> Attachments: image-2021-05-18-20-10-43-416.png,
> image-2021-05-18-22-37-08-832.png
>
>
> Hello Team,
> We are seeing a considerably low throughput for large-sized file (100Mb sized
> file during concurrent execution)
> We did some load testing and the throughputs sometimes increase (when we do a
> VM reboot for 1st run) and sometimes its pretty low compare to commercial
> servers
>
> *2000 cycle runs | 20 concurrent threads | 100mb files == Throughput is 0.94
> documents per seconds*
> For a commercial server (like Maverick), it's around 1.17 documents per
> second.
> Now if we do a server reboot and re-execute the test then the throughput
> increases by leaps and bounds
> *2000 cycle runs | 20 concurrent threads | 100 MB files == Throughput is 1.90
> documents per seconds (More than 100 percent)*
> *cycle means 100 MB file upload times, 2000 means 2000times*100 MB which got
> distributed by 20 concurrent sftp sessions*
> I am using IO Factory as NIO2, and below are the combinations for different
> NIO worker threads
> !image-2021-05-18-22-37-08-832.png!
> We are pretty confused and need help. For small files, Apache performed very
> well the throughput was 30 percent better than Maverick, but for large files,
> we are seeing these issues sometimes (mostly with reboot it performs good,
> but after that run its starts lagging)
> nio-workers ===> *varies from the chart above*
> max-auth-requests ===> 3
> Compression ===> NONE
> max-concurrent-sessions ===> 2147483647
> packet-size ===> 65536
> idle-timeout ===> 300000
> server-identification ===> SFTP Server
> window-size ===> 4194304
> we are setting currently all this properties to *SshServer*, is there any
> performance tuning parameter can be used?
>
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