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https://issues.apache.org/jira/browse/SSHD-1217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17432424#comment-17432424
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Roberto Deandrea commented on SSHD-1217:
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Hi Thomas,
I tried your suggested parameter setting the system property
*-Dorg.apache.sshd.config.sftp-max-readdir-data-size=65536* (deault 16*1024) **
but the performance was almost the same. No improvement with this setting.
I also tried the following settings :
*-Dorg.apache.sshd.config.sftp-fs-read-buffer-size=32768* (default 8192)
*-Dorg.apache.sshd.config.sftp-fs-write-buffer-size=32768* (default 8192)
*-Dorg.apache.sshd.config.sftp-channel-copy-buf-size=32768* (default 8192)
but no improvement happen listing folder with 2000+ files.
Putting or getting a file has no significant performance impact respect a
forward Apache SSHD connection, only l+isting files+ is impacted in the
scenario.
Checking traces on the frontend Apache SSHD server it seems that the embedded
sftp client into the remote file system read a single file from the folder of
the backend Apache SSHD server.
Q1. Is this a correct behaviour ?
Q2. Any other ideas or actions to be carried out to improve this slow
performance ?
Thanks in advance for your cooperation
Kind Regards
Roberto
> Slow performance listing huge number of files on Apache SSHD server
> -------------------------------------------------------------------
>
> Key: SSHD-1217
> URL: https://issues.apache.org/jira/browse/SSHD-1217
> Project: MINA SSHD
> Issue Type: Improvement
> Affects Versions: 2.6.0
> Reporter: Roberto Deandrea
> Priority: Minor
> Attachments: trace.frontend.sshd.log.zip
>
>
> Hi Thomas,
> I noted slow performance listing files on the front-end Apache SSHD server in
> the same scenario as https://issues.apache.org/jira/browse/SSHD-1215
> The front-end Apache SSHD server is configured with a Filesystem built upon
> SFTPFileSystemProvider to proxy files to an Apache SSHD back-end server.
>
> In the /inbox folder of the Apache SSHD backend server I have 2000 files.
> The client sftp ls commands take 2 secs on the backend Apache SSHD server,
> instead it takes about 48 secs on the front-end Apache SSHD server.
> For greater number of files in the /inbox folder times are getting worse.
>
> I have full traces of sftp list commands to front-end Apache SSHD server
> that is attached to this jira.[^trace.frontend.sshd.log.zip]
> I looked through the traces on the front-end server and it seems to me that
> for every files in the folder the sftp client on the front-end server creates
> a SSH_MSG_CHANNEL_DATA generating tcp traffic that slow down the performance
> of the list command.
> Obviously this does not happen when a sftp client connects directly to the
> backend Apache SSHD server.
> Can you take a look at traces on the front-end Apache SSHD server ?
> Do you think it's possbile change something to improve performance of list
> files in this situation ?
>
> Thanks in advance
>
> Kind Regards
> Roberto
>
>
>
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