mina-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Pierre (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SSHD-164) Allow the buffer size for the IO pumps to be configurable in InvertedShellWrapper
Date Mon, 07 May 2012 07:58:11 GMT

     [ https://issues.apache.org/jira/browse/SSHD-164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pierre updated SSHD-164:
------------------------

    Description: 
InvertedShellWrapper uses by default a buffer of 512 bytes to copy the input/output/error
streams from the shell to the socket. For some applications, this is way too low, as for example,
copying 1MB from the process output to the socket is going to require in the 2048 loop iterations
in the IO pump thread.

For example, in our tests, switching the buffer size from 512 bytes to 32kBytes, on the transmission
of 830Mb leads to an improvement from 1m30s for the 512b buffer to 1m15s for the 32k buffer,
saving of 1/6th of the overall transmission time.

  was:
InvertedShellWrapper uses by default a buffer of 512 bytes to copy the input/output/error
streams from the shell to the socket. For some applications, this is way too low, as for example,
copying 1MB from the process output to the socket is going to require 2048 loop iterations
in the IO pump thread, and introduce a 2s of latency because of the 1ms sleep at the end of
each loop iteration.

Instead the buffer size should be configurable by the command factory.

    
> Allow the buffer size for the IO pumps to be configurable in InvertedShellWrapper
> ---------------------------------------------------------------------------------
>
>                 Key: SSHD-164
>                 URL: https://issues.apache.org/jira/browse/SSHD-164
>             Project: MINA SSHD
>          Issue Type: Improvement
>    Affects Versions: 0.6.0
>            Reporter: Pierre
>            Priority: Minor
>         Attachments: SSHD-164.patch
>
>
> InvertedShellWrapper uses by default a buffer of 512 bytes to copy the input/output/error
streams from the shell to the socket. For some applications, this is way too low, as for example,
copying 1MB from the process output to the socket is going to require in the 2048 loop iterations
in the IO pump thread.
> For example, in our tests, switching the buffer size from 512 bytes to 32kBytes, on the
transmission of 830Mb leads to an improvement from 1m30s for the 512b buffer to 1m15s for
the 32k buffer, saving of 1/6th of the overall transmission time.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message