[
https://issues.apache.org/jira/browse/SSHD-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210240#comment-17210240
]
Lyor Goldstein edited comment on SSHD-1090 at 10/8/20, 2:15 PM:
----------------------------------------------------------------
{quote}
Maverick Legacy SFTP server has the below api:
...
Is there any API simliar to the same functionality in APACHE Mina sshd library?
If not then how to achieve the same functionality in sshd
{quote}
I am not familiar with _Maverick_ framework and it is difficult to understand
what the functionality you describe does exactly. In any case, SSHD uses a
thread pool - though it depends on the {{IOServiceFactory}} being used.
Assuming the default (NIO2) there is a configuration value called
{{nio-workers}}:
{code:java}
/**
* Number of NIO worker threads to use.
*/
public static final Property<Integer> NIO_WORKERS
= Property.validating(Property.integer("nio-workers",
Runtime.getRuntime().availableProcessors() + 1),
w -> ValidateUtils.checkTrue(w > 0, "Number of NIO workers
must be positive: %d", w));
{code}
This value can be used to tune the concurrency level of the thread pool -
however
* It is +constant+ - i.e., cannot grow/shrink dynamically.
* It is +global+ - has nothing to do with SFTP or SCP or any other sub-protocol
but rather with the SSH server as a whole.
Note that having a large thread pool does not necessarily improve throughput
since there is a context switch overhead.
was (Author: lgoldstein):
{quote}
Maverick Legacy SFTP server has the below api:
...
Is there any API simliar to the same functionality in APACHE Mina sshd library?
If not then how to achieve the same functionality in sshd
{quote}
I am not familiar with _Maverick_ framework and it is difficult to understand
exactly what the functionality you describe does exactly. In any case, SSHD
uses a thread pool - though it depends on the {{IOServiceFactory}} being used.
Assuming the default (NIO2) there is a configuration value called
{{nio-workers}}:
{code:java}
/**
* Number of NIO worker threads to use.
*/
public static final Property<Integer> NIO_WORKERS
= Property.validating(Property.integer("nio-workers",
Runtime.getRuntime().availableProcessors() + 1),
w -> ValidateUtils.checkTrue(w > 0, "Number of NIO workers
must be positive: %d", w));
{code}
This value can be used to tune the concurrency level of the thread pool -
however
* It is +constant+ - i.e., cannot grow/shrink dynamically.
* It is +global+ - has nothing to do with SFTP or SCP or any other sub-protocol
but rather with the SSH server as a whole.
Note that having a large thread pool does not necessarily improve throughput
since there is a context switch overhead.
> sshd setPermanentTransferThreads functionality in Apache SSHD ( Transfer
> thread pool size)
> ------------------------------------------------------------------------------------------
>
> Key: SSHD-1090
> URL: https://issues.apache.org/jira/browse/SSHD-1090
> Project: MINA SSHD
> Issue Type: New Feature
> Affects Versions: 2.5.0
> Reporter: Susmit Sarkar
> Priority: Blocker
> Labels: mina, sshd
>
> Hello MINA team,
> Maverick Legacy SFTP server has the below api:
> [http://maverick-legacy-server-javadocs.s3-website-eu-west-1.amazonaws.com/com/maverick/nio/DaemonContext.html#setPermanentTransferThreads(int])
> *public void setPermanentTransferThreads(int permanentTransferThreads)*
>
> Set the number of permanent transfer threads. Once a socket has either been
> accepted or connected, the socket is registered with a transfer thread. This
> thread asynchronously performs all the IO for the socket. If all the
> permanent threads become fully loaded then additional threads will be created
> to handle additional connections and shutdown once they have no sockets to
> service.
>
> Is there any API simliar to the same functionality in APACHE Mina sshd
> library? If not then how to achieve the same functionality in sshd
>
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
