[I] How can I set the SftpFileSystem POOL_SIZE for my SshServer? [mina-sshd]

[via GitHub]

reckenrod opened a new issue, #448:
URL: https://github.com/apache/mina-sshd/issues/448

   Hi. I am running a Mina-based Sftp server on v2.11.0. I am having 
performance issues compared to regular SSHD, so I want to try to tune the 
`POOL_SIZE` or other variables of the underlying `SftpFileSystem` to see if 
that helps as mentioned in the [2.11 release 
notes](https://github.com/apache/mina-sshd/releases/tag/sshd-2.11.0.) I am not 
finding the `SftpModuleProperties` based way to set this intuitive however.
   
   Here's some snippets of relevant code. I have a `MinaServerProvider` class 
creating an `SshServer`, and an `MinaSftpSubsystemFactory` where I create 
subsystems with SFTP hooks.
   
   I'm just kindof floundering, trying to set the `POOL_SIZE` on objects which 
will allow me to here:
   1. The `SshServer` I create and
   2. the `ChannelSession` passed in the `createSubsystem` method.
   
   Are either of these even the right objects to try to set this `POOL_SIZE` 
on? If not, what would be?
   
   #### MinaServerProvider
   ```
   class MinaServerProvider implements Provider<SshServer> {
   ....
   
       @Override
       public SshServer get() {
           log.info("Mina Log: Serving a Mina server");
           final SshServer server = SshServer.setUpDefaultServer();
           try {
               ....
               // set some server properties
               ....
               SftpModuleProperties.POOL_SIZE.set(server, 16);
               ....
               // start the server and return it
               ....
   ```
   
   #### MinaSftpSubsystemFactory
   ```
   class MinaSftpSubsystemFactory extends SftpSubsystemFactory {
   
       @Override
       public Command createSubsystem(ChannelSession channel) throws 
IOException {
           ....
           // set a hook
           ....
           SftpModuleProperties.POOL_SIZE.set(channel, 16);
           SftpSubsystem subsystem = new MinaSftpSubsystem(channel, this, 
minaSftpHook);
           return subsystem;
   ```
   
   Thanks in advance :)


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