[X2Go-Dev] Issue with 100% cpu usage in x2goclient + libssh 0.6.0

[Mike Gabriel]

Hi Alex,

On  Do 23 Jan 2014 00:36:37 CET, Oleksandr Shneyder wrote:

> Am 22.01.2014 22:36, schrieb Orion Poplawski:
>> With libssh 0.6.0, x2goclient consumes 100% cpu on connection.  The trigger
>> for this is that ssh_select() was rewritten to use poll() instead  
>> of select().
>>  poll() has a timeout in milliseconds, select() in microseconds.  x2goclient
>> requests a timeout of 500 microseconds which is getting rounded down to a
>> timeout of 0 milliseconds for poll().
>>
>> However, this still seems to point to some poor coding on the part of
>> x2goclient that we're using such short timeouts.  Why can't we just wait
>> forever in ssh_select() in SshMasterConnection::channelLoop() ?
>>

> Hello Orion,
>
> We can't wait forever in ssh_select, we must perform other tasks in
> loop, for example accepting forwarded connections. However, I have
> already increased a select timeout and made a lot of other changes in
> ssh code of X2Go Client. The changes are not yet in master GIT because
> they depend on reverse forwarding fixes, that I made to libssh. As soon
> as we have libssh packages ready, I'll push my local commits to GIT.

I have merged the revtunnel branch of x2goclient.git now into the  
repo's master branch.

For Debian, I already have provided the libssh fixes  
(0.5.4-2~debX+x2go1 where X in {6, 7, 8}.

For Ubuntu and our Fedora/EPEL builds this is still pending and on my  
todo list.

Please commit your recent (local) changes on top of the current master HEAD.

Thanks,
Mike



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