Re: SSH GUI slow

On Fri, 09 May 2008 15:31:22 GMT curt <97WideGlide@xxxxxxxxxxxxxxx> wrote:

| I initially thought Matlab was the problem but I was very surprised to
| think that inefficient code can cause a GUI to run 10-15 times more
| slowly simply because it is being piped through ssh. I mean, nothing
| really changes except that the ssh tunnel is inserted into the equation,
| right ? The XWindow system is exactly the same, the hardware/driver
| configuration is exactly the same and the application is exactly the
| same. The only difference is the way these (and other) subsystems are
| working together via ssh.

When it's not going through SSH, the difference between 1ms and 15ms to update
a window won't be noticed. This difference would be a function how much data
the application is sending through. In X, it can be a lot. If it refreshes
more window contents and not just the little bit that changes, that volume of
data can be a big load. SSH would have to encrypt all of that data. Have you
tried compression to see if it might help?


| I've got to think that there is something else going on here.

That's always possible. But I've used X over SSH before and found it slow
for some applications. It's not as bad as when I used X over a dialup.
In the case of dialup I could really see which apps were problematic.
For some, updates over dialup were in minutes, not seconds.

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