Re: ssh / DISPLAY / VNC alternative?
Re: ssh / DISPLAY / VNC alternative?
- Subject: Re: ssh / DISPLAY / VNC alternative?
- From: Chris Jones <email@hidden>
- Date: Wed, 04 Jun 2008 18:28:53 +0100
- Organization: University of Cambridge
Hi,
I doubt that the reason working remotely whilst travelling is slow
compared to at your work place has anything to do with ssh. In both
cases X windows are being sent of the net and X is a relatively heavy
protocol.
I suspect the reason it is fast at work is simply because you are on a
private network with much high bandwidth to that you get out in the
wild. If you whree to try using ssh at work, my guess is you would find
it as fast as 'xhost + set DISPLAY'. I use ssh to access machcines at
work, but at work and from outside, and I see the same effect. Fast
locally, slow over the general internet.
The bottom line is sending X windows is a heavy business. This is why NX
came into being and it does a great job (If you start looking into how
NX does this you will see it is a complicated issue). However it is true
installing this is non-trivial.
Beyond trying the -C option to compress your ssh traffic, I doubt there
is much you can do that will better the performance you currently get
from vnc (which is also designed to solve the speed thing, but not as
nicely as NX does).
Chris
email@hidden wrote:
Hi,
At work I use my Mac to access my Linux box's CAD tools - I use xhost and set DISPLAY etc. and it all works great. It's very responsive and life is good :-). I use this method instead of joining a VNC session on the Linux box because when using VNC I see the yucky Linux desktop and it's windowing system, whereas when using xhost/DISPLAY all the individual windows just appear on my Mac and I can find them using Expose etc.
When traveling, I can use ssh to display all my Linux windows back onto my Mac, but it's intolerably slow. I am then forced to use VNC. The VNC session actually has MORE graphics to deal with than the ssh session because it also has to update the Linux desktop etc.
I understand VNC is built for speed - graphics are compressed prior to transmission and caching occurs at both ends. Is there some other solution similar to ssh that will allow me to display the individual Linux windows on my Mac but also has the speedy functionality of VNC?
Thanks,
Mick
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