[GRASS5] network traffic

[Chris Marshall]

 I dont' know what is going on but a really nice way of running chatty X
programs remotely over thin, high latency network pipes is with VNC.


-----Original Message-----
From: Roger Miller
To: grass5 at grass.itc.it
Sent: 1/26/02 12:08 PM
Subject: [GRASS5] network traffic


Folks,

I run GRASS (5.0.0pre2) through ssh on a ppp connection to my
installation at 
the office.  I used the command line interface.  When I start a monitor
the 
lag between keystrokes and displayed results often increases.  Starting
a 
second monitor virtually stops everything.  The lag between the time a
key is 
pressed and the time it appears on the screen sometimes exceeds 30
seconds.

I started pppstat on my local machine to see what was going on, and
found 
that the first monitor generated a continuous stream of network traffic
at 
about 8kb/second incoming and 4-5 kb/s outgoing.  Somewhat bizzarly,
starting 
a second monitor dropped that stream to about 5 kb/second incoming and
about 
200 bytes/s outgoing.  The command shell slowed to a near halt.

After I stopped the second monitor the network traffic initially stayed
at 
about 4 kb/s incoming and 200 bytes/s outgoing, but the traffic later
rose 
fairly gradually back to about 8 kb/s incoming and 4-5 kb/s outgoing.

All of this behavior is with a blank monitor--nothing at all in the
display.  
The behavior is the same regardless of whether the monitor is raised or
not.

For comparison, "xeyes" running over the same link and taking a
continuous 
stream of mouse events generated about 1/10 that much traffic.  "xcalc" 
running over the same link generated no traffic at all when it wasn't
being 
used. 

I tried with a second installation at my office that was based on a CVS 
download from last August.  That appeared to have the same problem.  I
have 
until recently been using a beta11 installation and never noticed the
problem.

What's going on here?  Is this problem unique to my installations or is
this 
a consistent behavior?


Roger Miller

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