d.rast VERRRRY SLOWWWW ????

[Steven Rose]

Hi!  I'm running grass4.1 on DecStation 5000, Ultrix 4.3 with 24 meg 
RAM.  I have three maps, each covering a 110km x 140km area, with a 
cell resolution of 10m.  Each map only has one strip of 10km n/s by 
the width of the map.  Each strip is geographically seperate.  The 
three cell/ files are 1, 1.4 and 1.8 megs.  When I use d.rast to 
display these maps seperately, or overtop of each other (the -o 
option) everything displays fine in a few seconds; HOWEVER, after 
running r.patch to stick the three maps together, the resulting map 
(about 4.2 megs) takes about 45 MINUTES to d.rast!!! 

Anybody have any idea what's up?  Did I just overshoot memory 
requirements or something?  The disk drive does not seem to pounding 
away like it's swapping like crazy.  I've even shutdown the system 
and powered back up, but same results.  
Professor Steven Rose, R.P.F.       Phone: (705) 324-9144
Sir Sandford Fleming College        FAX:   (705) 878-9312
PO Box 8000, Lindsay,               Internet: srose at flemingc.on.ca
Ontario, CANADA K9V 5E6