Hi,
A user here is trying to use an Alpha PersonalWorkStation 500/400 with
2mb cache, 256mb RAM, 3xlocal wide scsi 9gb disks to perform some image
enhancements on some rather large radarsat images (these are something
like 6000x7000 single band images, and the enhancement involves a 13x13
matrix of pixels around the central pixel, not sure what happens at the
edges).
I assume that the alpha chip is a super pipline type processor, and that
the cache is probably used for both instructions and data, basically the
only tuning that can be done, is to make sure that os tables are not
running out of space, this could possibly be achieved by increasing the
max users to something like 132 and rebuilding the kernel.
Does anyone have any clues on what might be done to speed up processing.
I know that there is the possibility of increasing cache to 8mb. Before
I did anything like that I'd like to know what the miss rate was on the
cache (are there tuning tools for that sort of thing). The process is
probably not that easy to time, to find out if it is io or cpu bound, by
just using "time" to run the command. Perhaps there is a system monitor
that can give a continual readout of the amount of cpu/io that is going
on on the system (like the performance monitor on suns).
Dennis Macdonell
email: mcdonell_at_auslig.gov.au
Received on Thu Mar 26 1998 - 00:55:18 NZST