sun4/280 memory control

[Jeff Butterworth]

I'm helping with a project that uses a sun4 280 to communicate with some
external devices, one of which is a video digitizer.

An upcoming use of this system will require grabbing video images in real
time.  Unfortunately, the amount of data per image is about 100Kb.  This
means that after a little while, huge pieces of memory will begin to be
swapped to disk, thus slowing down the machine.  This slowdown will ruin
our real time goal.  So far, I have two ideas about how to keep the video
frame grabbing going as fast as possible.

(1) Keep all other users off of the machine during the experiment.  I know
that this seems a little rude, but the machine is primarily used just for
this experiment.  I've talked to the local system administrator and he
assured me that this is easy to do.

(2) Somehow tell the operating system not to swap certain blocks of memory
out to disk.  My problem is that I don't know how to do this but have
heard rumors that it is possible.  Does anyone out there know how to do
this?