[CM] file ops

[Bill Schottstaedt]

Since several people seem to be worrying about disk accesses --
I think that modern OS's (linux in particular) 
automatically cache files in RAM -- what appear to be disk ops are
actually references to memory.  In the bad old days you had to use
mmap or something -- I forget how it used to work. 
This info itself may be out-of-date -- I am not an OS wizard!

My first thought when I hear about dropouts is not "disk ops", but
"garbage collection", and then "X server traffic", and then "some
background process".   I believe the latter is one thing that
Fernando's real-time kernel deals with.  And Motif generates
at least an order of magnitude less X traffic than Gtk. 
As I say, I don't actually know anything...