allbery@ncoast.UUCP (02/20/87)
Well, it seems I forgot some information:
(1) We've already fiddled with buffers extensively, to no avail.
(2) With 5MB we don't swap. With 8MB we don't swap. And we're still slow.
(3) I've done more testing; the only correlation between system activity and
slowness is on number of processes.
We usually run 1 user in an Informix-SQL application, 7 in an RM/COBOL
application, and 5 in a UNIFY application; the others do various random
stuff (1 spreadsheet, 2 vi, ...)
ho95e!wcs (Bill Stewart) suggests we upgrade to a paging system. By (2)
above I suspect it wouldn't help, but paging OSes don't seem to be available
for the Plexus. (I even asked mtXinu if they knew of a BSD4.2 for it...)
BTW, the IMSP disk controller is too dumb for two disks to reduce disk-bound
processing time; it treats the two disks as one large disk. However, lots
of disk-bound stuff takes place at night, and runs blindingly fast. Once a
week the nightly processing overlaps for many software systems, but it still
runs quickly. It's just daytime stuff that drags.
--
++Brandon (Resident Elf @ ncoast.UUCP)
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