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From: eo@ansa.co.uk (Ed Oskiewicz)
Newsgroups: comp.os.minix
Subject: Buffer cache thrashing: was (Re: p.c for Minix)
Message-ID: <25595@nigel.udel.EDU>
Date: 25 Jul 90 13:00:15 GMT
Sender: mmdf@ee.udel.EDU
Lines: 21

Hello all,

I have noticed something similar recently that might be cache
thrashing in ST/1.5.10. I converted mg1b, a public domain gnu-emacs
look-alike which is my minix editor quite some time ago and it runs
chmem'd to 100K it has given me no problems.

Recently when trying to write out a 43K file it took a very long
time as there was only disc activity about every 30 seconds (like
when update calls sync). Normally it would take a couple of seconds
- this problem does not occur if the emacs is compiled with the
recently posted c68 (using ack libc)! I haven't looked into this in
detail yet but will try chmem, my buffer cache is about 120 blocks.

I have had little feedback to my shutdown(1m) program so will repost
soon incorporating Earl Chew's improvements. If the referees exist
could one of you indicate what one has to do to get an
acknowledgement that you have received (and are looking at) a
submission.

Ed (eo@ansa.co.uk)