Path: utzoo!attcan!uunet!steinmetz!vdsvax!barnett
From: barnett@vdsvax.steinmetz.ge.com (Bruce G. Barnett)
Newsgroups: comp.unix.wizards
Subject: Re: On Bringing a Sun to It Knees.
Message-ID: <4591@vdsvax.steinmetz.ge.com>
Date: 10 Jun 88 10:46:17 GMT
References: <493@jim.odr.oz>
Reply-To: barnett@vdsvax.steinmetz.ge.com (Bruce G. Barnett)
Organization: General Electric CRD, Schenectady, NY
Lines: 15

In article <493@jim.odr.oz> jon@jim.odr.oz (Jon Wells) writes:
|Does Sun use some `clever' algorithm for paging which gets confused by
|random accesses and starts paging out the things that it needs most????

I did some benchmarks on a SunOS 3.0 system and found the system
page thrashing when traversing a large matrix on the diagonal.
I then did a vadvise(VA_FLUSH) at the top and got a factor of 10 improvement.

Your supposition may be correct in some cases.

FYI: Sun 4's and Context switching. The Sun4/110 only has 8 contexts
in hardware. The Sun 4/280 has 16. See SunOS 4.0 Device Driver Manuals.
-- 
	Bruce G. Barnett 	<barnett@ge-crd.ARPA> <barnett@steinmetz.UUCP>
				uunet!steinmetz!barnett