Path: utzoo!mnetor!uunet!lll-winken!ubvax!weitek!rober
From: rober@weitek.UUCP (Don Rober)
Newsgroups: comp.arch
Subject: Re: Curb feelers (was: Cray architecture)
Message-ID: <9357@weitek.UUCP>
Date: 26 Apr 88 16:45:04 GMT
References: <7762@alice.UUCP> <418@ole.UUCP> <3216@phri.UUCP> <1574@osiris.UUCP> <505@xios.XIOS.UUCP> <4777@cup.portal.com>
Reply-To: rober@weitek.UUCP (Don Rober)
Distribution: na
Organization: WEITEK Corp. Sunnyvale Ca.
Lines: 10

The Burroughs A9 and A10 had busy meters on the console. A bar graph on the
25th line conatined up to 20 'R's (meaning 'running', 5%/R).

It was done by using the idle instruction to send a message to the maintenance
processor at a fixed rate. The maintenance processor integrated the messages
over time, and subtracted from 1 to get the busy rate.

A crude measure, but no cost and it was sometimes useful.
-- 
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Don Rober				UUCP: {pyramid, cae780}!weitek!rober
Weitek Corporation	1060 East Arques		Sunnyvale, CA 94086