Path: utzoo!mnetor!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!lll-tis!mordor!sri-spam!sri-unix!garth!walter
From: walter@garth.UUCP (Walter Bays)
Newsgroups: comp.arch
Subject: Re: Curb feelers (was: Cray architecture)
Message-ID: <621@garth.UUCP>
Date: 29 Apr 88 00:11:30 GMT
References: <7762@alice.UUCP> <418@ole.UUCP> <3216@phri.UUCP> <1574@osiris.UUCP> <505@xios.XIOS.UUCP> <4777@cup.portal.com> <9357@weitek.UUCP> <2087@gumby.mips.COM>
Reply-To: walter@garth.UUCP (Walter Bays)
Distribution: na
Organization: INTERGRAPH (APD) -- Palo Alto, CA
Lines: 15

I liked the UNIVAC 1108.  Its console had a light that indicated CPU busy.
Normally, the light would flicker.  If the machine was idle the light was
off.  If it was very busy the light was on continuously.  I thought of,
but never tried, using a photo light meter to read percent busy.
You could estimate I/O busy by laying your hands on the disk drives.
(Even back then, UNIVAC had a good software performance monitor, but
that's no fun :-)
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