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From: mouse@mcgill-vision.UUCP
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Help on deciphering crash
Message-ID: <596@mcgill-vision.UUCP>
Date: Sun, 11-Jan-87 06:57:47 EST
Article-I.D.: mcgill-v.596
Posted: Sun Jan 11 06:57:47 1987
Date-Received: Sat, 17-Jan-87 16:39:18 EST
References: <3645@sdcrdcf.UUCP> <4891@mimsy.UUCP> <1419@cit-vax.Caltech.Edu> <4914@mimsy.UUCP>
Organization: McGill University, Montreal
Lines: 24
Xref: watmath comp.unix.questions:671 comp.unix.wizards:608

In article <4914@mimsy.UUCP>, chris@mimsy.UUCP (Chris Torek) writes:
> Anyway, you could try disabling the cache:
> 	mtpr(CADR, 1);	/* CADR is register 0x25 */
> but that will probably slow the machine to a crawl.

In case anyone is curious....I just tried this.  My check of how slow
the machine was was a user level program that did

	while (! signaled)
	 { count ++;
	 }

and asked for a SIGALRM in ten seconds.  Then the speed measure is how
far count gets.  With the cache turned off it counted only half as far
(plus or minus maybe 10%) as with the cache on.

This was a 750 running MtXinu 4.3+NFS.

					der Mouse

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