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Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!decvax!decwrl!glacier!mips!mash
From: mash@mips.UUCP
Newsgroups: net.arch,net.micro.att
Subject: Re: AT&T MIPS claim [really task-switching]
Message-ID: <516@mips.UUCP>
Date: Tue, 17-Jun-86 05:03:12 EDT
Article-I.D.: mips.516
Posted: Tue Jun 17 05:03:12 1986
Date-Received: Thu, 19-Jun-86 07:57:35 EDT
References: <577@scirtp.UUCP> <124@bakerst.UUCP> <583@scirtp.UUCP> <506@mips.UUCP> <217@njitcccc.UUCP>
Reply-To: mash@mips.UUCP (John Mashey)
Distribution: net
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 32
Xref: watmath net.arch:3484 net.micro.att:1302

In article <217@njitcccc.UUCP> ken@njitcccc.UUCP (Kenneth Ng) writes:
>In article <506@mips.UUCP>, mash@mips.UUCP writes:
>> 	a) LDPCTX and SVPCTX aren't on the top 25 in usage of CPU time,
>> 	even in VMS Kernel mode. The top 25 instructions use 62% of the
>> 	total kernel time, and the smallest shown is REMQUE with 1.31%.
>> 	This was for multi-user workloads.
>Out of curiousity, what were the top 5 or so instructions and the
>percentage of cpu time used?

1) Instruction Distributions - Multi-user workload, VMS Kernel Mode
	Frequency Order		Time Order
		%			%
1	MOVL	10.21		MOVL	8.19
2	BEQL	5.59		MTPR	5.27
3	RSB	4.33		BBC	3.39
4	BNEQ	3.99		REI	3.29
5	MOVZWL	3.25		BSBW	3.08

2) Instruction Distributions - Multi-user workload, All Modes
	Frequency Order		Time Order
		%			%
1	MOVL	11.40		MOVC3	13.14
2	BEQL	5.85		CALLS	7.80
3	BNEQ	3.07		MOVL	6.60
4	MOVZBL	3.07		RET	4.07
5	BBS	2.77		MULF3	3.59

I won't attempt to summarize the paper; it's well worth reading.
-- 
-john mashey	DISCLAIMER: <generic disclaimer, I speak for me only, etc>
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