Re: The program that stumbled

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#601

From: k... Ken Yap
Date: Sun, 31 Dec 1989 19:44

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|>I too, had a program that seemed 'stuck' on one address.

Speaking of being stuck on one address, my professor once told this
tale of misoptimization, quite possibly apocryphal. It seems these
computer architects were looking to speed up their machine. They looked
at their dynamic instruction counts and picked a branch instruction
that was heavily used. After fixing the microcode they started up the
system again and noticed NO improvement in speed. Turns out the branch
was used by the idle loop in the scheduler. All they did was make the
CPU spin its wheels faster.

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Message-ID: <1989Dec31.194422.3483@cs.rochester.edu>

Path: mbox-mo1.pugleaf.net!gmdzi!unido!mcsun!uunet!cs.utexas.edu!uwm.edu!rutgers!rochester!ken

References: <129578@sun.Eng.Sun.COM> <129587@sun.Eng.Sun.COM> <5979@yunexus.UUCP>

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Path: mbox-mo1.pugleaf.net!gmdzi!unido!mcsun!uunet!cs.utexas.edu!uwm.edu!rutgers!rochester!ken
From: k...@cs.rochester.edu (Ken Yap)
Newsgroups: alt.folklore.computers
Subject: Re: The program that stumbled
Message-ID: <1989Dec31.194422.3483@cs.rochester.edu>
Date: 31 Dec 89 19:44:22 GMT
References: <129578@sun.Eng.Sun.COM> <129587@sun.Eng.Sun.COM> <5979@yunexus.UUCP>
Reply-To: k...@cs.rochester.edu
Organization: University of Rochester Computer Science Department
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Posted: Sun Dec 31 20:44:22 1989
Address: Rochester, NY 14627, (716) 275-1448
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