Re: Converting from Turbo to Modula.

Article View: comp.lang.modula2

Article #3924

#3924

From: Dick Karpinski
Date: Wed, 04 Nov 1987 20:34

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In article <8711031748.AA10838@gpu.utcs.toronto.edu> Info-Modula2 Distribution List <INFO-M2%UCF1VM.bitnet@jade.berkeley.edu> writes:
>
>I don't think the
>slowness of the program has anything to do with the use of the
>automatic conversion ....

I have always found at least 20%, usually a factor of 2, and often
a factor of 10 available in the speed of execution while working
at the source level.  The approach I use is to profile the working
program (about 1 day, usually) and analyze the results carefully.
These first results can be astonishing or mundane.  Then I look 
for the parts that have high cost and find ways to avoid them or 
to greatly reduce the cost.  Usually a single day of recoding can
accomplish most of the readily available speedup.  The key thing
is to SEE where the time goes.  But most folks really don't care
to find out since they secretly believe that they will look silly
when their program runs faster with so little work.

Dick

Dick Karpinski  Manager of Minicomputer Services, UCSF Computer Center
UUCP:  ...!ucbvax!ucsfcgl!cca.ucsf!dick        (415) 476-4529 (11-7)
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From: dick@ccb.ucsf.edu (Dick Karpinski)
Newsgroups: comp.lang.modula2
Subject: Re: Converting from Turbo to Modula.
Message-ID: <1066@ucsfcca.ucsf.edu>
Date: Wed, 4-Nov-87 15:34:30 EST
Article-I.D.: ucsfcca.1066
Posted: Wed Nov  4 15:34:30 1987
Date-Received: Sat, 7-Nov-87 16:28:35 EST
References: <MSRS002@ECNCDC> <8711031748.AA10838@gpu.utcs.toronto.edu>
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Reply-To: dick@ucsfccb.UUCP (Dick Karpinski)
Organization: UCSF Computer Center
Lines: 25
Summary: To speed up: measure, think, alter, loop.

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