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Message from discussion Global array operations: a performance hit?
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glen herrmannsfeldt  
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 More options Jun 17 2008, 8:36 pm
Newsgroups: comp.lang.fortran
From: glen herrmannsfeldt <g...@ugcs.caltech.edu>
Date: Tue, 17 Jun 2008 16:36:27 -0800
Local: Tues, Jun 17 2008 8:36 pm
Subject: Re: Global array operations: a performance hit?
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Dennis Wassel wrote:

(snip, and previously snipped DO vs. array expressions)

> I'm not a compiler specialist but AFAIK, array operations should not
> usually be slower than explicit loop constructs.

To make a fair comparison, it should be separate DO loops
vs. array operations, and separate DO loops vs.
a single DO loop.  Then you can separate the difference
due to memory access patterns and actual instructions.

My usual rule is that simple array operations are better than
(or at least as good as) DO loops, but more complicated ones
are slower.  (Especially if temporary arrays are used.)

-- glen


 
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