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Message from discussion Global array operations: a performance hit?
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robert.corb...@sun.com  
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 More options Jun 17 2008, 10:04 pm
Newsgroups: comp.lang.fortran
From: robert.corb...@sun.com
Date: Tue, 17 Jun 2008 19:04:07 -0700 (PDT)
Local: Tues, Jun 17 2008 10:04 pm
Subject: Re: Global array operations: a performance hit?
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On Jun 17, 5:36 pm, glen herrmannsfeldt <g...@ugcs.caltech.edu> wrote:

> 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.)

An assignment of a scalar to an array should never use a
temporary array.  Even the simplest compiler should get that
right.

Bob Corbett


 
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