CODEWITHSUNDEEP
optimizationgccfortranicc
Yotam
Yotam

Reputation: 10675

Optimizing fortran program using gcc or icc

I find it terribly hard to find any "formal" documentation about fortran online. I want to know how to optimize the code (compilation wise) I tried the -O3 using f95 compiler but I want to know if there is anything else I can do. As for icc, this is a future issue and I only want to be "prepared".

Upvotes: 0

Views: 158

Answers (1)

High Performance Mark
High Performance Mark

Reputation: 78306

I can't understand why it is terribly hard for you to find 'formal' documentation about Fortran online. I just Googled the search term optimizing fortran programs and got about 4.5M hits. On the first page about 6 (out of 10) would be worth looking at at least briefly; some of the links pointed back here to SO questions and answers.

To help you prepare for using Intel compilers here's a link to their documentation . If you wander around the Intel site you'll find useful information on optimising your programs which is applicable to many compilers, not just the Intel products.

Your first resource for optimisation-by-compiler ought to be the documentation for your compiler, which will show you all the options available. It ought to tell you, for example, what options -O3 engages. On most compilers I've used the -O optimisation option is a short hand for a number of other flags, and it's interesting to see the effect of those flags individually or in combinations other than all-or-none.

The Fortran Company web-site is another useful jumping-off point for your searches. I could go on, but won't.

Upvotes: 2

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