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I am currently using ifort (Intel Fortran compiler). However, in the AMD cluster (which has AMD processors), it seems that Intel parallel studio can not be installed. Therefore I decided to use gfortran (GNU Fortran compiler) instead of ifort. In ifort, my compiler flags were ftn -heap-arrays -mcmodel=large -g -c I want to know the similar optimization flags in the GNU compiler. My GCC version is 4.4.7 in centos 6.6 and the rocks cluster version is 6.2.

Debarshi Majumder
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  • See [here](https://stackoverflow.com/questions/22832496/gfortran-flag-for-intels-heap-arrays-size) for `-heap-arrays`. `-g -c` is the same for both compilers. `-mcmodel=large` also appears to be the same for both. I wouldn't have described any of those flags as "optimization flags" exactly. – veryreverie Dec 10 '21 at 18:50
  • You will want to add the `-O` or `-O2` options at minimum with gfortran. – steve Dec 11 '21 at 17:12

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