Intel fortran to gfortran

[alozada]

Hi @RezaRezaei,
this link can be useful:

Equivalent gfort and ifort compilation

I am trying to compile a code using gfortran instead of ifortran. The gfortran code runs much much slower than the ifortran code. It does not even use all threads from my computer. I have 40 cores and 80 threads. ifort uses all of them.I think it has to do with the ifort flag /Qm64 but can’t be sure (using the /Qm32 flag on ifort is slower and does not use all the threads on openmp - not sure why). This is the way that visual studio seems to be compiling my code: Compiling with Intel® Fortran…

you could also try fpm to build your program
https://fpm.fortran-lang.org/en/index.html