[MITgcm-support] optimization: lapack? flags?

[Andrea Cimatoribus]

Dear all,
I am starting to do some more ambitious simulations, in terms of 
computational effort, and it is thus time for me to optimize the 
compilation a bit. I know it is mostly a matter of trial and error with 
compiler options, but I would like to ask you if you have some 
suggestion on two specific points:

- Is it possible to compile using gfortran and use intel MKL? My 
genmake2 now reports that it is compiling without LAPACK. I tried to 
link to the Intel MKL I have on my machine (while still using gfortran, 
we don't have intel compilers for the moment), but without much success. 
Is anyone actually using LAPACK? Does it make a difference? I could find 
hardly anything in the archives.
- Apart from the "classical" useSingleCpuIO and globalFiles, is there 
any other runtime flag which has a significant impact on execution time 
(but does not affect the results)?

Thank you very much, Andrea

-- 
Andrea Cimatoribus
postdoctoral researcher
EPFL ENAC IIE ECOL
https://people.epfl.ch/andrea.cimatoribus