Globo-on-GPUs-(CINECA-GPU-hackathon-2024).md

@@ -10,6 +10,7 @@ The code has been compiled and run on Leonardo. The configurations for compiling
 ### Compiling with nvfortran
 nvfortran is a Fortran compiler released by Nvidia, and optimized to run Fortran code on GPUs through OpenACC. It is also possible to use OpenACC with GNU compilers, but performances are not optimal.
 ### nofma option
+There are differences between results obtained compiling the code with gfortran and nvfortran. During the hackathon, we checked that the differences were reasonably small to continue the GPU porting; however, these differences should be checked systematically and the effect of using different compiling options should be also checked. A useful option to reduce these differences is to use the `-nofma` option with the nvfortran compiler.
 
 ## Profiling 
 ### Nvidia Nsight Systems