issues with MPI

compilation-installation
1

Hello,

My parallel simulation with MPI often stops prematurely because of a mystic segmentation fault that seemed to occur at different time steps each time I tried running the same simulation. On the other hand, the serial version has no such problem. I was using OpenMPI/intel/3.0.1 when the problem occurred. I then tried a newer version, OpenMPI/intel/4.0.1, and the problem seemed to go away. I am thus curious to know if there is a particular version of MPI that works the best for CROCO. Also, the cluster computer I am using has the PGI compiler in addition to the intel one I am using now. I am wondering if there is any preference between those two compilers for CROCO.

Thanks!
Guangyu

2

Hi Guangyu

There shouldn’t be any dependency to the version of the MPI version, the way it is implemented is pretty standard. About PGI, there is no preference a priori, I think it could worth trying to check which one is faster in your case.
Rachid

3

Thanks for your answer, Rachid. I think the difference I saw between the two versions (3.0.1 vs 3.1.3) of MPI was likely caused by some issue with their installations on the cluster I am using rather a general problem with the CROCO source code