[OMPI users] mmap and MPI_File_Read

[Andreas Bok Andersen]

I am using Open-MPI in a parallelization of matrix multiplication for large
matrices.
My question is:
-  Is MPI_File_read using mmapping under the hood when reading a binary
file.
- Or is the better/most efficient solution to read the input files using
the native mmap in C++

Best Andreas