MPI-IO File transfer between compute nodes

Question

How to transfer files from localscrach of one compute to localscratch of another compute node in a cluster using MPI-IO?

Answer 1

That isn't really how MPI-IO works. It's designed for reading and writing files, not necessarily transferring them from one process to another. There are plenty of other tools that will do that for you (scp, sftp, etc.)

If you really wanted to use MPI, you could read the file on one process, send the byte string to another process with normal MPI_SEND and MPI_RECV, and write that file back out on another process.