I recently upgraded my os to Ubunto 18.04 and I have problems since.
Right now I reformatted my desktop and installed a fresh version of Ubuntu 18.04 and Installed intel C++ compiler and MPI library 2019 version 2.
When I run my codes, after a couple of hours and thousands of time steps I get the following error message:
Abort(873060101) on node 15 (rank 15 in comm 0): Fatal error in PMPI_Recv: Invalid communicator, error stack:
PMPI_Recv(171): MPI_Recv(buf=0x4b46a00, count=36912, MPI_DOUBLE, src=14, tag=25, MPI_COMM_WORLD, status=0x1) failed
PMPI_Recv(103): Invalid communicator
[cli_15]: readline failed
My code used to run fine on Ubuntu 16.04 (with older version of Intel's compiler and MPI), and also runs well on various big clusters.
My code uses Isend for sending information and Recv for reciving. Throughout my code I only use MPI_COMM_WORLD communicator and I never create a new one.
Can you pls help me find out what's wrong?