Bug#1066735: mpich: fails to connect processes and report ranks with trivial mpi test

[Samuel Thibault]

Control: reassign -1 mpich
Control: retitle -1 mpich: fails to connect processes and report ranks
Control: affects -1 + eztrace

Hello,

Lucas Nussbaum, le mer. 13 mars 2024 15:56:40 +0100, a ecrit:
> > [P0T0] Starting EZTrace (pid: 878489)...
> > [P0T0] MPI mode selected
> > This program requires 2 MPI processes, aborting...
> > dir: mpi_ping_trace
> > /bin/rm: cannot remove 'mpi_ping_trace': Directory not empty
> > [P0T0] Stopping EZTrace (pid:878489)...
> > [P0T0] Starting EZTrace (pid: 878488)...
> > [P0T0] MPI mode selected
> > This program requires 2 MPI processes, aborting...
> > [P0T0] Stopping EZTrace (pid:878488)...
> >      [OK] 

The test does run 2 processes. I tried this:

$ cat test.c
#include <mpi.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
	int rank, size;
	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	MPI_Comm_size(MPI_COMM_WORLD, &size);
	printf("I'm %d/%d\n", rank, size);
	return 0;
}

And it reports:

$ mpirun -np 2 ./test
Authorization required, but no authorization protocol specified

Authorization required, but no authorization protocol specified

Authorization required, but no authorization protocol specified

Authorization required, but no authorization protocol specified

I'm 0/1
I'm 0/1

and the same with a hosts file containing localhost twice.

Samuel