root@ubuntu:/home# mpiexec -f hosts.cfg -n 500 ./hello

=====================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES

=   EXIT CODE: 139
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
=====================================================================================
[proxy:0:0@hesh] HYD_pmcd_pmip_control_cmd_cb (./pm/pmiserv/pmip_cb.c:928): assert (!closed) failed

[proxy:0:0@hesh] HYDT_dmxu_poll_wait_for_event (./tools/demux/demux_poll.c:77): callback returned error status
[proxy:0:0@hesh] main (./pm/pmiserv/pmip.c:226): demux engine error waiting for event
[mpiexec@ubuntu] HYDT_bscu_wait_for_completion (./tools/bootstrap/utils/bscu_wait.c:70): one of the processes terminated badly; aborting

[mpiexec@ubuntu] HYDT_bsci_wait_for_completion (./tools/bootstrap/src/bsci_wait.c:23): launcher returned error waiting for completion
[mpiexec@ubuntu] HYD_pmci_wait_for_completion (./pm/pmiserv/pmiserv_pmci.c:191): launcher returned error waiting for completion

[mpiexec@ubuntu] main (./ui/mpich/mpiexec.c:405): process manager error waiting for completion

Also some I time I got the following error:

root@ubuntu:/home# mpiexec -f hosts.cfg -n 400 ./hello

[proxy:0:1@ubuntu] send_cmd_downstream (./pm/pmiserv/pmip_pmi_v1.c:80): assert (!closed) failed
[proxy:0:1@ubuntu] fn_get (./pm/pmiserv/pmip_pmi_v1.c:349): error sending PMI response
[proxy:0:1@ubuntu] pmi_cb (./pm/pmiserv/pmip_cb.c:327): PMI handler returned error

[proxy:0:1@ubuntu] HYDT_dmxu_poll_wait_for_event (./tools/demux/demux_poll.c:77): callback returned error status
[proxy:0:1@ubuntu] main (./pm/pmiserv/pmip.c:226): demux engine error waiting for event
[mpiexec@ubuntu] control_cb (./pm/pmiserv/pmiserv_cb.c:215): assert (!closed) failed

[mpiexec@ubuntu] HYDT_dmxu_poll_wait_for_event (./tools/demux/demux_poll.c:77): callback returned error status
[mpiexec@ubuntu] HYD_pmci_wait_for_completion (./pm/pmiserv/pmiserv_pmci.c:181): error waiting for event

[mpiexec@ubuntu] main (./ui/mpich/mpiexec.c:405): process manager error waiting for completion

 

Also I raised the open file limit on both the PCs by using ulimit -n 2048. But still the same result. 

/* C Example */
#include <mpi.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>

int main (int argc, char* argv[])
{
  int rank, size;
  int buffer_length = MPI_MAX_PROCESSOR_NAME;
  char hostname[buffer_length];

  MPI_Init (&argc, &argv);      /* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);        /* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);        /* get number of processes */

  MPI_Get_processor_name(hostname, &buffer_length); /* get hostname */

  printf( "Hello world from process %d running on %s of %d\n", rank, hostname, size );
  MPI_Finalize();
  return 0;
}

For 10000 process the program is unresponsive and I have to close the terminal to exit.t