[MPICH2-dev] running out of fd's?

[Rob Ross]

default socket max is i think 1024? -- rob

On Jan 30, 2008, at 1:26 PM, Darius Buntinas wrote:

> I bet it's gforker.  It creates O(N) sockets for stdio, etc.  Try  
> mpd and see if that helps.
>
> -d
>
> On 01/30/2008 01:06 PM, Nicholas Karonis wrote:
>> Hi,
>> I just installed MPICH2-1.0.6 on Mac OS X 10.5.1 (i.e., Leopard).
>> I configured it with the gforker and it was all compiled using
>> Gnu's C and C++ compilers that came with the developer tools
>> on the Mac OS X disk.
>> The build seem to go OK and so I tried testing it with a small
>> ring program (source at bottom).  When I run the ring with -np 75
>> all is OK but when I increase it to 100 I get an error message:
>> /* running with 75, all OK */
>> mpro% mpiexec -np 75 ring
>> nprocs 75 received 75
>> /* attempting to run with 100, problem :-( */
>> mpro% mpiexec -np 100 ring
>> Error in system call select: Bad file descriptor
>> mpro%
>> Any suggestions?
>> Thanks in advance,
>> Nick
>> --- app source
>> mpro% cat ring.c
>> #include "mpi.h"
>> #include <stdio.h>
>> #include <stdlib.h>
>> int main(int argc, char *argv[])
>> {
>>    int nprocs, myid;
>>    int val;
>>    MPI_Status st;
>>    MPI_Init(&argc, &argv);
>>    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
>>    if (nprocs > 1)
>>    {
>>    MPI_Comm_rank(MPI_COMM_WORLD, &myid);
>>    if (myid == 0)
>>    {
>>        val = 1;
>>        MPI_Send(&val, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
>>        MPI_Recv(&val, 1, MPI_INT, nprocs-1, 0, MPI_COMM_WORLD, &st);
>>        printf("nprocs %d received %d\n", nprocs, val);
>>    }
>>    else
>>    {
>>        MPI_Recv(&val, 1, MPI_INT, myid-1, 0, MPI_COMM_WORLD, &st);
>>        val ++;
>>        MPI_Send(&val, 1, MPI_INT, (myid+1)%nprocs, 0,  
>> MPI_COMM_WORLD);
>>    } /* endif */
>>    } /* endif */
>>    MPI_Finalize();
>>    exit(0);
>> } /* end main() */
>> mpro%
>