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Subject: Re: [OMPI users] MPI_File_write hangs on NFS-mounted filesystem
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2013-11-11 14:17:21


FWIW, I tried this sample program on OMPI 1.6.x and 1.7.x, and it worked for me on NFS.

On Nov 7, 2013, at 12:45 PM, Jeff Hammond <jeff.science_at_[hidden]> wrote:

> That's a relatively old version of OMPI. Maybe try the latest
> release? That's always the safe bet since the issue might have been
> fixed already.
>
> I recall that OMPI uses ROMIO so you might try to reproduce with MPICH
> so you can report it to the people that wrote the MPI-IO code. Of
> course, this might not be an issue with ROMIO itself. Trying with
> MPICH is a good way to verify that.
>
> Best,
>
> Jeff
>
> Sent from my iPhone
>
> On Nov 7, 2013, at 10:55 AM, Steven G Johnson <stevenj_at_[hidden]> wrote:
>
>> The simple C program attached below hangs on MPI_File_write when I am using an NFS-mounted filesystem. Is MPI-IO supported in OpenMPI for NFS filesystems?
>>
>> I'm using OpenMPI 1.4.5 on Debian stable (wheezy), 64-bit Opteron CPU, Linux 3.2.51. I was surprised by this because the problems only started occurring recently when I upgraded my Debian system to wheezy; with OpenMPI in the previous Debian release, output to NFS-mounted filesystems worked fine.
>>
>> Is there any easy way to get this working? Any tips are appreciated.
>>
>> Regards,
>> Steven G. Johnson
>>
>> -----------------------------------------------------------------------------------
>> #include <stdio.h>
>> #include <string.h>
>> #include <mpi.h>
>>
>> void perr(const char *label, int err)
>> {
>> char s[MPI_MAX_ERROR_STRING];
>> int len;
>> MPI_Error_string(err, s, &len);
>> printf("%s: %d = %s\n", label, err, s);
>> }
>>
>> int main(int argc, char **argv)
>> {
>> MPI_Init(&argc, &argv);
>>
>> MPI_File fh;
>> int err;
>> err = MPI_File_open(MPI_COMM_WORLD, "tstmpiio.dat", MPI_MODE_CREATE | MPI_MODE_WRONLY, MPI_INFO_NULL, &fh);
>> perr("open", err);
>>
>> const char s[] = "Hello world!\n";
>> MPI_Status status;
>> err = MPI_File_write(fh, (void*) s, strlen(s), MPI_CHAR, &status);
>> perr("write", err);
>>
>> err = MPI_File_close(&fh);
>> perr("close", err);
>>
>> MPI_Finalize();
>> return 0;
>> }
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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