[mpich-discuss] ADIOI_Set_lock error

[Rob Latham]

On 10/31/2016 11:47 PM, Luke Van Roekel wrote:
> Hello,
>
> I've been trying to compile and run a very simple mpi test on our
> cluster with intel-mpi and openmpi.  The test program is below.  When I
> run with openmpi everything is fine.  When I run with intel-mpi, I
> receive the following error
>
> This requires fcntl(2) to be implemented. As of 8/25/2011 it is not.
> Generic MPICH Message: File locking failed in ADIOI_Set_lock(fd 6,cmd
> F_SETLKW/7,type F_WRLCK/1,whence 0) with return value FFFFFFFF and errno 26.

>
> - If the file system is NFS, you need to use NFS version 3, ensure that
> the lockd daemon is running on all the machines, and mount the directory
> with the 'noac' option (no attribute caching).
>
> - If the file system is LUSTRE, ensure that the directory is mounted
> with the 'flock' option.
>
> ADIOI_Set_lock:: Function not implemented
>
> ADIOI_Set_lock:offset 0, length 4


your site administrator needs to enable fcntl locking with the 'flock' 
mount option .

You can try disabling data sieving:  you would create an MPI_Info object 
and add the key "romio_ds_write" with the value "disable"

==rob

>
>
> Any thoughts on how to proceed?  The size/format of the file read in
> seems to make no difference.
>
> Regards,
> Luke
>
>
>  #include <stdio.h>
>
>  #include <stdlib.h>
>
>  #include <mpi.h>
>
>
>
>   int main(int argc, char **argv) {
>
>     int buf, err;
>
>     MPI_File fh;
>
>     MPI_Status status;
>
>
>     MPI_Init(&argc, &argv);
>
>     if (argc != 2) {
>
>         printf("Usage: %s filename\n", argv[0]);
>
>         MPI_Finalize();
>
>         return 1;
>
>     }
>
>     err = MPI_File_open(MPI_COMM_WORLD, argv[1], MPI_MODE_CREATE |
>
>                         MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
>
>     if (err != MPI_SUCCESS) printf("Error: MPI_File_open()\n");
>
>
>     err = MPI_File_write_all(fh, &buf, 1, MPI_INT, &status);
>
>     if (err != MPI_SUCCESS) printf("Error: MPI_File_write_all()\n");
>
>
>     MPI_File_close(&fh);
>
>     MPI_Finalize();
>
>     return 0;
>
> }
>
>
>
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