[mvapich-discuss] open non-existing files on Lustre expecting MPI_ERR_NO_SUCH_FILE but got MPI_SUCCESS

[Hari Subramoni]

Hello Wei-keng,

Many thanks for the report. We will take a look at it and get back to you
soon.

Best Regards,
Hari.

On Feb 7, 2017 1:12 AM, "Wei-keng Liao" <wkliao at eecs.northwestern.edu>
wrote:

> Hi,
>
> I am a developer of PnetCDF library and would like to file a bug report.
> Mark Dixon, a PnetCDF user cc-ed in this email, reported an error when
> building PnetCDF with mvapich2-2.2. The root cause of the error is due to
> mvapich2-2.2 fails to return the expected MPI error class
> MPI_ERR_NO_SUCH_FILE
> when a test program tries to open a non-existing file on Lustre.
>
> After some diggings, I found out that the Lustre driver in mvapich2 appends
> O_CREAT flag to the mode argument of the open call, (line 50, in file
> src/mpi/romio/adio/ad_lustre/ad_lustre_open.c). Because of that, the file
> is
> mistakenly created and MPI_SUCCESS is returned, which is an unexpected
> outcome
> by MPI standard.
>
> Attached is a small MPI program to reproduce such error. Mark has used it
> to
> verify the issue described above. He also ran it against an ext4 (UFS) and
> the
> correct error class was returned. So the problem is specific for Lustre
> driver.
> Please see the discussion email threads:
> http://lists.mcs.anl.gov/pipermail/parallel-netcdf/
> 2017-February/001897.html
>
>
> Wei-keng
>
>
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>
>
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