Unable to pass all the tests with pnetcdf 1.6.1, Intel 15.0.3.048 and Mvapich2 2.1

[Wei-keng Liao]

In that case, it is likely mvapich does not perform correctly.

In PnetCDF, when NC_NOWRITE is used in a call to ncmpi_open,
PnetCDF calls a MPI_File_open with the open flag set to MPI_MODE_RDONLY. See
http://trac.mcs.anl.gov/projects/parallel-netcdf/browser/tags/v1-6-1/src/lib/mpincio.c#L322

Maybe test this with a simple MPI-IO program below.
It prints error messages like
    Error at line 15: File does not exist, error stack:
    ADIOI_UFS_OPEN(69): File tooth-fairy.nc does not exist

But, no file should be created.


#include <stdio.h>
#include <unistd.h> /* unlink() */
#include <mpi.h>

int main(int argc, char **argv) {
    int err;
    MPI_File fh;

    MPI_Init(&argc, &argv);

    /* delete "tooth-fairy.nc" and ignore the error */
    unlink("tooth-fairy.nc");

    err = MPI_File_open(MPI_COMM_WORLD, "tooth-fairy.nc", MPI_MODE_RDONLY, MPI_INFO_NULL, &fh);
    if (err != MPI_SUCCESS) {
        int errorStringLen;
        char errorString[MPI_MAX_ERROR_STRING];
        MPI_Error_string(err, errorString, &errorStringLen);
        printf("Error at line %d: %s\n",__LINE__, errorString);
    }
    else
        MPI_File_close(&fh);

    MPI_Finalize();
    return 0;
}


Wei-keng

On Sep 20, 2015, at 1:51 PM, Craig Tierney - NOAA Affiliate wrote:

> Wei-keng,
> 
> I always run distclean before I try to build the code.  The first test failing is nc_test.  The problem seems to be in this test:
> 
>    err = ncmpi_open(comm, "tooth-fairy.nc", NC_NOWRITE, info, &ncid);/* should fail */
>     IF (err == NC_NOERR)
>         error("ncmpi_open of nonexistent file should have failed");
>     IF (err != NC_ENOENT)
>         error("ncmpi_open of nonexistent file should have returned NC_ENOENT");
>     else {
>         /* printf("Expected error message complaining: \"File tooth-fairy.nc does not exist\"\n"); */
>         nok++;
>     }
> 
> A zero length tooth-fairy.nc file is being created, and I don't think that is supposed to happen.  That would mean that the mode NC_NOWRITE is not being honored by MPI_IO.  I will look at this more tomorrow and try to craft a short example.
> 
> Craig
> 
> On Sun, Sep 20, 2015 at 10:23 AM, Wei-keng Liao <wkliao at eecs.northwestern.edu> wrote:
> Hi, Craig
> 
> Your config.log looks fine to me.
> Some of your error messages are supposed to report errors of opening
> a non-existing file, but report a different error code, meaning the
> file does exist. I suspect it may be because of residue files.
> 
> Could you do a clean rebuild with the following commands?
>     % make -s distclean
>     % ./configure --prefix=/apps/pnetcdf/1.6.1-intel-mvapich2
>     % make -s -j8
>     % make -s check
> 
> If the problem persists, then it might be because mvapich.
> 
> Wei-keng
>