Re: [netcdfgroup] nf90_var_par_access - independent or collective

• Subject: Re: [netcdfgroup] nf90_var_par_access - independent or collective
• From: Karsten Bolding <karsten@xxxxxxxxxxxxxxxxxxxx>
• Date: Wed, 10 Sep 2014 13:54:06 +0200

Hi John

The program I'm testing is 'simple_xy_par_wr2.f90' from the NetCDF Fortran
distribution. And none of the dimensions are unlimited.

But nice to know for a real application.

Karsten

On Wed, Sep 10, 2014 at 1:50 PM, Holt, John R. <johhol@xxxxxxxxx> wrote:

>  Hi Karsten,
>
>
>
> I also bumped into this problem (although I didn’t get any error message).
> If one of your dimension is unlimited then all parallel IO must be
> collective.
>
>
>
> Cheers,
>
>
>
> John
>
>
>
> *From:* Karsten Bolding [mailto:karsten@xxxxxxxxxxxxxxxxxxxx]
> *Sent:* 10 September 2014 11:26
> *To:* netcdfgroup@xxxxxxxxxxxxxxxx
> *Subject:* [netcdfgroup] nf90_var_par_access - independent or collective
>
>
>
> Hello
>
>
>
> Compiling like:
>
> mpif90 simple_xy_par_wr2.f90
> -I/opt/netcdff-4.4.1-gfortran-4.8-par/include/
> /opt/netcdff-4.4.1-gfortran-4.8-par/lib/libnetcdff.a
>  /opt/netcdf-4.3.3-rc1-gcc-4.8-par/lib/libnetcdf.a
>  /opt/hdf5-1.8.13-gcc-4.8-par/lib/libhdf5_hl.a
> /opt/hdf5-1.8.13-gcc-4.8-par/lib/libhdf5.a -ldl -lm -lz -lcurl
>
>
>
> I can run:
>
>
>
> mpiexec -n 10 ./a.out
>
>
>
> with collective it works but with independent I get:
>
>
>
>  NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation.
> Use nc_va
>
>  NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation.
> Use nc_va
>
>  NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation.
> Use nc_va
>
> STOP 2
>
>  NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation.
> Use nc_va
>
>
>
> any ideas?
>
>
>
> Karsten
>
>
>
>
>
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• References:
  • [netcdfgroup] nf90_var_par_access - independent or collective
    • From: Karsten Bolding
  • Re: [netcdfgroup] nf90_var_par_access - independent or collective
    • From: Holt, John R.