pnetcdf-write-nb.c non-blocking

[Wei-keng Liao]

Hi,

The example program is buggy.
The write buffers for the two iput calls should be different.
FYI. Once a nonblocking iput/iget API is posted, the contents
of the buffers should not be touched before the call to
ncmpi_wait_all/ncmpi_wait. Otherwise, the results can be incorrect.

Please see the bug fix in http://trac.mcs.anl.gov/projects/parallel-netcdf/changeset/2095
Thanks for reporting this problem.

Wei-keng

On Sep 7, 2015, at 1:52 PM, W. Miah wrote:

> Hello,
> 
> I have downloaded pNetCDF and am browsing through the example code
> parallel-netcdf-1.6.0/examples/tutorial/pnetcdf-write-nb.c (attached
> with this email) which should write the MPI ranks into two arrays, but
> instead seems to be writing random values:
> 
> [miahw at bengal tutorial]$ ncdump output.nc
> netcdf output {
> dimensions:
>    d1 = 4 ;
> variables:
>    int v1(d1) ;
>    int v2(d1) ;
> 
> // global attributes:
>        :string = "Hello World\n",
>            "" ;
> data:
> 
> v1 = 0, 16777216, 33554432, 50331648 ;
> 
> v2 = 0, 16777216, 33554432, 50331648 ;
> }
> 
> I have looked at the code but can't see anything wrong with it. Could
> it be that the library has a bug?
> 
> Regards,
> 
> -- 
> web: http://miahw.wordpress.com
> gnupg: 2E29 B22F
> <pnetcdf-write-nb.c>