Hello Wei-kang,
Thank you for your response. I suppose we could suggest something similar
functionality in future releases of netcdf4.
I looked at nc_put_varm familty. But it does not suit my purpose here.
Regards,
Ketan
On Tue, Mar 21, 2017 at 6:17 AM, Wei-keng Liao <wkliao@xxxxxxxxxxxxxxxxxxxxx
> wrote:
>
> As far as I know there is no such API available in NetCDF yet.
>
> There is one in PnetCDF called varn APIs that might do what you are asking.
> See the API description and examples in the URL below.
> http://cucis.ece.northwestern.edu/projects/PnetCDF/doc/
> pnetcdf-c/ncmpi_005fput_005fvarn_005f_003ctype_003e.html
>
> Please note the APIs are different between PnetCDF and NetCDF.
>
> Wei-keng
>
> On Mar 16, 2017, at 4:44 PM, Ketan Kulkarni wrote:
>
> > Hello!
> > I have implemented netcdf4 parllel writing of 4 dimensional(time, z, y,
> x) variable in our application which replaces posix based shared I/O into a
> binary file.
> > The data is correctly written into the file.
> > As a next step to take the application towards petaflop scale, I am
> planning to implement compute-node level I/O where only one core on each
> compute node will take part in writing the output. I know the start indices
> and counts from each core from the application.
> > I have gathered this information on one core of each compute node and I
> can write the gathered data one after the other in a for loop.
> > My question is, it possible to write this whole gathered array from the
> I/O core in one single call?
> > So far from the documentation I can understand that for nc_put_vara_type
> functions
> > the length of start and length of count has to match the dimensions of
> the variable.
> > Is it possible to replace this with a start vector and count vector
> which has multiple values corresponding to each block and supply the
> complete gathered array to one single nc_put_vara_type call.
> >
> > As a side note MPI standard guarantees that the MPI_gather will order
> the data according to ranks. So If I gather the start and count from each
> core in a single vector, they will correspond to each other.
> > Thank you and regards,
> > Ketan Kulkarni
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