Help getting started with Pnetcdf

[Nikhil Laghave]

Hi,
This is certainly a good idea. I can offer my examples too as and when I
complete this small program.

Thank you very much for your help.

Regards,
Nikhil

On Mon, Oct 13, 2008 at 5:02 PM, michael <michael.bane at manchester.ac.uk>wrote:

> On Mon, 2008-10-13 at 16:48 -0500, Robert Latham wrote:
> > On Mon, Oct 13, 2008 at 04:07:52PM -0500, Nikhil Laghave wrote:
> > > Hello All,
> > >
> > > I have been using Parallel HDF5 for our code to do parallel IO of huge
> files
> > > but the performance we're getting is not very encouraging. So I wanted
> to do
> > > the same with Pnetcdf, but I am not able find much tutorials on the web
> with
> > > simple examples to write out files in parallel. The ones that are there
> are
> > > the serial ones.
> > >
> > > So I was wondering if someone on this mailing list has a simple Pnetcdf
> > > example, that will help me in understanding how to use pnetcdf.
> >
> > Hi
> >
> > We really could use some more in-depth tutorials.  Perhaps the best
> > examples right now are those in the 'test' directory.   You can also
> > use the serial netcdf as a starting point:  nfmpi_def_dim behaves just
> > like nf_def_dim, for example, though you might have to adjust the size
> > and types of some of your variables.
> >
> > > Also, I am trying to create a simple file using pnetcdf and am getting
> this
> > > error. There seems to be some problem with the include file and I don't
> > > understand how to get rid of this error. My code is as follows:
> >
> > I think I see what's wrong here.  Two things, one small and one
> > larger.
> >
> > >       nfmpi_create(MPI_COMM_WORLD,FILE_NAME,
> > >      &     NF_NETCDF4,MPI_INFO_NULL,ncid)
> >
> > The NF_NETCDF4 flag doesn't have any meaning in pnetcdf land, but I
> > don't think this why you are having problems.
> >
> > > When i compile this using : ftn simple.f $PNETCDF, i get this error.
> > >
> > > PGF90-S-0021-Label field of continuation line is not blank
> > > (/usr/common/usg/pnetcdf/1.0.2/include/pnetcdf.inc: 1816)
> >
> > line 1816 is:
> > #define NF_INT1_IS_C_SIGNED_CHAR 1
> >
> > We require our fortran codes to use the C preprocessor.  For many
> > compilers, this means using the '.F' suffix, or take Jim Edward's
> > advice.
> >
> > People have used the portland group compilers with parallel-netcdf, so
> > I bet we can get you back on track in short order.
> >
> > ==rob
>
>
> I can dig out my examples and offer up, perhaps we could create a Wiki
> for people to upload (and improve!) examples?
>
> I don't know if there's {m}any UK {academic-related} people on the list
> but here's an event you may be interested in on 4 Dec 2008 in NW
> England: http://www.hpcx.ac.uk/about/events/parallel_io.html (albeit
> apparently more application than lower level focussed). Feel free, when
> booking/enquiring, to said I advertised this to you.
>
> M
>
>


-- 
Regards,
Nikhil
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/parallel-netcdf/attachments/20081013/4d698c1e/attachment.htm>