Ed:
On Wed, 29 Jun 2005, Ed Hartnett wrote:
> Howdy all!
>
> I have a question about parallel programming with HDF5. Do parallel
> programmers just not use unlimited dimensions?
>
You can use unlimited dimensions for parallel programming.
> I noticed that H5Dextend is a collective operation. This would make it
> difficult for programs to add a record at a time.
>
I don't think it is difficult as long as all processors participate.
I may miss something. Parallel NetCDF tests I wrote include unlimited
dimension dataset tests for both collective and independent modes. Tests
passed.
Although H5Dextend is collective, I remember that I noticed that doesn't
matter for netCDF4 users. I may be wrong. Maybe other people can give
some insights.
Kent
> Alternatively I could imagine a scheme where extending the
dataset > would be buffered - some large number of records could be added
> whenever the current batch is used up.
>
> Any thoughts or comments about the use or misuse of unlimited
> dimensions with HDF5 parallel would be most welcome.
>
> Thanks!
>
> Ed
>
>
