[FLASH-USERS] performance of parallel hdf5 on Bigben at PSC

[Anshu Dubey]

People have used the parallel hdf5 module in Flash2.5 at the center
and still do, but on many platforms the restart is extremely slow.
We haven't been able to determine the cause. However, fortunately,
the problem didn't get carried over to Flash3, so we strongly
recommend switching over to Flash3 if it is possible for you.

Anshu

> Hi all,
>
>   I have a serious problem when using the parallel hdf5 module to
> restart from a checkpoint file. It takes about half an hour to read a
> single variable to each node for a 1GB file. The same problem was
> reported two year ago
> (http://flash.uchicago.edu/pipermail/flash-users/2005-April/001938.html)
> but I cannot find the follow-ups. Did anyone succeed in using the
> parallel hdf5 module so far? Will the Flash center continue support such
> issue on Flash2.5? Thanks!
>
> Bests,
> Shikui
>