H5Part development and discussion

[Achim Gsell <achim AT cybercity.ch>]

On Thursday 19 April 2007 17:53, John Biddiscombe wrote:

> 2) Added option to use INDEPENDENT_IO instead of
> COLLECTIVE_IO, I need this when using it on a system with a
> non-parallel file-system, using collective IO causes too large
> performance drop on our cluster.

INDEPENDENT_IO vs COLLECTIVE_IO in H5Part, good point. A couple 
of weeks ago a college found a bug in H5Part concerning 
COLLECTIVE_IO (or we understand something completely wrong): The 
H5FD_MPIO_COLLECTIVE property is added to the property list 
f->xfer_prop, but this property list is not used in I/O calls. 
Thus we are using independent I/O. It's the same in version 1.0!  
John (Shalf), any idea/comments about this?

> 6) Added a function to query IsTimeStep Present, so 
> that I don't overwrite an existing one if redoing the same
> time

For me it is OK to add such a function, but SetStep already 
returns an error, if the step exists. 

> If I update my copy to work with your 1.3.2 (svn head), can I
> send you a large patch with all of it in, or would you prefer
> smaller patches which address individual issues (much more
> work)

Since I want to review the patches, I prefer a set of smaller 
patches.

Achim