H5Part development and discussion

[Achim Gsell <achim.gsell AT psi.ch>]

On Oct 31, 2012, at 7:28 PM, Matthew Bettencourt wrote:

> In the doc you say both start and end need to be -1,
> 
> "unset" by calling \c H5PartSetView(file,-1,-1);

Yes, there are more ways to reset the view:

H5PartSetView (file, -1, -1);
H5PartSetView (file, 0, -1);
H5PartResetView (file);


> What I want is to be able to have one set of code which works in parallel 
> for both if we have more particles than processors and if we have less 
> particles than processor.  Right now I tried both the 
> H5PartSetCanonicalView and setting by hand, it is impractical to set all 
> the indices that I want to read and read them in for a very large run.

My suggestion is to use 

H5PartSetViewIndices (file, NULL, 0); 

only in the special case where you want to select zero particles:

if (start <= end) 
   H5PartSetView (file, start, end);
else
   H5PartSetViewIndices (file, NULL, 0);

> Ideally one should have to have both start and end to -1, (which would most 
> likely fix the other bug)

Yes, but it may break some existing codes. So we shouldn't change this in 
Version 1.

Achim