[petsc-users] Unable to create >4GB sized HDF5 files on Cray XC30

[Jed Brown]

Juha Jäykkä <juhaj at iki.fi> writes:
> What happens when, say, one has three ranks and Vec lengths 120, 120, and 128 
> bytes (or 15, 15, and 16 doubles) on the three ranks: the average becomes 
> 122.667 which isn't even an integer. How should the chunk dimensions look like 
> here? Ceil(122.667), perhaps? But then the sum of chunk sizes > data size, so 
> there will be extra data in the file (which I presume HDF5 will take care of 
> when accessing the file), is that right?

Yes, there will be some extra space, but HDF5 will deal with it.

> I'll try to get something useful in. What's the timetable?

Thanks.  You're the one that asked to use chunking so it's on your time.
If other people ask before you put something together, we'll check in
with you and decide what to do.
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