Hi Francesc,

> I'm reluctant to zero the memory of the data container before data is read
> from HDF5 because of performance reasons.  I'm wondering whether this issue
> can be solved on the HDF5 part (i.e. zero memory before to write), or the user
> has to be forced to zero the memory of its data containers prior to read data
> (which would be bad news for performance).

Can this be addressed with the function H5Tset_pad?  The H5T
documentation suggests that if you set the padding of the destination
type to H5T_PAD_ZERO, the parts of the type not occupied by
"meaningful" data should be set to zero.  However, I've never tried
this...

Andrew

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