[hdf-forum] HDF5 chunking mechanism

[Francesc Alted]

A Thursday 11 June 2009 17:34:46 Mark Howison escrigué:
> Hi all,
>
> I'm trying to write out a 512^3 float32 dataset using 64^3 chunk
> dimensions. I'm seeing the H5write call break into many 256 byte write
> calls (64 floats) instead of what I expected: fewer 1048576 byte write
> calls (64^3 floats). Before I delved into this further, I just wanted
> to verify that HDF5 should be using the 1048576 byte writes in this
> particular chunking case. This is a new case for me, because in the
> past I've almost always had the x-dimension for the chunks equal to
> the x-dimension of the hyperslab.

Mmm, that should not happen.  How are you guessing that H5write calls break 
into many 256 byte writes?  If you can provide an example of your code perhaps 
we would be able to help you more.

Cheers,

-- 
Francesc Alted

----------------------------------------------------------------------
This mailing list is for HDF software users discussion.
To subscribe to this list, send a message to hdf-forum-subscribe at hdfgroup.org.
To unsubscribe, send a message to hdf-forum-unsubscribe at hdfgroup.org.