My applications save a good-sized hdf5 dataset.

It takes a fairly long time to read back in (around 4 minutes).

If I do a simple repack on the file (h5repack infile outfile) reading it back 
in only takes around 1 minute.

What's h5repack doing  that speeds up the reads so much, and how do I implement 
that in my application?

(I was using h5repack to test different chunking sizes, and everything I did in 
h5repack gave a similar time, including repacking to the same chunking scheme 
as the original dataset).

Thanks,
  Peter Steinberg
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