A Tuesday 09 November 2010 16:38:10 Francesc Alted escrigué:
> Hmm, this seems a problem with Blosc indeed.  Could you put the
> compressed datafile (for example, noaa18_2008_zlib3.h5) in a public
> place so that I can see what's going on?

Thanks Gerrit for your sample file.  I've looked at the issue, but it 
looks like a (complex) inefficiency in the Lempel-Ziv part of Blosc 
(BloscLZ).  I've no time now to look into this, so I created a ticket:

http://blosc.pytables.org/trac/ticket/7

Hope this can be addressed in the near future.

-- 
Francesc Alted

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