[Numpy-discussion] fast numpy i/o

Christopher Barker Chris.Barker@noaa....
Tue Jun 21 13:01:25 CDT 2011

Neal Becker wrote:
> I'm wondering what are good choices for fast numpy array serialization?
> mmap: fast, but I guess not self-describing?
> hdf5: ?

Should be pretty fast, and self describing -- advantage of being a 
standard. Disadvantage is that it requires an hdf5 library, which can b 
a pain to install on some systems.

> pickle: self-describing, but maybe not fast?
> others?

there is .tofile() and .fromfile() -- should be about as fast as you can 
get, not self-describing.

Then there is .save(), savez() and .load() (.npz format)? It should be 
pretty fast, and self-describing (but not a standard outside of numpy).

I doubt pickle will ever be your best bet.


Christopher Barker, Ph.D.

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