Benchmarking two techniques for compressing numpy arrays with python-blosc.

bench.py

""" Benchmarking two techniques for compressing numpy arrays with python-blosc.
"""

import numpy
import numpy.random
import time
import blosc
import blosc.blosc_extension as ext


in_ = numpy.arange(3e7)
print in_

tic = (time.time())

c = blosc.pack_array(in_)
out = blosc.unpack_array(c)
assert((in_ == out).all())


toc = (time.time())
print toc-tic

tic = (time.time())

c = ext.compress_ptr(in_.__array_interface__['data'][0],
        in_.size*in_.dtype.itemsize,
        in_.dtype.itemsize, 9, True)
out = numpy.empty(in_.size, dtype=in_.dtype)
d = ext.decompress_ptr(c, out.__array_interface__['data'][0])
assert((in_ == out).all())
assert(d == in_.size*in_.dtype.itemsize)

toc = (time.time())
print toc-tic