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import unittest, netCDF4, tempfile, os
file_name = tempfile.NamedTemporaryFile(suffix='.nc', delete=False).name
cache_size = 10000
cache_nelems = 100
cache_preempt = 0.5
cache_size2 = 20000
cache_nelems2 = 200
cache_preempt2 = 1.0
class RefCountTestCase(unittest.TestCase):
def setUp(self):
nc = netCDF4.Dataset(file_name, mode='w', format='NETCDF4')
d = nc.createDimension('fred', 2000)
# can only change cache size in createVariable (not nelems or preemption)
# this change lasts only as long as file is open.
v = nc.createVariable('frank','f',('fred',),chunk_cache=15000)
size, nelems, preempt = v.get_var_chunk_cache()
assert size==15000
self.file=file_name
nc.close()
def tearDown(self):
# Remove the temporary files
os.remove(self.file)
def runTest(self):
"""testing methods for accessing and changing chunk cache"""
# change cache parameters before opening fil.
netCDF4.set_chunk_cache(cache_size, cache_nelems, cache_preempt)
nc = netCDF4.Dataset(self.file, mode='r')
# check to see that chunk cache parameters were changed.
assert netCDF4.get_chunk_cache() == (cache_size, cache_nelems, cache_preempt)
# change cache parameters for variable, check
nc['frank'].set_var_chunk_cache(cache_size2, cache_nelems2, cache_preempt2)
assert nc['frank'].get_var_chunk_cache() == (cache_size2, cache_nelems2, cache_preempt2)
nc.close()
if __name__ == '__main__':
unittest.main()
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