def _set_cache_too_slow_without_c(self, attr):
# the direct algorithm is fastest and most direct if there is only one
# delta. Also, the extra overhead might not be worth it for items smaller
# than X - definitely the case in python, every function call costs
# huge amounts of time
# if len(self._dstreams) * self._bstream.size < self.k_max_memory_move:
if len(self._dstreams) == 1:
return self._set_cache_brute_(attr)
# Aggregate all deltas into one delta in reverse order. Hence we take
# the last delta, and reverse-merge its ancestor delta, until we receive
# the final delta data stream.
# print "Handling %i delta streams, sizes: %s" % (len(self._dstreams), [ds.size for ds in self._dstreams])
dcl = connect_deltas(self._dstreams)
# call len directly, as the (optional) c version doesn't implement the sequence
# protocol
if dcl.rbound() == 0:
self._size = 0
self._mm_target = allocate_memory(0)
return
# END handle empty list
self._size = dcl.rbound()
self._mm_target = allocate_memory(self._size)
bbuf = allocate_memory(self._bstream.size)
stream_copy(self._bstream.read, bbuf.write, self._bstream.size,
256 * mmap.PAGESIZE)
# APPLY CHUNKS
write = self._mm_target.write
dcl.apply(bbuf, write)
self._mm_target.seek(0)
def _set_cache_too_slow_without_c(self, attr):
# the direct algorithm is fastest and most direct if there is only one
# delta. Also, the extra overhead might not be worth it for items smaller
# than X - definitely the case in python, every function call costs
# huge amounts of time
# if len(self._dstreams) * self._bstream.size < self.k_max_memory_move:
if len(self._dstreams) == 1:
return self._set_cache_brute_(attr)
# Aggregate all deltas into one delta in reverse order. Hence we take
# the last delta, and reverse-merge its ancestor delta, until we receive
# the final delta data stream.
# print "Handling %i delta streams, sizes: %s" % (len(self._dstreams), [ds.size for ds in self._dstreams])
dcl = connect_deltas(self._dstreams)
# call len directly, as the (optional) c version doesn't implement the sequence
# protocol
if dcl.rbound() == 0:
self._size = 0
self._mm_target = allocate_memory(0)
return
# END handle empty list
self._size = dcl.rbound()
self._mm_target = allocate_memory(self._size)
bbuf = allocate_memory(self._bstream.size)
stream_copy(self._bstream.read, bbuf.write, self._bstream.size, 256 * mmap.PAGESIZE)
# APPLY CHUNKS
write = self._mm_target.write
dcl.apply(bbuf, write)
self._mm_target.seek(0)