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random.getrandbits() is much faster than random.randint()

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This commit is contained in:
kris 2019-06-15 21:23:36 +01:00
parent ca817999f6
commit bf2057cbb9
1 changed files with 3 additions and 3 deletions
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6
transcoder/video.py
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@ -173,7 +173,7 @@ class Video:
# heap in case we can get back to fixing it exactly # heap in case we can get back to fixing it exactly
# during this frame. Otherwise we'll get to it later. # during this frame. Otherwise we'll get to it later.
heapq.heappush( heapq.heappush(
priorities, (-p, random.randint(0, 10000), page, o)) priorities, (-p, random.getrandbits(16), page, o))
offsets.append(o) offsets.append(o)
if len(offsets) == 3: if len(offsets) == 3:
@ -209,7 +209,7 @@ class Video:
priorities = [tuple(data) for data in np.stack(( priorities = [tuple(data) for data in np.stack((
-update_priority[pages, offsets], -update_priority[pages, offsets],
# Don't use deterministic order for page, offset # Don't use deterministic order for page, offset
np.random.randint(0, 10000, size=pages.shape[0]), np.random.randint(0, 2**8, size=pages.shape[0]),
pages, pages,
offsets) offsets)
).T.tolist()] ).T.tolist()]
@ -365,7 +365,7 @@ class Video:
# TODO: vectorize this with numpy # TODO: vectorize this with numpy
deltas = [ deltas = [
(priorities[i], random.randint(0, 10000), candidate_offsets[i]) (priorities[i], random.getrandbits(16), candidate_offsets[i])
for i in range(len(candidate_offsets)) for i in range(len(candidate_offsets))
] ]
heapq.heapify(deltas) heapq.heapify(deltas)