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[BUG] all augmentation pipeline were on the same GPU #115

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merged 1 commit into from
Jan 29, 2022
Merged

[BUG] all augmentation pipeline were on the same GPU #115

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8 changes: 6 additions & 2 deletions ffcv/loader/epoch_iterator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,10 @@ def __init__(self, loader: 'Loader', order: Sequence[int]):
self.terminate_event = Event()
self.memory_context = self.loader.memory_manager.schedule_epoch(
batches)

if IS_CUDA:
self.current_stream = ch.cuda.current_stream()

try:
self.memory_context.__enter__()
except MemoryError as e:
Expand Down Expand Up @@ -96,7 +100,7 @@ def run(self):
# and make sure no one overwrite the data until they are done
just_finished_slot = (slot - self.loader.batches_ahead) % (self.loader.batches_ahead + 2)
event = ch.cuda.Event()
event.record(ch.cuda.default_stream())
event.record(self.current_stream)
events[just_finished_slot] = event
b_ix += 1

Expand Down Expand Up @@ -146,7 +150,7 @@ def __next__(self):
if IS_CUDA:
stream = self.cuda_streams[slot]
# We wait for the copy to be done
ch.cuda.current_stream().wait_stream(stream)
self.current_stream.wait_stream(stream)
return result

def __iter__(self):
Expand Down