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Internal #1356

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6 changes: 5 additions & 1 deletion grain/_src/python/dataset/transformations/prefetch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,8 @@ def __init__(
self._buffer = collections.deque()
self._lock = threading.Lock()
self._executor_wrapper = None
self._next_depth_measure_step = 0
self._depth_measure_freq = 100

assert isinstance(read_options.num_threads, int)
assert isinstance(read_options.prefetch_buffer_size, int)
Expand Down Expand Up @@ -257,7 +259,9 @@ def __next__(self) -> T:
if not self._buffer:
# Fill the buffer on the first iteration.
self._fill_buffer()
self._measure_prefetch_depth()
if self._next_returned_index >= self._next_depth_measure_step:
self._measure_prefetch_depth()
self._next_depth_measure_step += self._depth_measure_freq
element = self._buffer.popleft()
# Prefetch elements until the buffer is full again.
self._fill_buffer()
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