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| import torch |
| from .base_io_buffer import Base_IO_Buffer |
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| NUM_BUFFERS = 2 |
| INVALID_BUFFER_INDEX = -1 |
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|
| class Double_IO_Buffer(Base_IO_Buffer): |
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| def __init__(self, pinned_tensor, dnvme_handle): |
| super(Double_IO_Buffer, self).__init__(pinned_tensor, dnvme_handle) |
| assert self._pinned_tensor.numel() % (NUM_BUFFERS * self._dnvme_handle.get_alignment()) == 0 |
| self._buffers = self._split_buffer() |
| self._fill_index = 0 |
| self._drain_index = INVALID_BUFFER_INDEX |
| self._buffer_offset = 0 |
|
|
| def fill(self, src_tensor, src_offset): |
| self._validate_buffer_index(self._fill_index) |
| copy_bytes = Base_IO_Buffer.fill_buffer(src_tensor, src_offset, self._buffers[self._fill_index], |
| self._buffer_offset) |
| self._buffer_offset += copy_bytes |
| return copy_bytes |
|
|
| def drain(self, num_bytes, fd, file_offset): |
| self._validate_buffer_index(self._fill_index) |
| self.complete_ongoing_drain() |
| assert self._drain_index == INVALID_BUFFER_INDEX |
| self._drain(num_bytes, fd, file_offset, blocking=False) |
| self._drain_index = self._fill_index |
| self._fill_index = (self._fill_index + 1) % NUM_BUFFERS |
| self._buffer_offset = 0 |
|
|
| def get_buffer(self): |
| self._validate_buffer_index(self._fill_index) |
| return self._buffers[self._fill_index] |
|
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| def get_offset(self): |
| self._validate_buffer_index(self._fill_index) |
| return self._buffer_offset |
|
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| def get_aligned_num_bytes(self): |
| self._validate_buffer_index(self._fill_index) |
| aligned_size = self._dnvme_handle.get_alignment() |
| return (self._buffer_offset // aligned_size) * aligned_size |
|
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| def get_unaligned_num_bytes(self): |
| self._validate_buffer_index(self._fill_index) |
| return self._buffer_offset % self._dnvme_handle.get_alignment() |
|
|
| def is_full(self): |
| self._validate_buffer_index(self._fill_index) |
| return self._buffer_offset == self._buffers[self._fill_index].numel() |
|
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| def is_empty(self): |
| self._validate_buffer_index(self._fill_index) |
| return self._buffer_offset == 0 and not self._is_ongoing_drain() |
|
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| def reset(self): |
| self._buffer_offset = 0 |
|
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| def complete_ongoing_drain(self): |
| if self._is_ongoing_drain(): |
| self._wait_for_drain() |
|
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| def _split_buffer(self): |
| buffer_size = self._pinned_tensor.numel() // NUM_BUFFERS |
| return [torch.narrow(self._pinned_tensor, 0, (i * buffer_size), buffer_size) for i in range(NUM_BUFFERS)] |
|
|
| def _validate_buffer_index(self, index): |
| assert index in [0, 1] |
|
|
| def _wait_for_drain(self): |
| self._validate_buffer_index(self._drain_index) |
| assert 1 == self._dnvme_handle.wait() |
| self._drain_index = INVALID_BUFFER_INDEX |
|
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| def _is_ongoing_drain(self): |
| return self._drain_index != INVALID_BUFFER_INDEX |
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