| 1 | # SPDX-License-Identifier: Apache-2.0 |
| 2 | # SPDX-FileCopyrightText: Copyright contributors to the vLLM project |
| 3 | """Supporting utilities for the ECCPUConnector scheduler.""" |
| 4 | |
| 5 | import msgspec |
| 6 | |
| 7 | from vllm.logger import init_logger |
| 8 | |
| 9 | # (host, port) pair identifying a remote peer's ZMQ side-channel endpoint. |
| 10 | PeerAddr = tuple[str, int] |
| 11 | |
| 12 | logger = init_logger(__name__) |
| 13 | |
| 14 | |
| 15 | # Msgpack (de)serialization for the list-of-(addr, size, device_id) |
| 16 | # descriptor form that NIXL's `get_xfer_descs` expects. |
| 17 | _MemDescList = list[tuple[int, int, int]] |
| 18 | |
| 19 | _mem_desc_encoder = msgspec.msgpack.Encoder() |
| 20 | _mem_desc_decoder = msgspec.msgpack.Decoder(_MemDescList) |
| 21 | |
| 22 | |
| 23 | def serialize_mem_descriptor(descs: _MemDescList) -> bytes: |
| 24 | return _mem_desc_encoder.encode(descs) |
| 25 | |
| 26 | |
| 27 | def deserialize_mem_descriptor(payload: bytes) -> _MemDescList: |
| 28 | return _mem_desc_decoder.decode(payload) |
| 29 | |
| 30 | |
| 31 | def build_block_descs( |
| 32 | base_ptr: int, |
| 33 | num_blocks: int, |
| 34 | block_size_bytes: int, |
| 35 | device_id: int = 0, |
| 36 | ) -> _MemDescList: |
| 37 | """Per-block `(addr, size, device_id)` tuples for an `ECSharedRegion`. |
| 38 | |
| 39 | Handed to `nixl.get_xfer_descs` to build a dlist where descriptor `i` |
| 40 | addresses block `i` in the mmap. This makes a WRITE to block indices |
| 41 | `[i1, i2, ...]` a simple `make_prepped_xfer(..., [i1, i2])` on both |
| 42 | ends — no per-request address math. |
| 43 | """ |
| 44 | return [ |
| 45 | (base_ptr + i * block_size_bytes, block_size_bytes, device_id) |
| 46 | for i in range(num_blocks) |
| 47 | ] |