SolitaryThinker
145082cf74
Directory rename (git mv, history preserved) plus rewrite of all references: absolute imports in tests, the zero-dep runner, docstrings, comments, and the README. No behavior change. Run: python3 -m pytest v2/tests/ -q ; python3 v2/run_tests.py ; python3 -m v2.examples
82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
"""Tagged memory pools with reservation-before-admission (design_v3 §6.2, §7.3).
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> Reservation must be pre-flight. A scheduler that admits a diffusion step and then
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> discovers it cannot allocate the VAE tile is wrong.
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Sleep/wake is component-granular (tags are component names) for RL: drop DiT + caches,
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keep VAE/text-encoder resident (design_v3 §7.3; CuMem-style).
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"""
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from __future__ import annotations
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import itertools
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from dataclasses import dataclass, field
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class OutOfMemory(Exception):
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pass
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_res_ctr = itertools.count(1)
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@dataclass
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class Reservation:
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res_id: int
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tag: str
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nbytes: int
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active: bool = True
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class MemoryManager:
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def __init__(self, total_bytes: int = 1 << 40, per_tag_budget: dict[str, int] | None = None):
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self.total_bytes = total_bytes
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self.per_tag_budget = dict(per_tag_budget or {})
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self.reserved = 0
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self._by_tag: dict[str, int] = {}
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self._reservations: dict[int, Reservation] = {}
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self._asleep: set[str] = set()
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@property
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def available(self) -> int:
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return self.total_bytes - self.reserved
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def can_reserve(self, tag: str, nbytes: int) -> bool:
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if nbytes > self.available:
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return False
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budget = self.per_tag_budget.get(tag)
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if budget is not None and self._by_tag.get(tag, 0) + nbytes > budget:
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return False
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return True
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def reserve(self, tag: str, nbytes: int) -> Reservation:
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if not self.can_reserve(tag, nbytes):
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raise OutOfMemory(f"cannot reserve {nbytes} bytes for tag {tag!r} "
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f"(available={self.available}, used={self._by_tag.get(tag, 0)})")
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res = Reservation(next(_res_ctr), tag, nbytes)
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self._reservations[res.res_id] = res
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self.reserved += nbytes
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self._by_tag[tag] = self._by_tag.get(tag, 0) + nbytes
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return res
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def release(self, res: Reservation) -> None:
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if not res.active:
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return
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res.active = False
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self._reservations.pop(res.res_id, None)
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self.reserved -= res.nbytes
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self._by_tag[res.tag] = max(0, self._by_tag.get(res.tag, 0) - res.nbytes)
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# component-granular sleep/wake (tags = component names) ------------------- #
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def sleep(self, tags: list[str]) -> int:
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freed = 0
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for tag in tags:
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self._asleep.add(tag)
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for res in [r for r in self._reservations.values() if r.tag == tag]:
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freed += res.nbytes
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self.release(res)
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return freed
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def wake(self, tags: list[str]) -> None:
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for tag in tags:
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self._asleep.discard(tag)
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