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751ad26 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | from __future__ import annotations
from dataclasses import dataclass, field
from collections import OrderedDict
from typing import Literal
from .backends import (
PreparedPageTorch,
cuda_available,
mps_available,
prepare_page_cuda,
prepare_page_mps,
prepare_pages_cuda,
prepare_pages_mps,
)
from .tracing import ExecutionTrace
from .types import EncodedPage
CachePolicy = Literal["fifo", "lru", "pinned_recent_fifo"]
CacheBackend = Literal["auto", "torch_mps", "torch_cuda", "cpu_ref"]
@dataclass(slots=True)
class PreparedPageCache:
max_resident_bytes: int | None = None
policy: CachePolicy = "fifo"
pinned_recent_pages: int = 0
_prepared_pages: dict[tuple[str, int], PreparedPageTorch] = field(default_factory=dict)
_prepared_page_ids: set[int] = field(default_factory=set)
_resident_bytes: int = 0
_order: OrderedDict[tuple[str, int], None] = field(default_factory=OrderedDict)
@property
def resident_bytes(self) -> int:
return self._resident_bytes
@property
def size(self) -> int:
return len(self._prepared_pages)
def clear(self) -> None:
self._prepared_pages.clear()
self._prepared_page_ids.clear()
self._resident_bytes = 0
self._order.clear()
def owns_prepared_page(self, page: PreparedPageTorch) -> bool:
return id(page) in self._prepared_page_ids
def _page_nbytes(self, page: PreparedPageTorch) -> int:
resident_nbytes = int(page.resident_nbytes)
if resident_nbytes > 0:
return resident_nbytes
return int(page.host_to_device_nbytes)
def _pinned_keys(self) -> set[int]:
if self.policy != "pinned_recent_fifo" or self.pinned_recent_pages <= 0:
return set()
keys = list(self._order.keys())
if not keys:
return set()
return set(keys[-self.pinned_recent_pages :])
def _touch_cached_page(self, cache_key: tuple[str, int]) -> None:
if self.policy == "lru":
self._order.move_to_end(cache_key)
def _evict_one(self, *, trace: ExecutionTrace | None = None) -> bool:
pinned_keys = self._pinned_keys()
fallback_key: tuple[str, int] | None = None
while self._order:
cache_key = next(iter(self._order))
self._order.pop(cache_key, None)
if cache_key in pinned_keys:
if fallback_key is None:
fallback_key = cache_key
self._order[cache_key] = None
if len(pinned_keys) >= len(self._order):
break
continue
cached_page = self._prepared_pages.pop(cache_key, None)
if cached_page is None:
continue
self._prepared_page_ids.discard(id(cached_page))
evicted_bytes = self._page_nbytes(cached_page)
self._resident_bytes = max(0, self._resident_bytes - evicted_bytes)
if trace is not None:
trace.record_cache_eviction(evicted_bytes)
trace.observe_cache_resident_bytes(self._resident_bytes)
return True
if fallback_key is not None:
self._order.pop(fallback_key, None)
cached_page = self._prepared_pages.pop(fallback_key, None)
if cached_page is None:
return False
self._prepared_page_ids.discard(id(cached_page))
evicted_bytes = self._page_nbytes(cached_page)
self._resident_bytes = max(0, self._resident_bytes - evicted_bytes)
if trace is not None:
trace.record_cache_eviction(evicted_bytes)
trace.observe_cache_resident_bytes(self._resident_bytes)
return True
return False
def _ensure_capacity(self, incoming_nbytes: int, *, trace: ExecutionTrace | None = None) -> None:
if self.max_resident_bytes is None:
return
while self._resident_bytes + incoming_nbytes > self.max_resident_bytes and self._prepared_pages:
if not self._evict_one(trace=trace):
break
def _resolve_backend(self, backend: CacheBackend) -> CacheBackend:
if backend != "auto":
return backend
if cuda_available():
return "torch_cuda"
if mps_available():
return "torch_mps"
return "cpu_ref"
def append_page(
self,
page: EncodedPage | PreparedPageTorch,
*,
backend: CacheBackend = "auto",
trace: ExecutionTrace | None = None,
) -> EncodedPage | PreparedPageTorch:
return self.prepare_page(page, backend=backend, trace=trace)
def append_pages(
self,
pages: list[EncodedPage | PreparedPageTorch],
*,
backend: CacheBackend = "auto",
trace: ExecutionTrace | None = None,
) -> list[EncodedPage | PreparedPageTorch]:
return self.prepare_pages(pages, backend=backend, trace=trace)
def prepare_page(
self,
page: EncodedPage | PreparedPageTorch,
*,
backend: CacheBackend = "auto",
trace: ExecutionTrace | None = None,
) -> EncodedPage | PreparedPageTorch:
resolved_backend = self._resolve_backend(backend)
if resolved_backend == "cpu_ref":
return page.source_page if isinstance(page, PreparedPageTorch) else page
if isinstance(page, PreparedPageTorch):
if trace is not None:
trace.record_cache_hit()
trace.observe_cache_resident_bytes(self._resident_bytes)
return page
cache_key = ("cuda" if resolved_backend == "torch_cuda" else "mps", id(page))
cached_page = self._prepared_pages.get(cache_key)
if cached_page is not None:
self._touch_cached_page(cache_key)
if trace is not None:
trace.record_cache_hit()
trace.observe_cache_resident_bytes(self._resident_bytes)
return cached_page
prepared_page = prepare_page_cuda(page, trace=trace) if resolved_backend == "torch_cuda" else prepare_page_mps(page, trace=trace)
self._ensure_capacity(self._page_nbytes(prepared_page), trace=trace)
self._prepared_pages[cache_key] = prepared_page
self._prepared_page_ids.add(id(prepared_page))
self._order[cache_key] = None
self._resident_bytes += self._page_nbytes(prepared_page)
if trace is not None:
trace.record_cache_miss()
trace.observe_cache_resident_bytes(self._resident_bytes)
return prepared_page
def prepare_pages(
self,
pages: list[EncodedPage | PreparedPageTorch],
*,
backend: CacheBackend = "auto",
trace: ExecutionTrace | None = None,
) -> list[EncodedPage | PreparedPageTorch]:
resolved_backend = self._resolve_backend(backend)
if resolved_backend == "cpu_ref":
return [page.source_page if isinstance(page, PreparedPageTorch) else page for page in pages]
prepared_pages: list[EncodedPage | PreparedPageTorch | None] = [None] * len(pages)
miss_indices: list[int] = []
miss_pages: list[EncodedPage] = []
for index, page in enumerate(pages):
if isinstance(page, PreparedPageTorch):
prepared_pages[index] = page
if trace is not None:
trace.record_cache_hit()
trace.observe_cache_resident_bytes(self._resident_bytes)
continue
cache_key = ("cuda" if resolved_backend == "torch_cuda" else "mps", id(page))
cached_page = self._prepared_pages.get(cache_key)
if cached_page is not None:
self._touch_cached_page(cache_key)
prepared_pages[index] = cached_page
if trace is not None:
trace.record_cache_hit()
trace.observe_cache_resident_bytes(self._resident_bytes)
continue
miss_indices.append(index)
miss_pages.append(page)
if miss_pages:
new_prepared_pages = prepare_pages_cuda(miss_pages, trace=trace) if resolved_backend == "torch_cuda" else prepare_pages_mps(miss_pages, trace=trace)
for index, source_page, prepared_page in zip(miss_indices, miss_pages, new_prepared_pages, strict=True):
self._ensure_capacity(self._page_nbytes(prepared_page), trace=trace)
cache_key = (prepared_page.device_type, id(source_page))
self._prepared_pages[cache_key] = prepared_page
self._prepared_page_ids.add(id(prepared_page))
self._order[cache_key] = None
self._resident_bytes += self._page_nbytes(prepared_page)
prepared_pages[index] = prepared_page
if trace is not None:
trace.record_cache_miss()
trace.observe_cache_resident_bytes(self._resident_bytes)
if any(page is None for page in prepared_pages):
raise RuntimeError("prepared page cache failed to populate all requested pages")
return [page for page in prepared_pages if page is not None]
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