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fix: move posix_fadvise(DONTNEED) after read loop so it actually evicts pages (#985)

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Will Miao
2026-06-16 23:12:02 +08:00
parent 58c266ad07
commit 6263e6848c
1 changed files with 3 additions and 1 deletions
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4
py/utils/file_utils.py
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@@ -44,9 +44,11 @@ async def calculate_sha256(file_path: str) -> str:
chunk_size = _get_hash_chunk_size_bytes() chunk_size = _get_hash_chunk_size_bytes()
with open(file_path, "rb") as f: with open(file_path, "rb") as f:
fd = f.fileno() fd = f.fileno()
os.posix_fadvise(fd, 0, 0, os.POSIX_FADV_DONTNEED)
for byte_block in iter(lambda: f.read(chunk_size), b""): for byte_block in iter(lambda: f.read(chunk_size), b""):
sha256_hash.update(byte_block) sha256_hash.update(byte_block)
# Evict pages after reading so the data doesn't linger in the kernel page
# cache — on WSL this otherwise appears as unreclaimable VmmemWSL growth.
os.posix_fadvise(fd, 0, 0, os.POSIX_FADV_DONTNEED)
return sha256_hash.hexdigest() return sha256_hash.hexdigest()