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fix: guard posix_fadvise on non-Linux platforms to prevent AttributeError on Windows (#988)

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Will Miao
2026-06-17 17:22:10 +08:00
parent 33ee392b7b
commit 92b5efd414
1 changed files with 6 additions and 1 deletions
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7
py/utils/file_utils.py
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@@ -39,6 +39,9 @@ async def calculate_sha256(file_path: str) -> str:
Uses ``posix_fadvise`` with ``POSIX_FADV_DONTNEED`` to avoid polluting the OS page
cache — critical on WSL where cached file pages live inside the VM and are not
accounted for in guest ``used`` memory, causing VmmemWSL to balloon.
On Windows/macOS where ``posix_fadvise`` is not available the hint is silently
skipped.
"""
sha256_hash = hashlib.sha256()
chunk_size = _get_hash_chunk_size_bytes()
@@ -48,7 +51,9 @@ async def calculate_sha256(file_path: str) -> str:
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)
# Guard against platforms (Windows, macOS) that lack posix_fadvise.
if hasattr(os, "posix_fadvise") and hasattr(os, "POSIX_FADV_DONTNEED"):
os.posix_fadvise(fd, 0, 0, os.POSIX_FADV_DONTNEED)
return sha256_hash.hexdigest()