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gh-117151: increase default buffer size of shutil.copyfileobj() to 256k. #119783

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Merged
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Oct 4, 2024
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gh-117151: increase default buffer size of shutil.copyfileobj() to 256k. #119783

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gh-117151: increase default buffer size of shutil.copyfileobj() to 256k.
rmmancom Apr 30, 2024
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rmmancom Oct 3, 2024
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2 changes: 1 addition & 1 deletion Lib/shutil.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@
else:
_winapi = None

COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 64 * 1024
COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 256 * 1024
# This should never be removed, see rationale in:
# https://bugs.python.org/issue43743#msg393429
_USE_CP_SENDFILE = (hasattr(os, "sendfile")
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2024-10-03-05-00-25.gh-issue-117151.Prdw_W.rst
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@@ -0,0 +1,3 @@
The default buffer size used by :func:`shutil.copyfileobj` has been
increased from 64k to 256k on non-Windows platforms. It was already larger
on Windows.
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