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bpo-38319: Fix shutil._fastcopy_sendfile(): set sendfile() max block size #16491

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Merged
giampaolo merged 6 commits into from
Oct 1, 2019
Merged

bpo-38319: Fix shutil._fastcopy_sendfile(): set sendfile() max block size #16491

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d5fc0e9
set blocksize max 2G
giampaolo Sep 30, 2019
5ea0ee1
add news entry
giampaolo Sep 30, 2019
549e508
use power of 2; catch OSError
giampaolo Sep 30, 2019
49e6684
use binary prefixes
giampaolo Sep 30, 2019
222a267
only limit blocksize to 1GiB for 32 archs
giampaolo Sep 30, 2019
6614996
add comments
giampaolo Oct 1, 2019
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only limit blocksize to 1GiB for 32 archs
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@giampaolo
giampaolo committed Sep 30, 2019
commit 222a267e5aa4f72f36be1b188f207e7f0803ee5d
3 changes: 2 additions & 1 deletion Lib/shutil.py
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Expand Up @@ -136,7 +136,8 @@ def _fastcopy_sendfile(fsrc, fdst):
# changes while being copied.
try:
blocksize = max(os.fstat(infd).st_size, 2 ** 23) # min 8MiB
blocksize = min(blocksize, 2 ** 30) # max 1GiB
if sys.maxsize < 2 ** 32: # 32-bit architecture
blocksize = min(blocksize, 2 ** 30) # max 1GiB

@vstinner vstinner Sep 30, 2019

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Can you please add a comment explaining this 1 GiB limit?

except OSError:
blocksize = 2 ** 27 # 128MB

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