Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Revision 4f1903061877776973c1bbfadd3d3f146920856e authored by Inada Naoki on 02 March 2019, 04:31:01 UTC, committed by GitHub on 02 March 2019, 04:31:01 UTC
It is changed from 16KiB to 64KiB. The previous default value is used since 1990. coreutils chose 128 KiB as minimum buffer size for block device I/O. But shutil.copyfileobj() can be used for non block devices. So I choose more conservative value. As my quick benchmark, performance difference between 64KiB and 128 KiB is up to ~5%. On the other hand, performance difference between 32 KiB and 64 KiB can be more than 10% when file is fully buffered. This is why 64 KiB is rational value.
1 parent bcfa450
Tip revision: 4f1903061877776973c1bbfadd3d3f146920856e authored by Inada Naoki on 02 March 2019, 04:31:01 UTC
bpo-36103: change default buffer size of shutil.copyfileobj() (GH-12115)
bpo-36103: change default buffer size of shutil.copyfileobj() (GH-12115)
Tip revision: 4f19030
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