[New-bugs-announce] [issue41732] Custom iterator to memoryview - performance improvement

[Diogo Flores]

New submission from Diogo Flores <dxflores at outlook.com>:

Hi,

Here's a patch that adds an iterator to memoryview, which makes iterating over memoryview objs considerably faster.

The following values result from a compilation with debug ON.

------------------------------------------------------------------------

Without patch:

cpython: ./python.exe -m timeit -s "a=memoryview(b'x'*1000000)" "for x in a: pass"
5 loops, best of 5: 98 msec per loop

cpython: ./python.exe -m timeit -s "a=b'x'*1000000" "for x in a: pass"
5 loops, best of 5: 68.6 msec per loop


With patch:

cpython: ./python.exe -m timeit -s "a=memoryview(b'x'*1000000)" "for x in a: pass"
5 loops, best of 5: 68.1 msec per loop

cpython: ./python.exe -m timeit -s "a=b'x'*1000000" "for x in a: pass"
5 loops, best of 5: 70 msec per loop

------------------------------------------------------------------------

Please let me know your thoughts regarding it.

Diogo

----------
messages: 376460
nosy: dxflores
priority: normal
severity: normal
status: open
title: Custom iterator to memoryview - performance improvement
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41732>
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