[New-bugs-announce] [issue28832] Reduce memset in dict creation

INADA Naoki report at bugs.python.org
Tue Nov 29 07:56:55 EST 2016


New submission from INADA Naoki:

This patch delays initialization of dk_entries.
Entries are initialized when first use (when dk_netries is incremented).

Minimum dk_entries of 64bit arch is 5 * 8 * 3 = 120bytes.
So it can save 4 cache lines!

I'm running benchmark for now.

----------
assignee: inada.naoki
components: Interpreter Core
files: reduce-memset.patch
keywords: patch
messages: 281989
nosy: inada.naoki
priority: normal
severity: normal
stage: patch review
status: open
title: Reduce memset in dict creation
type: performance
versions: Python 3.7
Added file: http://bugs.python.org/file45687/reduce-memset.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28832>
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