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Faster ElementTree deepcopying #70057

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serhiy-storchaka opened this issue Dec 15, 2015 · 3 comments
Closed

Faster ElementTree deepcopying #70057

serhiy-storchaka opened this issue Dec 15, 2015 · 3 comments
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extension-modules C modules in the Modules dir performance Performance or resource usage

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BPO 25869
Nosy @brettcannon, @scoder, @serhiy-storchaka
Files
  • bench_etree_deepcopy.log: Benchmark results
  • etree_deepcopy.patch
  • etree_deepcopy2.patch
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2015-12-21.11:50:59.673>
created_at = <Date 2015-12-15.10:48:06.969>
labels = ['extension-modules', 'performance']
title = 'Faster ElementTree deepcopying'
updated_at = <Date 2015-12-21.11:50:59.672>
user = 'https://github.com/serhiy-storchaka'

    bugs.python.org fields:

    activity = <Date 2015-12-21.11:50:59.672>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2015-12-21.11:50:59.673>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2015-12-15.10:48:06.969>
creator = 'serhiy.storchaka'
dependencies = []
files = ['41315', '41316', '41317']
hgrepos = []
issue_num = 25869
keywords = ['patch']
message_count = 3.0
messages = ['256455', '256459', '256796']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'scoder', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue25869'
versions = ['Python 3.6']
    @serhiy-storchaka
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    According to lxml benchmark [1], deepcopying a tree in ElementTree is about 20 times slower than in lxml. Proposed patch optimizes deepcopying C implementation of ElementTree about 20 times. It is now 5% to 3 times faster than in lxml.

    [1] http://lxml.de/performance.html

    @serhiy-storchaka serhiy-storchaka added extension-modules C modules in the Modules dir performance Performance or resource usage labels Dec 15, 2015
    @serhiy-storchaka
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    Updated patch correctly handles rare cases when different elements share the same attrib dict and when the same Element is occurred on different places in ElementTree (that is no longer a tree, but a directed graph).

    @python-dev
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    python-dev mannequin commented Dec 21, 2015

    New changeset 090c3e3a648d by Serhiy Storchaka in branch 'default':
    Issue bpo-25869: Optimized deepcopying ElementTree; it is now 20 times faster.
    https://hg.python.org/cpython/rev/090c3e3a648d

    @serhiy-storchaka serhiy-storchaka self-assigned this Dec 21, 2015
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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