[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Louis Huemiller added the comment: Reinstalled the server I'd been using for this issue, with Ubuntu 18.04.3 LTS Server amd64. This installation already came with Python3.6.8. Downloaded and installed Python3.7.3 and 3.8.0 from: https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz h

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Louis Huemiller added the comment: Thank you for looking into the potential issue. Instead of getting Python3.8 from ppa:deadsnakes/ppa, I downloaded the source from: https://www.python.org/ftp/python/3.8.0/Python-3.8.0rc1.tgz Then did the following to build and install it: $ cd /usr/sr

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Change by Gregory P. Smith : -- resolution: -> not a bug stage: -> resolved status: open -> closed ___ Python tracker ___ ___ Pyth

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Gregory P. Smith added the comment: If I compile my own 3.7.5 and 3.8.0 both with --enable-optimizations, I am unable to reproduce this. greg@zoonaut:~/sandbox/python/cpython/lh$ ../b37/python permutations2x2 --max_depth 6 | egrep "^# Total_Time" # Total_Time: 75.92 greg@zoonaut:~/sandbox/py

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Inada Naoki added the comment: Deadsneak Python 3.8: >>> sysconfig.get_config_var('CFLAGS') '-Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security' Disco /usr/bin/python3.7: >>> sysconfig.get_config_var('CFLAGS') '-Wno

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Inada Naoki added the comment: Ah, my bad. I meant `perf stat python ...`. -- ___ Python tracker ___ ___ Python-bugs-list mailing

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Inada Naoki added the comment: I can not confirm performance regression in 3.8.0. $ time ~/pyenv/versions/3.7.3/bin/python permutations2x2 --max_depth 6 | egrep "^# Total_Time" ; time ~/pyenv/versions/3.8.0/bin/python permutations2x2 --max_depth 6 | egrep "^# Total_Time" # Total_Time: 50.24

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Change by Inada Naoki : -- nosy: +inada.naoki ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.py

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Louis Huemiller added the comment: Each of the Python runs mentioned in the initial post took around 4 hours to execute. Although not as accurate, the issue can be demonstrated in less than 5 minutes through the use of: # If needed use the following to install Python3.8.0rc1 $ apt-get up

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

Louis Huemiller added the comment: Attached is a chart, which shows the results from the runs mentioned in the initial post. This chart was produced through the use of: ../permutations2x2_chart_results \ -f ./20191011b_chart.svg \ C++unordered_map:./20191011b_magiccube2x2_permutation

[issue38477] magiccube2x2 permutations 28% slower with Python 3.8.0rc1 vs 3.7

New submission from Louis Huemiller : Have created a program that by brute force determines all reachable states of a 2-by-2 MagicCube, sometimes referred to as a 2x2 Rubick's cube. On one of my servers, which is described in the attached file 20191011b_configuration, this program takes 19520