[issue44037] Broad performance regression from 3.10a7 to 3.10b1 with python.org macOS binaries

[Brandt Bucher]

Change by Brandt Bucher :


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nosy: +brandtbucher

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[issue44037] Broad performance regression from 3.10a7 to 3.10b1 with python.org macOS binaries

[STINNER Victor]

Change by STINNER Victor :


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nosy:  -vstinner

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[issue44037] Broad performance regression from 3.10a7 to 3.10b1 with python.org macOS binaries

[Raymond Hettinger]

Raymond Hettinger  added the comment:

> There is no reason to suspect a general Python performance regression
> on this benchmark between a7 and b1.

Pablo just ran the same benchmarks on Arch Linux and did not observe the 
degradation, so this does seem specific to the macOS build.

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nosy: +ronaldoussoren

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[issue44037] Broad performance regression from 3.10a7 to 3.10b1 with python.org macOS binaries

[Ned Deily]

Ned Deily  added the comment:

Thanks for the report, Raymond, and for taking the time to check performance.

I am able to reliably reproduce the slowdowns in the benchmark between the 
3.10.0a7 and 3.10.0b1 versions provided by the macOS installers on python.org. 
A similar slowdown is seen on both Intel and Apple Silicon Macs running macOS 
11.3.1. Doing a quick build from source, I see no similar large differences 
between 3.10.0a7 and 3.10.0b1 on either macOS (with XC 12.5 Clang 12.0.5) or on 
a Debian Linux VM (with GCC 10.2.1). So it does seem to a difference in how the 
two macOS installers were built. There were some changes in the build env and 
process between a7 and b1. I will investigate further and report back here. 
But, the good news is that, AFAICT, there is no reason to suspect a general 
Python performance regression on this benchmark between a7 and b1.

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assignee:  -> ned.deily
priority: normal -> critical
title: Broad performance regression from 3.10a7 to 3.10b1 -> Broad performance 
regression from 3.10a7 to 3.10b1 with python.org macOS binaries

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