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Can you provide a source for that? I have found the performance between FreeBSD and Linux to be comparable, even when using Python.

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I also thought this was bollocks so have just been running pyperformance on a virtualised arm64. I have some figures from Linux running on the same platform. I've not been very scientific about it.

FreeBSD is consistently slower. Between 20-50% across the board. I must admit I'm amazed that Python spends enough time calling into the OS to make a difference this big. Perhaps it's a problem with libc? Maybe there's something going on with memory barriers? My "fist unix" was FreeBSD so I'm amazed and just a bit gutted.

Note the other replies @ parent. It seems to be a virtualization specific issue.

To replicate, create two qemu vms. One ubuntu 22.04, one fbsd13.1.

Install any python starting from 3.9

Write a function to sum the first 50_000_000 integers, run it on both.

Maybe, it is QEMU/FreeBSD problem, not FreeBSD/Python one?

I'm using FreeBSD for 20+ years on real hardware and never seen huge performance differences for all common software, which is not using CUDA or alike.

Thanks for that. I found some fbsd forum posts about this, but they also mentioned virtualization.

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