Subj : Re: 1-wire behaviour on Bookworm
To   : druck
From : Lawrence D'Oliveiro
Date : Thu Sep 19 2024 23:50:33

On Thu, 19 Sep 2024 10:36:16 +0100, druck wrote:

> With the Pi 3B, I could either read the sensors sequentially taking
> about 0.9s each, or using threads simultaneously in 1.0s. The Pi 4B with
> Bookworm reads the sensors sequentially a shade faster at just over
> 0.8s, but when reading simultaneously, returns 2 after 0.8s, another 2
> after 1.6s and the last two at 2.4s.

Is this Python code? Python threading cannot currently take full advantage
of multiple CPUs, owing to having to serialize all interpreter operations
through the “Global Interpreter Lock”.

This is going to be fixed from 3.13 onwards.

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