Making Rust respect worker count in config

[Martin von Zweigbergk]

Seems fine to do that every time we read configs in Python. It won't always
be correct if there are multiple values for it in different config files
(e.g. repo-specific vs user's config). Probably good enough.

On Thu, Nov 7, 2019, 07:54 Raphaël Gomès <raphael.gomes at octobus.net> wrote:

> I'd like to make Rust respect to max worker count in config, since it
> now runs parallel code. Right now, it uses every CPU available, be it
> logical or physical.
>
> I think the simplest way to do so, since Rust does not yet know how to
> read the config file, is to set the RAYON_NUM_THREADS environment
> variable in the Python layer as soon as possible.
>
> I'm unsure where to do it though and what the implications are
> cross-platform. Maybe as soon as the config is loaded?
>
> Thanks,
>
> Raphaël
>
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