On Thu, 12 Sept 2024 at 09:31, Dima Pasechnik <dimp...@gmail.com> wrote:
>
> scipy itself is not built with configure/make, it's built with meson,
...
> There is no direct way to specify a non-default "-j" value, however it 
> appears to be possible to do this via meson,
> which invokes ninja via "meson compile".

How exactly does sage invoke the SciPy build?

It should be possible to pass -j through to the backend:

https://meson-python.readthedocs.io/en/latest/how-to-guides/meson-args.html#how-to-guides-meson-args

If Sage's make is already using parallelisation you probably want -j1
when building SciPy.

--
Oscar

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