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Mon Jan 29 11:21:20 EST 2018 · https://mail.python.org/pipermail/python-dev/2018-January/151982.html

I was going to argue, but it's not worth it. What you propose is fine.

On Sun, Jan 28, 2018 at 10:03 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 29 January 2018 at 14:43, Guido van Rossum <guido at python.org> wrote:
> > So why can't you just run "make test" if that's faster?
>
> I can (and do), but I also run it the other way if I need to pass
> additional options. I'll then notice that I forgot -j0, ctrl-C out,
> then run it again with -j0.
>
> That's a minor irritation for me, but for folks that don't already
> know about the -j0 option, they're more likely to just go "CPython's
> test suite is annoyingly slow".
>
> To provide a bit more detail on what I'd suggest we do:
>
> * "-j1" would explicitly turn off multiprocessing
> * "-j0" and "-jN" (N >= 2) would explicitly request multiprocessing
> and error out if there's a conflicting flag
> * not setting the flag would be equivalent to "-j0" by default, but
> "-j1" if a conflicting flag was set
>
> The testing options that already explicitly conflict with the
> multiprocessing option are:
>
> * -T (tracing)
> * -l (leak hunting)
>
> "-j1" would likely also be a better default when the verbosity flags
> are set (since the output is incredibly hard to read if you have
> multiple verbose tests running in parallel).
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
>

-- 
--Guido van Rossum (python.org/~guido)
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[Python-Dev] Making "-j0" the default setting for the test suite?