linux-kernel - Re: [PATCH v2] kunit: tool: Default --jobs to number of CPUs

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Message-ID: <CAFd5g44t5zxuLQ1jLVz7iQ1jKzm017W+hKWTt1Fzx-izAbdeJA@mail.gmail.com>
Date:   Tue, 14 Dec 2021 16:59:42 -0500
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     David Gow <davidgow@...gle.com>
Cc:     Daniel Latypov <dlatypov@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kunit: tool: Default --jobs to number of CPUs

On Sat, Dec 11, 2021 at 10:32 PM David Gow <davidgow@...gle.com> wrote:
>
> The --jobs parameter for kunit_tool currently defaults to 8 CPUs,
> regardless of the number available. For systems with significantly more
> (or less), this is not as efficient. Instead, default --jobs to the
> number of CPUs available to the process: while there are as many
> superstitions as to exactly what the ideal jobs:CPU ratio is, this seems
> sufficiently sensible to me.
>
> A new helper function to get the default number of jobs is added:
> get_default_jobs() -- this is used in kunit_tool_test instead of a
> hardcoded value, or an explicit call to len(os.sched_getaffinity()), so
> should be more flexible if this needs to change in the future.
>
> Signed-off-by: David Gow <davidgow@...gle.com>

Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>