Re: [PATCH v1 12/18] tests/vm: allow us to take advantage of MTTCG

[Robert Foley]

Reviewed-by: Robert Foley <robert.fo...@linaro.org>

On Mon, 22 Jun 2020 at 10:38, Alex Bennée <alex.ben...@linaro.org> wrote:
>
> We currently limit TCG guests to -smp 1 but now we have added some
> aarch64 guests we can do better when running on x86_64 hardware.
> Raise the limit for TCG guests when it is safe to do so.
>
> Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
> ---
>  tests/vm/basevm.py | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
> index 93859362606..dd96a6d4af6 100644
> --- a/tests/vm/basevm.py
> +++ b/tests/vm/basevm.py
> @@ -553,6 +553,12 @@ def parse_args(vmcls):
>      def get_default_jobs():
>          if kvm_available(vmcls.arch):
>              return multiprocessing.cpu_count() // 2
> +        elif os.uname().machine == "x86_64" and \
> +             vmcls.arch in ["aarch64", "x86_64", "i386"]:
> +            # MTTCG is available on these arches and we can allow more cores.
> +            # But only up to a reasonable limit. User can always override
> +            # these limits with --jobs.
> +            return min(multiprocessing.cpu_count() // 2, 8)
>          else:
>              return 1
>
> --
> 2.20.1
>
>