Arham,
It should be balanced: the default mapping is to allocate NUMA packages
round robin.
you can
mpirun --report-bindings -n 28 true
to have Open MPI report the bindings
or
mpirun --tag-output -n 28 grep Cpus_allowed_list /proc/self/status
to have each task report which physical cpu it is bound.
Cheers,
Gilles
On Sat, Nov 26, 2022 at 5:38 PM Arham Amouei via users <
users@lists.open-mpi.org> wrote:
> Hi
>
> If I run a code with
>
> mpirun -n 28 ./code
>
> Is it guaranteed that Open MPI and/or OS give equal number of processes to
> each socket? Or I have to use some mpirun options?
>
> Running the code with the command given above, one socket gets much hotter
> than the other (60°C vs 80°C). I'm sure that the code itself divides the
> job equally among the processes.
>
> The system is Dell Precision 7910. Two Xeon E5-2680 v4 and two 16GB 2400
> RAM modules are installed. There are a total number of 28 physical cores.
> The total number of logical cores is 56. The OS is Ubuntu 22.04.
>
> Thank in advance
> Arham
>
>
>
>
