[QE-users] there are process with no planes

[Lorenzo Paulatto]

You are using more CPUs than there are planes of charge density in the FFT grid. Use less cpu or "-pd .true." option

hth
Dr. Lorenzo Paulatto
IdR @ IMPMC - CNRS UMR 7590 & Sorbonne Université
phone: +33 (0)1 442 79822 / skype: paulatz
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On Dec 7 2021, at 10:49 am, Michal Husak <Michal.Husak at vscht.cz> wrote:
> I am trying to run QE 6.8 on a supercomputer node with 128 cores ...
> I use pure MPI parallelization
> Run on 16 and 32 cores works OK ...
>
> Run on 64+ cores ends with following error:
> Error in routine fft_type_set (6):
> there are processes with no planes. Use pencil decomposition (-pd .true.)
>
> Can anybody explain what it means ?
> Is my system to simple to it can not feed all cores ?
> Where can I enter the -pd .true. option ?
>
> Michal Husak
> UCT Prague
>
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