[QE-users] No plane waves found: running on too many processors?

[Ilya Ryabinkin]

Seems like symmetric partitioning of the basis set leaves no plane waves
for some processors. You can just raise the cutoff.

On Wed, Aug 4, 2021 at 12:04 AM SYED ZAIN MEHMOOD <szain at phys.qau.edu.pk>
wrote:

> I was vc-relaxing a bulk structure of a Rare Earth element "Gd" and it was
> taking so long for *48 processors*. Now when i tried to run *pw.x* on *240
> processors* there occurred an error as follows
>
> " from n_plane_waves : error #         1
>      No plane waves found: running on too many processors?   "
>
> I have searched through the mail archives and found a 10 years old thread
> about it,  a useful discussion between Payam Norouzzadeh and *Paolo
> Giannozzi. *Though it was suggested to reduce the number of processors,
> the issue was gone.
>  I want to ask the reason for the error in the first place. Is Quantum
> ESPRESSO limited to some specific maximum number of processors that it can
> use ? If it is so, how many maximum processors can be used ?
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