<div dir="ltr"><div class="gmail_default" style="font-family:monospace,monospace">Seems like symmetric partitioning of the basis set leaves no plane waves for some processors. You can just raise the cutoff.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 4, 2021 at 12:04 AM SYED ZAIN MEHMOOD <<a href="mailto:szain@phys.qau.edu.pk">szain@phys.qau.edu.pk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I was vc-relaxing a bulk structure of a Rare Earth element "Gd" and it was taking so long for <u>48 processors</u>. Now when i tried to run <b>pw.x</b> on <u>240 processors</u> there occurred an error as follows<br><br><div>" from n_plane_waves : error # 1<br> No plane waves found: running on too many processors? "<div><br></div></div><div>I have searched through the mail archives and found a 10 years old thread about it, a useful discussion between <span style="color:rgb(29,66,71);font-family:Arial;font-weight:700">Payam Norouzzadeh</span><span style="color:rgb(29,66,71);font-family:Arial;font-size:16px"> </span><span style="color:rgb(29,66,71);font-family:Arial">and </span><span style="color:rgb(29,66,71);font-family:Arial"><b>Paolo Giannozzi. </b></span>Though it was suggested to reduce the number of processors, the issue was gone.</div><div> 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 ? </div></div>
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