Hi Mostafa<div><br></div><div>Cell size directly affects your calculation times. If you double a side for a cubic cell, I would naively expect scaling on the order of O(3) or as the cube. It's a bit more complicated, but keep the cells as small as possible. Note that there is no separate simulation box in cp2k: cell in sold state physics sense equals cp2k simulation box. If you don't have a repeating cell, add <font face="Courier New">PERIODIC NONE</font>.<br><br></div><div><div>Kind Regards</div><div><br></div><div>Sam</div></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, June 13, 2022 at 8:47:24 PM UTC+2 abedimo...@gmail.com wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div>Hi Everyone,</div><div>I've been trying to get the potential energies and forces for a certain number of atoms at different mass densities, from high to very low, under PBC. I've realized that as the cell size gets larger (going to the lower densities) the computational time and particularly the required memory increases. Now I have a cell with the length of 60
<span>Å</span>
and it can not be run because it asks a lot of memory. I wonder if there is any correlation between the cell size and computational time/required memory and if so, how it scales. I should say I could mange to run the case with the cell size of 50 x 50
x
50
<span>Å. Thanks.</span></div><div><span><br></span></div><div><span>Best,</span></div><div><span>Mostafa<br></span>
</div></blockquote></div>
<p></p>
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