<div>Dear Lorenzo,</div><div>Are you sure that you need these tight cutoffs (EPS_DEFAULT and especially EPS_PGF_ORB)? Can you check how many integrals are recalculated (check the output file)? If they are, is it possible for you to increase MAX_MEMORY? How are you running CP2K (number of MPI ranks, number of OpenMP threads)?</div><div>Best,</div><div>Frederick</div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">Lorenzo Lagasco schrieb am Dienstag, 28. April 2026 um 15:43:45 UTC+2:<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 dir="ltr"><div><div><div></div></div></div><div><div><div><div dir="auto"><div><div><p>Good afternoon everyone,</p>
<p>I am writing to ask for advice on how to improve the computational efficiency of an HSE06 calculation used to evaluate inter-state couplings between diabatic states in a slab–organic dye system (using the Kondov diabatization scheme, system containing 395 atoms). I have attached the input file for reference. In a preliminary test on a CPU-only machine (single node with 52 processors), a single SCF iteration takes approximately 30 minutes.</p>
<p>Any suggestions would be greatly appreciated.<br><br></p><p>Best regards</p><p>Lorenzo Lagasco</p></div></div></div></div></div></div><br><br></div>
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