<div>Due to my lack of experience, I can just guess from my knowledge on RI methods, the manual and what I was told by the developer. Please also consider the respective manual page: https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/XC/HF/RI.html#CP2K_INPUT.FORCE_EVAL.DFT.XC.HF.RI .<br /></div><div>- Change RI_METRIC to TRUNCATED and CUTOFF_RADIUS in the &RI section to a value between 1.0 and 2.0 . Lower values improve sparsity, larger values increase accuracy. The shortrange Coulomb metric has a rather large range. If you would like to stick to it, set the OMEGA parameter of the &RI section to a value larger then 0.11 (let's say 1-10).<br /></div><div>- Just for testing, try a single k-point.</div><div>- Try other values of MEMORY_CUT in &RI. Larger values (try 10) should decrease the block sizes. I do not really know how it works but it does have an effect on memory usage.</div><div>- Increase EPS_FILTER in &RI to a larger value (double-check later whether you have to decrease it again).</div><div>If nothing of my suggestions work and the developer of the feature does not chime in, it may be that you do not have enough memory.</div><div>Best,</div><div>Frederick<br /></div><div><br /></div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">Frederick Stein schrieb am Sonntag, 15. September 2024 um 18:42:31 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>Hi,</div><div>I am not an expert with RI-HFX but I would try to run potentially cheaper settings first (single k-point, smaller basis sets, larger value of omega, identity metric). It may also help to have an CP2K output file or supplementary input/output file if you submit jobs with a scheduler like Slurm. If there is no function stack in the output file(s) given (either by the compiler or by CP2K), you could also add the keywords TRACE and TRACE_MASTER to your GLOBAL section.</div><div>Best,</div><div>Frederick<br></div><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">yj jiang schrieb am Sonntag, 15. September 2024 um 18:13:42 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">Hi, I'm calculating band structure for C3N4 with a Ni atom (attachment). I want to use HES06 + RI-HFX + ADMM. There is a "out of memory" error. How can I address this? Thx. a lot.<div><br></div><div>I can access a hpc with max memory of 512G.</div></blockquote></div></blockquote></div>
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