<div>Dear Somayeh,</div><div>Generally, there a bunch of changes between versions 7 and 2025.2 making it hard to tell what the exact issue is. Can you provide more details regarding</div><div>- What hardware are you running on?</div><div>- How many atoms (or molecules etc.) does you system contain? My first guess considering your box size size and your files names is ca. 4096 H2O molecules.</div><div>- How did you compile CP2K in both cases?</div><div>- Can you provide profiles? It might already help to run CP2K in ENERGE_FORCE mode instead of MD to get some ideas.</div><div>Best,</div><div>Frederick</div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">Somayeh Ahmadkhani schrieb am Dienstag, 12. August 2025 um 09:23:10 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;"><p>Dear CP2K developers and users,</p>
<p>I am running CP2K for a water system containing approximately 2,600 molecules.<br>
With CP2K version 7, I was able to save around 50 steps in a 12-hour run. However, after switching to a newer version, I now obtain data for only 2 steps in the same 12-hour period. Furthermore, when using the DFT-D4 correction, I can only obtain 1 step per 12 hours.</p>
<p>Could you please help me understand and resolve this performance issue?<br>
I have attached my SBATCH script and input file for more details, in case they are useful.</p>
<p>Thank you in advance for your support.</p>
<p>Best regards,</p>my SBATCH script is as follows<br><br>
<p>#!/bin/bash</p>
<p>#SBATCH --job-name=cp2k</p><p>#SBATCH --ntasks=64</p>
<p>#SBATCH --mem=300G</p>
<p>#SBATCH --nodes=4</p>
<p>#SBATCH --time=12:00:00</p>
<p>#SBATCH --error=cp2k_job.err</p>
<p>module load intel/</p>
<p>module load impi/2021.14</p>
<p>module load cp2k/2025.1</p>
<p>export <b>OMP_NUM_THREADS</b>=1</p>
<p>ulimit -s unlimited</p>
<p>mpirunĀ cp2k.psmp -i PBE_water.inp -o out_put.out</p></blockquote></div>
<p></p>
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