Dear all,<div>I forgot to mention that I'm using the toolchain:</div><div>cmake-3.18.5
cosma-2.2.0
elpa-2020.05.001
fftw-3.3.8
gsl-2.6
hdf5-1.12.0
libint-v2.6.0-cp2k-lmax-5
libvdwxc-0.4.0
libvori-201229
libxc-4.3.4
libxsmm-1.16.1
openblas-0.3.10
scalapack-2.1.0
sirius-7.0.0
SpFFT-0.9.13
spglib-1.16.0 </div><div><br></div><div>and gcc-8.3.0 + openmpi 4.1.0.</div><div><br></div><div>Best regards,</div><div>Mauro.</div><div> <br></div><div><br></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">Il giorno lunedì 22 febbraio 2021 alle 10:59:47 UTC+1 Mauro Sgroi ha scritto:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Dear all,<div>I'm testing the xTB code on a liquid electrolyte containing a Li ion.</div><div>I'm running MD on a cell containing 728 atoms.</div><div>I obtain a disappointing scaling with the number of cores. The following are times for 100 MD steps:</div><div><br></div><div><div>cores Time (s)</div><div>28 7818 </div><div>56 7364</div><div>84 6529</div><div>112 7493</div></div><div><br></div><div>My input file can be downloaded here: </div><div><br></div><div><a href="https://drive.google.com/file/d/1KvZz5x6FwgOP3dzH6fePghMQBineIlfE/view?usp=sharing" target="_blank" rel="nofollow" data-saferedirecturl="https://www.google.com/url?hl=it&q=https://drive.google.com/file/d/1KvZz5x6FwgOP3dzH6fePghMQBineIlfE/view?usp%3Dsharing&source=gmail&ust=1614074572526000&usg=AFQjCNHGYwrwTV0kniKuid71trOO26gX1g">https://drive.google.com/file/d/1KvZz5x6FwgOP3dzH6fePghMQBineIlfE/view?usp=sharing</a></div><div><br></div><div>Is this the right behaviour to be expected? Or is there is something wrong in my compilation of the code or in the input file? </div><div>The HPC facility has a Infinband network protocol and a fast shared filesystem.</div><div><br></div><div>Thanks a lot in advance and best regards,</div><div>Mauro Sgroi.</div><div><br></div><div><br></div><div><br></div></blockquote></div>