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Dear users,
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<div>Yesterday I wanted to perform a small calculation on a centred Pt13 nanoparticle in a 20 Å box, I tried QE 7.1 and QE 7.2 with the exact same input, hardware and parallelisation parameters. 7.2 end up being much slower: </div>
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<div>QE 7.1:</div>
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<div>15th iter: 100.5 secs</div>
<div>30th iter: 184.2 secs</div>
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<div>QE 7.2:</div>
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<div>15th iter: 463.5 secs</div>
<div>30th iter: 824.4 secs</div>
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<div>But QE 7.2 converge the SCF in fewer steps (still ends up being much slower). I reproduced this behaviour on 2 other machines and playing with parallelisation parameters doesn’t change anything. How to explain this?</div>
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<div>Best regards,</div>
<div>Tom Demeyere</div>
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