[CP2K-user] [CP2K:15319] Many SCF cycles in each geometry optimization step

[Thomas Kühne]

Dear Hongyang, 

you have given the answer to your own question, the observed behavior is a consequence 
of the employed geometry optimizer. LBFGS, is typically faster anyhow, which is not only 
due to the algorithm, but also due to the particular implementation. 

Best, 
Thomas

> Am 10.05.2021 um 07:39 schrieb ma... at gmail.com <ma455... at gmail.com>:
> 
> Hi,
> 
> I'm a new user of cp2k 8.1. I'm calculating a P doped Si system (output file attached). The system contains 1000 atoms. The calculation goes well and the SCF converges fairly smoothly. However, different from my previous calculations, I found in this calculation there are many SCF cycles (SCF converged again and again) for each geometry optimization step. In my previous calculations, the basic steps are: SCF ->  OPTIMIZATION STEP 1 -> SCF -> OPTIMIZATION STEP 2 -> SCF -> OPTIMIZATION STEP 3. But in this calculation, the steps are: SCF -> OPTIMIZATION STEP 1 -> SCF (converged) -> SCF (converged) -> SCF (converged) -> SCF (converged) ...... -> OPTIMIZATION STEP 2. I suspect this maybe caused by the different OPTIMISER. In my previous calculations, I used BFGS. But in this calculation I used LBFGS. However, based on the tutorial, LBFGS should be faster in large system calculation but the results are not what I expected. Could someone please provide some suggestions on improving this issue? Thanks
> 
> Regards,
> Hongyang
> 
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> <s5-hse-01-out.txt>



==============================
Thomas D. Kühne
Dynamics of Condensed Matter
Chair of Theoretical Chemistry
University of Paderborn
Warburger Str. 100
D-33098 Paderborn
Germany
thomas... at upb.de
+49/(0)5251/60-5726

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