<div dir="auto"><div>OT should certainly be fast for a large band gap system like Al2O3. You said that the speed of the scf iterations are slower, but is the full scf convergence also slower? Things to consider are your preconditioner and your outer loops I think. Full_single_inverse will be less effective than Full_all in most situations. Generally use Full_all unless your system is very large. Maybe also try reducing your max inner SCF cycles and increasing your outer loop number. It could be that your initial state is not so good, and so resetting often using more frequent outer loops will help. <br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Feb 15, 2020, 5:59 AM MD Simulation <<a href="mailto:mdsimula...@gmail.com">mdsimula...@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Does anyone know if the OT method could be used for aluminum oxide (Al2O3)? It seemed a bit slow when I tried it compared to using SMEAR.<div><br></div><div>Here's my two SCF solving routines, the OT method is slow, ~9s per SCF iteration, while the SMEAR method is ~3s per SCF iteration. Thanks for the help.</div><div><br></div><div>#### OT</div><div><div> &SCF</div><div> SCF_GUESS ATOMIC</div><div> EPS_SCF 1.0E-8</div><div> MAX_SCF 200</div><div> &OT ON</div><div> MINIMIZER DIIS</div><div> PRECONDITIONER FULL_SINGLE_INVERSE</div><div> &END OT</div><div> &OUTER_SCF</div><div> MAX_SCF 10</div><div> EPS_SCF 1.0E-8</div><div> &END OUTER_SCF</div><div> &END SCF</div></div><div>####</div><div><br></div><div>#### Fast SMEAR</div><div><div> &SCF</div><div> SCF_GUESS ATOMIC</div><div> EPS_SCF 1.0E-8</div><div> MAX_SCF 200</div><div> ADDED_MOS 10</div><div> &DIAGONALIZATION ON</div><div> ALGORITHM STANDARD</div><div> &END DIAGONALIZATION</div><div> &MIXING .TRUE.</div><div> METHOD BROYDEN_MIXING</div><div> ALPHA 0.4</div><div> NBROYDEN 8</div><div> &END MIXING</div><div> &SMEAR ON</div><div> METHOD FERMI_DIRAC</div><div> ELECTRONIC_TEMPERATURE [K] 300.0</div><div> &END SMEAR</div><div> &END SCF</div></div><div>####</div></div>
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