mirror of
https://github.com/triqs/dft_tools
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77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
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/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by M. Ferrero, O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef FULL_UPDATE_H_jh93n8
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#define FULL_UPDATE_H_jh93n8
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/*
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* Usage : create such an object
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* transform it into boost::function<bool()> and pass it as AfterCycleDuty
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*/
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class full_update_mechanism {
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int iter_fastup,nfastup;
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double FullUpdate_diff_ALERT, FullUpdate_diff_increase, FullUpdate_diff_reduce;
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triqs::utility::report_stream & REPORT;
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public :
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full_update_mechanism (triqs::utility::report_stream & rep_,
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int NbreFastIteration_Init, int FullUpdate_diff_ALERT_, int FullUpdate_diff_increase_, int FullUpdate_diff_reduce_): REPORT(rep) {
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// fast update mechanism
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nfastup=NbreFastIteration_Init;
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iter_fastup=0;
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FullUpdate_diff_ALERT = FullUpdate_diff_ALERT_;
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FullUpdate_diff_increase= FullUpdate_diff_increase_;
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FullUpdate_diff_reduce = FullUpdate_diff_reduce_;
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}
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virtual ~full_update_mechanism() {}
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virtual double fullUpdate(){return 0;}
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bool operator()() {
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//Update the FullUpdate data if necessary
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iter_fastup++;
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// Here we take some decision, depending whether nfastup is too big, too small ,etc
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if ((nfastup>=0) && (iter_fastup>=nfastup)) {
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iter_fastup=0;
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// Now updating cleanly
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double diff=this->fullUpdate();
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//REPORT << "Full update done" << endl;
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if (diff > FullUpdate_diff_ALERT)
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REPORT <<"Full update : diff="<< diff <<" WARNING : Fast Update deviation too big "<<endl;
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bool bo=false;
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if (diff < FullUpdate_diff_increase) {bo=true; nfastup=2*nfastup;}
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if (diff > FullUpdate_diff_reduce) {bo=true;nfastup=max(1,nfastup/2);}
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if (bo) {
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REPORT << "diff="<<diff<<endl;
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REPORT << "New number of fast updates : "<< nfastup<<endl<<endl;
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}
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}
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};
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#endif
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