GlobalMasterFreeEnergy.C

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/*
   Forwards atoms to master node for force evaluation.
*/

#include <string.h>
#include "InfoStream.h"
#include "NamdTypes.h"
#include "FreeEnergyEnums.h"
#include "FreeEnergyAssert.h"
#include "FreeEnergyGroup.h"
#include "Vector.h"
#include "FreeEnergyVector.h"
#include "FreeEnergyRestrain.h"
#include "FreeEnergyRMgr.h"
#include "FreeEnergyLambda.h"
#include "FreeEnergyLambdMgr.h"
#include "GlobalMaster.h"
#include "GlobalMasterFreeEnergy.h"
#include "FreeEnergyParse.h"

#include "Node.h"
#include "Molecule.h"
#include "ReductionMgr.h"
#include "SimParameters.h"

#include <stdio.h>

//#define DEBUGM
#define MIN_DEBUG_LEVEL 1
#include "Debug.h"


void GlobalMasterFreeEnergy::update() {
//-----------------------------------------------------------------
// get lambdas from LambdaManager, inform RestraintManager.
// calculate gradients for each center-of-mass of each restraint,
// and apply the forces to the atoms involved
//-----------------------------------------------------------------
  double  LambdaKf, LambdaRef;
  double  Sum_dU_dLambdas;

  if (m_LambdaManager.GetLambdas(LambdaKf, LambdaRef)) {

    // stuff that's done every time step
    m_RestraintManager.SetLambdas(LambdaKf, LambdaRef);
    m_RestraintManager.UpdateCOMs(*this);
    m_RestraintManager.AddForces(*this);
    if (m_LambdaManager.IsTimeToClearAccumulator()) {
      m_LambdaManager.ZeroAccumulator();
    }
    Sum_dU_dLambdas = m_RestraintManager.Sum_dU_dLambdas();
    m_LambdaManager.Accumulate(Sum_dU_dLambdas);

    // for integrating all the MCTI averages
    if (m_LambdaManager.IsEndOf_MCTI_Step()) {
      m_LambdaManager.Integrate_MCTI();
    }

    // stuff that's done when it's time to print
    if (m_LambdaManager.IsFirstStep()) {
      m_LambdaManager.PrintLambdaHeader(simParams->dt);
    }
    if (m_LambdaManager.IsTimeToPrint()) {
      m_LambdaManager.PrintHeader(simParams->dt);
      if (m_LambdaManager.IsTimeToPrint_dU_dLambda()) {
        m_RestraintManager.Print_dU_dLambda_Info();
        if (m_RestraintManager.ThereIsAForcingRestraint()) {
          m_LambdaManager.Print_dU_dLambda_Summary(Sum_dU_dLambdas);
        }
      }
      else {
        m_LambdaManager.PrintSomeSpaces();
      }
      m_RestraintManager.PrintEnergyInfo();
      m_RestraintManager.PrintRestraintInfo();
      if (m_LambdaManager.IsEndOf_MCTI()) {
        m_LambdaManager.Print_MCTI_Integration();
      }
    }
  }
}


void GlobalMasterFreeEnergy::user_initialize() {
//-----------------------------------------------------------------
// read all the input from config
//-----------------------------------------------------------------

  iout << iINFO << "  FREE ENERGY PERTURBATION CONFIG\n"; 
  iout << iINFO << "***********************************\n"; 
  int config_len = strlen(config);
  if ( config_len < 10000 ) {
    iout << config;
  } else {
    char *new_config = new char[10000 + 10];
    strncpy(new_config,config,10000);
    new_config[10000] = 0;
    strcat(new_config,"\n...\n");
    iout << new_config;
    delete [] new_config;
  }
  iout << iINFO << "***********************************\n" << endi; 

  ReadInput(config, m_RestraintManager, m_LambdaManager, *this, simParams->dt);

  // exit if there aren't enough steps to complete all pmf & mcti blocks
  int Total = m_LambdaManager.GetTotalNumSteps();
  if (Total > simParams->N) {
    iout << "FreeEnergy: Not enough steps to complete pfm & mcti blocks" << std::endl;
    iout << "FreeEnergy:   Num Steps Needed =    " << Total << std::endl;
    iout << "FreeEnergy:   Num Steps Requested = " << simParams->N << std::endl << endi;
    NAMD_die("FreeEnergy: Fatal Run-Time Error");
  }
}


void GlobalMasterFreeEnergy::user_calculate() {
//-----------------------------------------------------------------
// this is what's executed every time-step
//-----------------------------------------------------------------
  m_LambdaManager.IncCurrStep();
  update();
}


int GlobalMasterFreeEnergy::
	getAtomID(const char *segid, int resid, const char *aname)
{
  return molecule->get_atom_from_name(segid,resid,aname);
}

int GlobalMasterFreeEnergy::
	getNumAtoms(const char* segid, int resid) // 0 on error
{
  return molecule->get_residue_size(segid,resid);
}

int GlobalMasterFreeEnergy::
	getAtomID(const char *segid, int resid, int index)
{
  return molecule->get_atom_from_index_in_residue(segid,resid,index);
}

double GlobalMasterFreeEnergy::getMass(int atomid)
{
  if ( atomid < 0 || atomid >= molecule->numAtoms ) return -1.;  // failure
  return molecule->atommass(atomid);
}


int GlobalMasterFreeEnergy::requestAtom(int atomid)
{
  if ( atomid < 0 || atomid >= molecule->numAtoms ) return -1;  // failure
  modifyRequestedAtoms().add(atomid);
  return 0;  // success
}

int GlobalMasterFreeEnergy::getPosition(int atomid, Position &position)
{
  AtomIDList::const_iterator a_i = getAtomIdBegin();
  AtomIDList::const_iterator a_e = getAtomIdEnd();
  PositionList::const_iterator p_i = getAtomPositionBegin();
  for ( ; a_i != a_e; ++a_i, ++p_i ) {
    if ( *a_i == atomid ) {
      position = *p_i;
      return 0;  // success
    }
  }
  return -1;  // failure
}

int GlobalMasterFreeEnergy::addForce(int atomid, Force force)
{
  DebugM(2,"Forcing "<<atomid<<" with "<<force<<"\n");
  if ( atomid < 0 || atomid >= molecule->numAtoms ) return -1;  // failure
  modifyForcedAtoms().add(atomid);
  modifyAppliedForces().add(force);
  return 0;  // success
}


GlobalMasterFreeEnergy::GlobalMasterFreeEnergy() 
: GlobalMaster() {
  DebugM(3,"Constructing GlobalMasterFreeEnergy\n");
  molecule = Node::Object()->molecule;
  simParams = Node::Object()->simParameters;

  // now set up the free energy stuff
  initialize();
}

GlobalMasterFreeEnergy::~GlobalMasterFreeEnergy() {
  DebugM(3,"Destructing GlobalMasterFreeEnergy\n");
  delete config;
}


void GlobalMasterFreeEnergy::initialize() {
  DebugM(4,"Initializing master\n");

  // Get our script
  StringList *script = Node::Object()->configList->find("freeEnergyConfig");

  config = new char[1];
  config[0] = '\0';

  for ( ; script; script = script->next) {
    if ( strstr(script->data,"\n") ) {
      size_t add_len = strlen(script->data);
      size_t config_len = 0;
      config_len = strlen(config);
      char *new_config = new char[config_len + add_len + 2];
      strcpy(new_config,config);
      strcat(new_config,script->data);
      strcat(new_config,"\n");  // just to be safe
      delete [] config;
      config = new_config;
    } else {
      FILE *infile = fopen(script->data,"r");
      if ( ! infile ) {
        char errmsg[256];
        sprintf(errmsg,"Error trying to read file %s!\n",script->data);
        NAMD_die(errmsg);
      }
      fseek(infile,0,SEEK_END);
      size_t add_len = ftell(infile);
      size_t config_len = 0;
      config_len = strlen(config);
      char *new_config = new char[config_len + add_len + 3];
      strcpy(new_config,config);
      delete [] config;
      config = new_config;
      new_config += config_len;
      rewind(infile);
      fread(new_config,sizeof(char),add_len,infile);
      new_config += add_len;
      new_config[0] = '\n';
      new_config[1] = '\0';
      fclose(infile);
    }
  }

  // iout << iDEBUG << "Free energy perturbation - initialize()\n" << endi; 
  user_initialize();
}


void GlobalMasterFreeEnergy::calculate() {
  DebugM(4,"Calculating forces on master\n");
  
  /* zero out the forces */
  modifyForcedAtoms().resize(0);
  modifyAppliedForces().resize(0);

  /* XXX is this line needed at all? */
  modifyGroupForces().resize(getGroupMassEnd() - getGroupMassBegin());
  modifyGroupForces().setall(Vector(0,0,0));

//  iout << iDEBUG << "Free energy perturbation - calculate()\n" << endi; 
  user_calculate();

  // Send results to clients
  DebugM(3,"Sending results (" << forcedAtoms().size() << " forces) on master\n");
  if ( changedAtoms() || changedGroups() ) {
    DebugM(4,"Sending new configuration (" <<
                        requestedAtoms().size() << " atoms) on master\n");
  }
}

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