init_md.c

/*----------------------------------------------------------------------
  PuReMD - Purdue ReaxFF Molecular Dynamics Program

  Copyright (2010) Purdue University
  Hasan Metin Aktulga, haktulga@cs.purdue.edu
  Joseph Fogarty, jcfogart@mail.usf.edu
  Sagar Pandit, pandit@usf.edu
  Ananth Y Grama, ayg@cs.purdue.edu

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details:
  <http://www.gnu.org/licenses/>.
  ----------------------------------------------------------------------*/

#include "reax_types.h"

#ifdef HAVE_CUDA
  #include "dev_alloc.h"
  #include "dev_list.h"
  #include "cuda_copy.h"
  #include "cuda_forces.h"
  #include "cuda_init_md.h"
  #include "cuda_neighbors.h"
  #include "cuda_reset_tools.h"
  #include "validation.h"
#endif

#if defined(PURE_REAX)
  #include "init_md.h"
  #include "allocate.h"
  #include "box.h"
  #include "comm_tools.h"
  #include "forces.h"
  #include "grid.h"
  #include "integrate.h"
  #include "io_tools.h"
  #include "list.h"
  #include "lookup.h"
  #include "neighbors.h"
  #include "random.h"
  #include "reset_tools.h"
  #include "system_props.h"
  #include "tool_box.h"
  #include "vector.h"
#elif defined(LAMMPS_REAX)
  #include "reax_init_md.h"
  #include "reax_allocate.h"
  #include "reax_forces.h"
  #include "reax_io_tools.h"
  #include "reax_list.h"
  #include "reax_lookup.h"
  #include "reax_reset_tools.h"
  #include "reax_system_props.h"
  #include "reax_tool_box.h"
  #include "reax_vector.h"
#endif


#if defined(PURE_REAX)
/************************ initialize system ************************/
int Reposition_Atoms( reax_system *system, control_params *control,
                      simulation_data *data, mpi_datatypes *mpi_data,
                      char *msg )
{
    int   i;
    rvec  dx;

    /* reposition atoms */
    if ( control->reposition_atoms == 0 )  //fit atoms to periodic box
    {
        rvec_MakeZero( dx );
    }
    else if ( control->reposition_atoms == 1 )  //put center of mass to center
    {
        rvec_Scale( dx, 0.5, system->big_box.box_norms );
        rvec_ScaledAdd( dx, -1., data->xcm );
    }
    else if ( control->reposition_atoms == 2 )  //put center of mass to origin
    {
        rvec_Scale( dx, -1., data->xcm );
    }
    else
    {
        strcpy( msg, "reposition_atoms: invalid option" );
        return FAILURE;
    }

    for ( i = 0; i < system->n; ++i )
        // Inc_on_T3_Gen( system->my_atoms[i].x, dx, &(system->big_box) );
        rvec_Add( system->my_atoms[i].x, dx );

    return SUCCESS;
}



void Generate_Initial_Velocities( reax_system *system, real T )
{
    int i;
    real m, scale, norm;


    if ( T <= 0.1 )
    {
        for ( i = 0; i < system->n; i++ )
            rvec_MakeZero( system->my_atoms[i].v );
    }
    else
    {
        Randomize();

        for ( i = 0; i < system->n; i++ )
        {
            rvec_Random( system->my_atoms[i].v );

            norm = rvec_Norm_Sqr( system->my_atoms[i].v );
            m = system->reax_param.sbp[ system->my_atoms[i].type ].mass;
            scale = SQRT( m * norm / (3.0 * K_B * T) );

            rvec_Scale( system->my_atoms[i].v, 1. / scale, system->my_atoms[i].v );

            // fprintf( stderr, "v = %f %f %f\n",
            // system->my_atoms[i].v[0],
            // system->my_atoms[i].v[1],
            // system->my_atoms[i].v[2] );

            // fprintf( stderr, "scale = %f\n", scale );
            // fprintf( stderr, "v = %f %f %f\n",
            // system->my_atoms[i].v[0],
            // system->my_atoms[i].v[1],
            // system->my_atoms[i].v[2] );
        }
    }
}


int Init_System( reax_system *system, control_params *control,
                 simulation_data *data, storage *workspace,
                 mpi_datatypes *mpi_data, char *msg )
{
    int i;
    reax_atom *atom;
    int nrecv[MAX_NBRS];

    Setup_New_Grid( system, control, MPI_COMM_WORLD );
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d GRID:\n", system->my_rank );
    Print_Grid( &(system->my_grid), stderr );
#endif
    Bin_My_Atoms( system, &(workspace->realloc) );
    Reorder_My_Atoms( system, workspace );

    /* estimate N and total capacity */
    for ( i = 0; i < MAX_NBRS; ++i )
    {
        nrecv[i] = 0;
    }
    MPI_Barrier( MPI_COMM_WORLD );
    system->N = SendRecv( system, mpi_data, mpi_data->boundary_atom_type, nrecv,
            Estimate_Boundary_Atoms, Unpack_Estimate_Message, 1 );
    system->total_cap = MAX( (int)(system->N * SAFE_ZONE), MIN_CAP );
    Bin_Boundary_Atoms( system );

    /* estimate numH and Hcap */
    system->numH = 0;
    if ( control->hbond_cut > 0.0 )
    {
        for ( i = 0; i < system->n; ++i )
        {
            atom = &(system->my_atoms[i]);

            if ( system->reax_param.sbp[ atom->type ].p_hbond == 1 )
            {
                atom->Hindex = system->numH++;
            }
            else
            {
                atom->Hindex = -1;
            }
        }
    }
    //Tried fix
    //system->Hcap = MAX( system->numH * SAFER_ZONE, MIN_CAP );
    system->Hcap = MAX( system->n * SAFER_ZONE, MIN_CAP );
    
// Sudhir-style below
/*
    system->numH = 0;
    if ( control->hbond_cut > 0.0 )
        for ( i = 0; i < system->n; ++i )
        {
            atom = &(system->my_atoms[i]);
            if ( system->reax_param.sbp[ atom->type ].p_hbond == 1 )
                atom->Hindex = system->numH++;
            else atom->Hindex = -1;
        }
    system->Hcap = MAX( system->numH * SAFER_ZONE, MIN_CAP );
*/

//Sync_System (system);

    //Allocate_System( system, system->local_cap, system->total_cap, msg );
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: n=%d local_cap=%d\n",
             system->my_rank, system->n, system->local_cap );
    fprintf( stderr, "p%d: N=%d total_cap=%d\n",
             system->my_rank, system->N, system->total_cap );
    fprintf( stderr, "p%d: numH=%d H_cap=%d\n",
             system->my_rank, system->numH, system->Hcap );
#endif

    Compute_Total_Mass( system, data, mpi_data->comm_mesh3D );
    Compute_Center_of_Mass( system, data, mpi_data, mpi_data->comm_mesh3D );
    // if( Reposition_Atoms( system, control, data, mpi_data, msg ) == FAILURE )
    //   return FAILURE;

    /* initialize velocities so that desired init T can be attained */
    if ( !control->restart || (control->restart && control->random_vel) )
        Generate_Initial_Velocities( system, control->T_init );
    Compute_Kinetic_Energy( system, data, mpi_data->comm_mesh3D );

    return SUCCESS;
}


#ifdef HAVE_CUDA
int Cuda_Init_System( reax_system *system, control_params *control,
                      simulation_data *data, storage *workspace,
                      mpi_datatypes *mpi_data, char *msg )
{
    int i;
    reax_atom *atom;
    int nrecv[MAX_NBRS];

    Setup_New_Grid( system, control, MPI_COMM_WORLD );
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d GRID:\n", system->my_rank );
    Print_Grid( &(system->my_grid), stderr );
#endif
    Bin_My_Atoms( system, &(workspace->realloc) );
    Reorder_My_Atoms( system, workspace );

    /* estimate N and total capacity */
    for ( i = 0; i < MAX_NBRS; ++i ) nrecv[i] = 0;
    MPI_Barrier( MPI_COMM_WORLD );
    system->max_recved = 0;
    system->N = SendRecv( system, mpi_data, mpi_data->boundary_atom_type, nrecv,
                          Estimate_Boundary_Atoms, Unpack_Estimate_Message, 1 );
    system->total_cap = MAX( (int)(system->N * SAFE_ZONE), MIN_CAP );
    Bin_Boundary_Atoms( system );

//MPI_ABORT( MPI_COMM_WORLD, -1);
//sudhir


#if defined(__CUDA_DEBUG_LOG__)
    //fprintf (stderr, "After first SendRecv: N: %d, total_cap: %d \n",
    //                      system->N, system->total_cap);
#endif

    /* estimate numH and Hcap */
    system->numH = 0;
    if ( control->hbond_cut > 0.0 )
        //TODO
        //for( i = 0; i < system->n; ++i ) {
        for ( i = 0; i < system->N; ++i )
        {
            atom = &(system->my_atoms[i]);
            atom->Hindex = i;
            //FIX - 4 - Added fix for HBond Issue
            if ( system->reax_param.sbp[ atom->type ].p_hbond == 1 )
                system->numH++;
            //else atom->Hindex = -1;
        }
    system->Hcap = MAX( system->numH * SAFER_ZONE, MIN_CAP );
    
    //Allocate_System( system, system->local_cap, system->total_cap, msg );

    //Sync atoms here to continue the computation
    //fprintf (stderr, " N:%d after sendrecv \n");
    dev_alloc_system (system);
    Sync_System (system);

#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: n=%d local_cap=%d\n",
             system->my_rank, system->n, system->local_cap );
    fprintf( stderr, "p%d: N=%d total_cap=%d\n",
             system->my_rank, system->N, system->total_cap );
    fprintf( stderr, "p%d: numH=%d H_cap=%d\n",
             system->my_rank, system->numH, system->Hcap );
#endif

    Cuda_Compute_Total_Mass( system, data, mpi_data->comm_mesh3D );
    Cuda_Compute_Center_of_Mass( system, data, mpi_data, mpi_data->comm_mesh3D );
    // if( Reposition_Atoms( system, control, data, mpi_data, msg ) == FAILURE )
    //   return FAILURE;

    /* initialize velocities so that desired init T can be attained */
    if ( !control->restart || (control->restart && control->random_vel) )
        Generate_Initial_Velocities( system, control->T_init );

    Cuda_Compute_Kinetic_Energy( system, data, mpi_data->comm_mesh3D );

    return SUCCESS;
}
#endif


/************************ initialize simulation data ************************/
int Init_Simulation_Data( reax_system *system, control_params *control,
                          simulation_data *data, char *msg )
{
    Reset_Simulation_Data( data );

    if ( !control->restart )
        data->step = data->prev_steps = 0;

    switch ( control->ensemble )
    {
    case NVE:
        data->N_f = 3 * system->bigN;
        Evolve = Velocity_Verlet_NVE;
        control->virial = 0;
        break;

    case bNVT:
        data->N_f = 3 * system->bigN + 1;
        Evolve = Velocity_Verlet_Berendsen_NVT;
        control->virial = 0;
        break;

    case nhNVT:
        fprintf( stderr, "WARNING: Nose-Hoover NVT is still under testing.\n" );
        //return FAILURE;
        data->N_f = 3 * system->bigN + 1;
        Evolve = Velocity_Verlet_Nose_Hoover_NVT_Klein;
        control->virial = 0;
        if ( !control->restart || (control->restart && control->random_vel) )
        {
            data->therm.G_xi = control->Tau_T *
                               (2.0 * data->sys_en.e_kin - data->N_f * K_B * control->T );
            data->therm.v_xi = data->therm.G_xi * control->dt;
            data->therm.v_xi_old = 0;
            data->therm.xi = 0;
        }
        break;

    case sNPT: /* Semi-Isotropic NPT */
        data->N_f = 3 * system->bigN + 4;
        Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        if ( !control->restart )
            Reset_Pressures( data );
        break;

    case iNPT: /* Isotropic NPT */
        data->N_f = 3 * system->bigN + 2;
        Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        if ( !control->restart )
            Reset_Pressures( data );
        break;

    case NPT: /* Anisotropic NPT */
        strcpy( msg, "init_simulation_data: option not yet implemented" );
        return FAILURE;

        data->N_f = 3 * system->bigN + 9;
        Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        /*if( !control->restart ) {
          data->therm.G_xi = control->Tau_T *
          (2.0 * data->my_en.e_Kin - data->N_f * K_B * control->T );
          data->therm.v_xi = data->therm.G_xi * control->dt;
          data->iso_bar.eps = 0.33333 * log(system->box.volume);
          data->inv_W = 1.0 /
          ( data->N_f * K_B * control->T * SQR(control->Tau_P) );
          Compute_Pressure( system, control, data, out_control );
          }*/
        break;

    default:
        strcpy( msg, "init_simulation_data: ensemble not recognized" );
        return FAILURE;
    }

    /* initialize the timer(s) */
    MPI_Barrier( MPI_COMM_WORLD );  // wait for everyone to come here
    if ( system->my_rank == MASTER_NODE )
    {
        data->timing.start = Get_Time( );
#if defined(LOG_PERFORMANCE)
        Reset_Timing( &data->timing );
#endif
    }


#if defined(DEBUG)
    fprintf( stderr, "data->N_f: %8.3f\n", data->N_f );
#endif
    return SUCCESS;
}


#ifdef HAVE_CUDA
int Cuda_Init_Simulation_Data( reax_system *system, control_params *control,
                               simulation_data *data, char *msg )
{
    Reset_Simulation_Data( data );

    if ( !control->restart )
        data->step = data->prev_steps = 0;

    switch ( control->ensemble )
    {
    case NVE:
        data->N_f = 3 * system->bigN;
        Cuda_Evolve = Velocity_Verlet_NVE;
        control->virial = 0;
        break;

    case bNVT:
        data->N_f = 3 * system->bigN + 1;
        Cuda_Evolve = Cuda_Velocity_Verlet_Berendsen_NVT;
        control->virial = 0;
        break;

    case nhNVT:
        fprintf( stderr, "WARNING: Nose-Hoover NVT is still under testing.\n" );
        //return FAILURE;
        data->N_f = 3 * system->bigN + 1;
        Cuda_Evolve = Velocity_Verlet_Nose_Hoover_NVT_Klein;
        control->virial = 0;
        if ( !control->restart || (control->restart && control->random_vel) )
        {
            data->therm.G_xi = control->Tau_T *
                               (2.0 * data->sys_en.e_kin - data->N_f * K_B * control->T );
            data->therm.v_xi = data->therm.G_xi * control->dt;
            data->therm.v_xi_old = 0;
            data->therm.xi = 0;
        }
        break;

    case sNPT: /* Semi-Isotropic NPT */
        data->N_f = 3 * system->bigN + 4;
        Cuda_Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        if ( !control->restart )
            Reset_Pressures( data );
        break;

    case iNPT: /* Isotropic NPT */
        data->N_f = 3 * system->bigN + 2;
        Cuda_Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        if ( !control->restart )
            Reset_Pressures( data );
        break;

    case NPT: /* Anisotropic NPT */
        strcpy( msg, "init_simulation_data: option not yet implemented" );
        return FAILURE;

        data->N_f = 3 * system->bigN + 9;
        Cuda_Evolve = Velocity_Verlet_Berendsen_NPT;
        control->virial = 1;
        break;

    default:
        strcpy( msg, "init_simulation_data: ensemble not recognized" );
        return FAILURE;
    }

    /* initialize the timer(s) */
    MPI_Barrier( MPI_COMM_WORLD );  // wait for everyone to come here
    if ( system->my_rank == MASTER_NODE )
    {
        data->timing.start = Get_Time( );
#if defined(LOG_PERFORMANCE)
        Reset_Timing( &data->timing );
#endif
    }


#if defined(DEBUG)
    fprintf( stderr, "data->N_f: %8.3f\n", data->N_f );
#endif
    return SUCCESS;
}
#endif


#elif defined(LAMMPS_REAX)
int Init_System( reax_system *system, char *msg )
{
    system->big_box.V = 0;
    system->big_box.box_norms[0] = 0;
    system->big_box.box_norms[1] = 0;
    system->big_box.box_norms[2] = 0;

    system->local_cap = (int)(system->n * SAFE_ZONE);
    system->total_cap = (int)(system->N * SAFE_ZONE);
#if defined(DEBUG)
    fprintf( stderr, "p%d: local_cap=%d total_cap=%d\n",
             system->my_rank, system->local_cap, system->total_cap );
#endif

    Allocate_System( system, system->local_cap, system->total_cap, msg );

    return SUCCESS;
}


int Init_Simulation_Data( reax_system *system, control_params *control,
                          simulation_data *data, char *msg )
{
    Reset_Simulation_Data( data );
#if defined(LOG_PERFORMANCE)
    Reset_Timing( &data->timing );
#endif

    //if( !control->restart )
    data->step = data->prev_steps = 0;

    return SUCCESS;
}
#endif



/************************ initialize workspace ************************/
/* Initialize Taper params */
void Init_Taper( control_params *control,  storage *workspace )
{
    real d1, d7;
    real swa, swa2, swa3;
    real swb, swb2, swb3;

    swa = control->nonb_low;
    swb = control->nonb_cut;

    if ( fabs( swa ) > 0.01 )
        fprintf( stderr, "Warning: non-zero lower Taper-radius cutoff\n" );

    if ( swb < 0 )
    {
        fprintf( stderr, "Negative upper Taper-radius cutoff\n" );
        MPI_Abort( MPI_COMM_WORLD,  INVALID_INPUT );
    }
    else if ( swb < 5 )
        fprintf( stderr, "Warning: very low Taper-radius cutoff: %f\n", swb );

    d1 = swb - swa;
    d7 = POW( d1, 7.0 );
    swa2 = SQR( swa );
    swa3 = CUBE( swa );
    swb2 = SQR( swb );
    swb3 = CUBE( swb );

    workspace->Tap[7] =  20.0 / d7;
    workspace->Tap[6] = -70.0 * (swa + swb) / d7;
    workspace->Tap[5] =  84.0 * (swa2 + 3.0 * swa * swb + swb2) / d7;
    workspace->Tap[4] = -35.0 * (swa3 + 9.0 * swa2 * swb + 9.0 * swa * swb2 + swb3 ) / d7;
    workspace->Tap[3] = 140.0 * (swa3 * swb + 3.0 * swa2 * swb2 + swa * swb3 ) / d7;
    workspace->Tap[2] = -210.0 * (swa3 * swb2 + swa2 * swb3) / d7;
    workspace->Tap[1] = 140.0 * swa3 * swb3 / d7;
    workspace->Tap[0] = (-35.0 * swa3 * swb2 * swb2 + 21.0 * swa2 * swb3 * swb2 +
                         7.0 * swa * swb3 * swb3 + swb3 * swb3 * swb ) / d7;
}


int Init_Workspace( reax_system *system, control_params *control,
                    storage *workspace, char *msg )
{
    int ret;

    ret = Allocate_Workspace( system, control, workspace,
                              system->local_cap, system->total_cap, msg );
    if ( ret != SUCCESS )
        return ret;

    memset( &(workspace->realloc), 0, sizeof(reallocate_data) );
    Reset_Workspace( system, workspace );

    /* Initialize the Taper function */
    Init_Taper( control, workspace );

    return SUCCESS;
}


#ifdef HAVE_CUDA
int Cuda_Init_Workspace( reax_system *system, control_params *control,
                         storage *workspace, char *msg )
{
    int ret;

    ret = dev_alloc_workspace ( system, control, dev_workspace,
                                system->local_cap, system->total_cap, msg );
    if ( ret != SUCCESS )
        return ret;

    memset( &(workspace->realloc), 0, sizeof(reallocate_data) );
    Cuda_Reset_Workspace( system, workspace );

    /* Initialize the Taper function */
    Init_Taper( control, dev_workspace );

    return SUCCESS;
}
#endif


/************** setup communication data structures  **************/
int Init_MPI_Datatypes( reax_system *system, storage *workspace,
                        mpi_datatypes *mpi_data, char *msg )
{
    int           i, block[11];
    MPI_Aint      base, disp[11];
    MPI_Datatype  type[11];
    mpi_atom      sample;
    boundary_atom b_sample;
    restart_atom  r_sample;
    rvec          rvec_sample;
    rvec2         rvec2_sample;

    /* setup the world */
    mpi_data->world = MPI_COMM_WORLD;

    /* allocate mpi buffers  */
    //ret = Allocate_MPI_Buffers( mpi_data, system->est_recv,
    //              system->gcell_cap, system->my_nbrs, msg );
    //tmp = 0;
    //#if defined(DEBUG_FOCUS)
    //for( i = 0; i < MAX_NBRS; ++i )
    //if( i != MYSELF )
    //  tmp += system->my_nbrs[i].est_send;

    //fprintf( stderr, "p%d: allocated mpi_buffers: recv=%d send=%d total=%dMB\n",
    //   system->my_rank, system->est_recv, tmp,
    //   (int)((system->est_recv+tmp)*sizeof(boundary_atom)/(1024*1024)) );
    //#endif
    //if( ret != SUCCESS )
    //  return ret;

    /* mpi_atom - [orig_id, imprt_id, type, num_bonds, num_hbonds, name,
                   x, v, f_old, s, t] */
    block[0] = block[1] = block[2] = block[3] = block[4] = 1;
    block[5] = 8;
    block[6] = block[7] = block[8] = 3;
    block[9] = block[10] = 4;

    MPI_Address( &(sample.orig_id),    disp + 0 );
    MPI_Address( &(sample.imprt_id),   disp + 1 );
    MPI_Address( &(sample.type),       disp + 2 );
    MPI_Address( &(sample.num_bonds),  disp + 3 );
    MPI_Address( &(sample.num_hbonds), disp + 4 );
    MPI_Address( &(sample.name),       disp + 5 );
    MPI_Address( &(sample.x[0]),       disp + 6 );
    MPI_Address( &(sample.v[0]),       disp + 7 );
    MPI_Address( &(sample.f_old[0]),   disp + 8 );
    MPI_Address( &(sample.s[0]),       disp + 9 );
    MPI_Address( &(sample.t[0]),       disp + 10 );

    base = (MPI_Aint)(&(sample));
    for ( i = 0; i < 11; ++i ) disp[i] -= base;

    type[0] = type[1] = type[2] = type[3] = type[4] = MPI_INT;
    type[5] = MPI_CHAR;
    type[6] = type[7] = type[8] = type[9] = type[10] = MPI_DOUBLE;

    MPI_Type_struct( 11, block, disp, type, &(mpi_data->mpi_atom_type) );
    MPI_Type_commit( &(mpi_data->mpi_atom_type) );

    /* boundary_atom - [orig_id, imprt_id, type, num_bonds, num_hbonds, x] */
    block[0] = block[1] = block[2] = block[3] = block[4] = 1;
    block[5] = 3;

    MPI_Address( &(b_sample.orig_id),    disp + 0 );
    MPI_Address( &(b_sample.imprt_id),   disp + 1 );
    MPI_Address( &(b_sample.type),       disp + 2 );
    MPI_Address( &(b_sample.num_bonds),  disp + 3 );
    MPI_Address( &(b_sample.num_hbonds), disp + 4 );
    MPI_Address( &(b_sample.x[0]),       disp + 5 );

    base = (MPI_Aint)(&(b_sample));
    for ( i = 0; i < 6; ++i ) disp[i] -= base;

    type[0] = type[1] = type[2] = type[3] = type[4] = MPI_INT;
    type[5] = MPI_DOUBLE;

    MPI_Type_struct( 6, block, disp, type, &(mpi_data->boundary_atom_type) );
    MPI_Type_commit( &(mpi_data->boundary_atom_type) );

    /* mpi_rvec */
    block[0] = 3;
    MPI_Address( &(rvec_sample[0]), disp + 0 );
    base = disp[0];
    for ( i = 0; i < 1; ++i ) disp[i] -= base;
    type[0] = MPI_DOUBLE;
    MPI_Type_struct( 1, block, disp, type, &(mpi_data->mpi_rvec) );
    MPI_Type_commit( &(mpi_data->mpi_rvec) );

    /* mpi_rvec2 */
    block[0] = 2;
    MPI_Address( &(rvec2_sample[0]), disp + 0 );
    base = disp[0];
    for ( i = 0; i < 1; ++i ) disp[i] -= base;
    type[0] = MPI_DOUBLE;
    MPI_Type_struct( 1, block, disp, type, &(mpi_data->mpi_rvec2) );
    MPI_Type_commit( &(mpi_data->mpi_rvec2) );

    /* restart_atom - [orig_id, type, name[8], x, v] */
    block[0] = block[1] = 1 ;
    block[2] = 8;
    block[3] = block[4] = 3;

    MPI_Address( &(r_sample.orig_id),    disp + 0 );
    MPI_Address( &(r_sample.type),       disp + 1 );
    MPI_Address( &(r_sample.name),       disp + 2 );
    MPI_Address( &(r_sample.x[0]),       disp + 3 );
    MPI_Address( &(r_sample.v[0]),       disp + 4 );

    base = (MPI_Aint)(&(r_sample));
    for ( i = 0; i < 5; ++i ) disp[i] -= base;

    type[0] = type[1] = MPI_INT;
    type[2] = MPI_CHAR;
    type[3] = type[4] = MPI_DOUBLE;

    MPI_Type_struct( 5, block, disp, type, &(mpi_data->restart_atom_type) );
    MPI_Type_commit( &(mpi_data->restart_atom_type) );

    return SUCCESS;
}


/********************** allocate lists *************************/
int  Init_Lists( reax_system *system, control_params *control,
                 simulation_data *data, storage *workspace, reax_list **lists,
                 mpi_datatypes *mpi_data, char *msg )
{
    int i, num_nbrs;
    int total_hbonds, total_bonds, bond_cap, num_3body, cap_3body, Htop;
    int *hb_top, *bond_top;
    int nrecv[MAX_NBRS];

    //for( i = 0; i < MAX_NBRS; ++i ) nrecv[i] = system->my_nbrs[i].est_recv;
    //system->N = SendRecv( system, mpi_data, mpi_data->boundary_atom_type, nrecv,
    //        Sort_Boundary_Atoms, Unpack_Exchange_Message, 1 );

    num_nbrs = Estimate_NumNeighbors( system, lists );
    if (!Make_List(system->total_cap, num_nbrs, TYP_FAR_NEIGHBOR, *lists + FAR_NBRS))
    {
        fprintf(stderr, "Problem in initializing far nbrs list. Terminating!\n");
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: allocated far_nbrs: num_far=%d, space=%dMB\n",
             system->my_rank, num_nbrs,
             (int)(num_nbrs * sizeof(far_neighbor_data) / (1024 * 1024)) );
#endif

    Generate_Neighbor_Lists( system, data, workspace, lists );
    bond_top = (int*) calloc( system->total_cap, sizeof(int) );
    hb_top = (int*) calloc( system->local_cap, sizeof(int) );
    //hb_top = (int*) calloc( system->Hcap, sizeof(int) );
    
    
    Estimate_Storages( system, control, lists,
                       &Htop, hb_top, bond_top, &num_3body );
  //Host_Estimate_Sparse_Matrix( system, control, lists, system->local_cap, system->total_cap,
      //                      &Htop, hb_top, bond_top, &num_3body );
    
  
    
    Allocate_Matrix( &(workspace->H), system->local_cap, Htop );
    
    //MATRIX CHANGES
    //workspace->L = NULL;
    //workspace->U = NULL;
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: allocated H matrix: Htop=%d, space=%dMB\n",
             system->my_rank, Htop,
             (int)(Htop * sizeof(sparse_matrix_entry) / (1024 * 1024)) );
#endif

    if ( control->hbond_cut > 0.0 )
    {
        // init H indexes
        total_hbonds = 0;
        for ( i = 0; i < system->n; ++i )
        {
            system->my_atoms[i].num_hbonds = hb_top[i];
            total_hbonds += hb_top[i];
        }
        total_hbonds = MAX( total_hbonds * SAFER_ZONE, MIN_CAP * MIN_HBONDS );

       // DANIEL, to make Mpi_Not_Gpu_Validate_Lists() not complain that system->max_bonds is 0
       system->max_hbonds = total_hbonds * SAFER_ZONE;


        if ( !Make_List( system->Hcap, total_hbonds, TYP_HBOND, *lists + HBONDS) )
        {
            fprintf( stderr, "not enough space for hbonds list. terminating!\n" );
            MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
        }
#if defined(DEBUG_FOCUS)
        fprintf( stderr, "p%d: allocated hbonds: total_hbonds=%d, space=%dMB\n",
                 system->my_rank, total_hbonds,
                 (int)(total_hbonds * sizeof(hbond_data) / (1024 * 1024)) );
#endif
    }

    /* bonds list */
    //Allocate_Bond_List( system->N, bond_top, (*lists)+BONDS );
    //num_bonds = bond_top[system->N-1];
    total_bonds = 0;
    for ( i = 0; i < system->N; ++i )
    {
        system->my_atoms[i].num_bonds = bond_top[i];
        total_bonds += bond_top[i];
    }
    bond_cap = MAX( total_bonds * SAFE_ZONE, MIN_CAP * MIN_BONDS );
 

    // DANIEL, to make Mpi_Not_Gpu_Validate_Lists() not complain that system->max_bonds is 0
    system->max_bonds = total_bonds * SAFER_ZONE;

    if ( !Make_List( system->total_cap, bond_cap, TYP_BOND, *lists + BONDS) )
    {
        fprintf( stderr, "not enough space for bonds list. terminating!\n" );
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: allocated bonds: total_bonds=%d, space=%dMB\n",
             system->my_rank, bond_cap,
             (int)(bond_cap * sizeof(bond_data) / (1024 * 1024)) );
#endif

    /* 3bodies list */
    cap_3body = MAX( num_3body * SAFE_ZONE, MIN_3BODIES );
    if ( !Make_List(bond_cap, cap_3body, TYP_THREE_BODY, *lists + THREE_BODIES) )
    {
        fprintf( stderr, "Problem in initializing angles list. Terminating!\n" );
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: allocated 3-body list: num_3body=%d, space=%dMB\n",
             system->my_rank, cap_3body,
             (int)(cap_3body * sizeof(three_body_interaction_data) / (1024 * 1024)) );
#endif

#if defined(TEST_FORCES)
    if (!Make_List(system->total_cap, bond_cap * 8, TYP_DDELTA, (*lists) + DDELTAS))
    {
        fprintf( stderr, "Problem in initializing dDelta list. Terminating!\n" );
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
    fprintf( stderr, "p%d: allocated dDelta list: num_ddelta=%d space=%ldMB\n",
             system->my_rank, bond_cap * 30,
             bond_cap * 8 * sizeof(dDelta_data) / (1024 * 1024) );

    if ( !Make_List( bond_cap, bond_cap * 50, TYP_DBO, (*lists) + DBOS) )
    {
        fprintf( stderr, "Problem in initializing dBO list. Terminating!\n" );
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
    fprintf( stderr, "p%d: allocated dbond list: num_dbonds=%d space=%ldMB\n",
             system->my_rank, bond_cap * MAX_BONDS * 3,
             bond_cap * MAX_BONDS * 3 * sizeof(dbond_data) / (1024 * 1024) );
#endif

    free( hb_top );
    free( bond_top );

    return SUCCESS;
}


#ifdef HAVE_CUDA
int  Cuda_Init_Lists( reax_system *system, control_params *control,
                      simulation_data *data, storage *workspace, reax_list **lists,
                      mpi_datatypes *mpi_data, char *msg )
{
    int i, num_nbrs;
    int total_hbonds, total_bonds, bond_cap, num_3body, cap_3body, Htop;
    int *hb_top, *bond_top;
    int nrecv[MAX_NBRS];
    int *nbr_indices = (int *) host_scratch;

    //num_nbrs = Estimate_NumNeighbors( system, lists );
    Cuda_Estimate_Neighbors( system, nbr_indices );
    num_nbrs = 0;
    //for (i = 0; i < 20; i++)
    //fprintf (stderr, "atom: %d -- %d \n", i, nbr_indices[i]);

    for (i = 0; i < system->N; i++)
    {
        num_nbrs += nbr_indices[i];
    }

    //fprintf (stderr, "DEVICE Total Neighbors: %d (%d)\n", num_nbrs, (int)(num_nbrs*SAFE_ZONE));

    for (i = 0; i < system->N; i++)
    {
        nbr_indices[i] = MAX( nbr_indices[i] * SAFER_ZONE, MIN_NBRS );
    }

    num_nbrs = 0;
    num_nbrs += nbr_indices[0];
    for (i = 1; i < system->N; i++)
    {
        num_nbrs += nbr_indices[i];
        nbr_indices[i] += nbr_indices[i - 1];
    }

    //fprintf (stderr, "DEVICE total neighbors entries: %d \n", nbr_indices [system->N - 1] );

    if (!Dev_Make_List(system->total_cap, num_nbrs, TYP_FAR_NEIGHBOR, *dev_lists + FAR_NBRS))
    {
        fprintf(stderr, "Problem in initializing far nbrs list. Terminating!\n");
        MPI_Abort( MPI_COMM_WORLD, INSUFFICIENT_MEMORY );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "p%d: allocated far_nbrs: num_far=%d, space=%dMB\n",
             system->my_rank, num_nbrs,
             (int)(num_nbrs * sizeof(far_neighbor_data) / (1024 * 1024)) );
#endif

    //fprintf (stderr, "N: %d and total_cap: %d \n", system->N, system->total_cap);
    Cuda_Init_Neighbors_Indices (nbr_indices, system->N);

    Cuda_Generate_Neighbor_Lists( system, data, workspace, lists );

    bond_top = (int*) calloc( system->total_cap, sizeof(int) );
    //hb_top = (int*) calloc( system->local_cap, sizeof(int) );
    hb_top = (int*) calloc( system->total_cap, sizeof(int) );
    Cuda_Estimate_Storages( system, control, lists, system->local_cap, system->total_cap,
                            &Htop, hb_top, bond_top, &num_3body );

    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX

    Cuda_Estimate_Sparse_Matrix (system, control, data, lists);
    //dev_alloc_matrix ( &(dev_workspace->H), system->local_cap, system->n * system->max_sparse_entries);
    //dev_alloc_matrix ( &(dev_workspace->H), system->total_cap, system->N * system->max_sparse_entries);
    dev_alloc_matrix ( &(dev_workspace->H), system->total_cap, system->total_cap * system->max_sparse_entries);
    dev_workspace->H.n = system->n;
    //THIS IS INITIALIZED in the init_forces function to system->n
    //but this is never used in the code.
    //GPU maintains the H matrix to be (NXN) symmetric matrix.

    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX
    //TODO - CARVER FIX

    //MATRIX CHANGES
    //workspace->L = NULL;
    //workspace->U = NULL;

#if defined(DEBUG_FOCUS)
    fprintf (stderr, "p:%d - allocated H matrix: max_entries: %d, cap: %d \n",
             system->my_rank, system->max_sparse_entries, dev_workspace->H.m);
    fprintf( stderr, "p%d: allocated H matrix: Htop=%d, space=%dMB\n",
             system->my_rank, Htop,
             (int)(Htop * sizeof(sparse_matrix_entry) / (1024 * 1024)) );
#endif

    // FIX - 4 - Added addition check here for hydrogen Bonds
    if (( control->hbond_cut > 0.0 ) && ( system->numH > 0 ))
    {
        /* init H indexes */
        total_hbonds = 0;
        int count = 0;
        //TODO
        //for( i = 0; i < system->n; ++i ) {
        for ( i = 0; i < system->N; ++i )
        {
            //system->my_atoms[i].num_hbonds = hb_top[i];
            //TODO
            hb_top [i] = MAX( hb_top[i] * 4, MIN_HBONDS * 4);
            total_hbonds += hb_top[i];
            if (hb_top [i] > 0)
            {
                ++count;
            }