277 lines
10 KiB
C
277 lines
10 KiB
C
/*
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* =======================================================================================
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*
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* Authors: Jan Eitzinger (je), jan.eitzinger@fau.de
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* Rafael Ravedutti (rr), rafaelravedutti@gmail.com
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*
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* Copyright (c) 2021 RRZE, University Erlangen-Nuremberg
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*
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* This file is part of MD-Bench.
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*
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* MD-Bench is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* MD-Bench 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 FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser 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 Lesser General Public License along
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* with MD-Bench. If not, see <https://www.gnu.org/licenses/>.
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* =======================================================================================
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <atom.h>
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#include <allocate.h>
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#include <util.h>
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#define DELTA 20000
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#ifndef MAXLINE
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#define MAXLINE 4096
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#endif
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#ifndef MAX
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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void initAtom(Atom *atom)
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{
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atom->x = NULL; atom->y = NULL; atom->z = NULL;
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atom->vx = NULL; atom->vy = NULL; atom->vz = NULL;
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atom->fx = NULL; atom->fy = NULL; atom->fz = NULL;
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atom->Natoms = 0;
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atom->Nlocal = 0;
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atom->Nghost = 0;
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atom->Nmax = 0;
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atom->type = NULL;
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atom->ntypes = 0;
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atom->epsilon = NULL;
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atom->sigma6 = NULL;
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atom->cutforcesq = NULL;
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atom->cutneighsq = NULL;
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}
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void createAtom(Atom *atom, Parameter *param)
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{
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MD_FLOAT xlo = 0.0; MD_FLOAT xhi = param->xprd;
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MD_FLOAT ylo = 0.0; MD_FLOAT yhi = param->yprd;
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MD_FLOAT zlo = 0.0; MD_FLOAT zhi = param->zprd;
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atom->Natoms = 4 * param->nx * param->ny * param->nz;
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atom->Nlocal = 0;
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atom->ntypes = param->ntypes;
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atom->epsilon = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->sigma6 = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->cutforcesq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->cutneighsq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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for(int i = 0; i < atom->ntypes * atom->ntypes; i++) {
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atom->epsilon[i] = param->epsilon;
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atom->sigma6[i] = param->sigma6;
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atom->cutneighsq[i] = param->cutneigh * param->cutneigh;
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atom->cutforcesq[i] = param->cutforce * param->cutforce;
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}
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MD_FLOAT alat = pow((4.0 / param->rho), (1.0 / 3.0));
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int ilo = (int) (xlo / (0.5 * alat) - 1);
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int ihi = (int) (xhi / (0.5 * alat) + 1);
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int jlo = (int) (ylo / (0.5 * alat) - 1);
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int jhi = (int) (yhi / (0.5 * alat) + 1);
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int klo = (int) (zlo / (0.5 * alat) - 1);
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int khi = (int) (zhi / (0.5 * alat) + 1);
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ilo = MAX(ilo, 0);
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ihi = MIN(ihi, 2 * param->nx - 1);
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jlo = MAX(jlo, 0);
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jhi = MIN(jhi, 2 * param->ny - 1);
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klo = MAX(klo, 0);
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khi = MIN(khi, 2 * param->nz - 1);
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MD_FLOAT xtmp, ytmp, ztmp, vxtmp, vytmp, vztmp;
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int i, j, k, m, n;
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int sx = 0; int sy = 0; int sz = 0;
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int ox = 0; int oy = 0; int oz = 0;
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int subboxdim = 8;
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while(oz * subboxdim <= khi) {
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k = oz * subboxdim + sz;
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j = oy * subboxdim + sy;
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i = ox * subboxdim + sx;
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if(((i + j + k) % 2 == 0) &&
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(i >= ilo) && (i <= ihi) &&
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(j >= jlo) && (j <= jhi) &&
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(k >= klo) && (k <= khi)) {
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xtmp = 0.5 * alat * i;
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ytmp = 0.5 * alat * j;
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ztmp = 0.5 * alat * k;
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if( xtmp >= xlo && xtmp < xhi &&
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ytmp >= ylo && ytmp < yhi &&
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ztmp >= zlo && ztmp < zhi ) {
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n = k * (2 * param->ny) * (2 * param->nx) +
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j * (2 * param->nx) +
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i + 1;
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for(m = 0; m < 5; m++) {
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myrandom(&n);
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}
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vxtmp = myrandom(&n);
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for(m = 0; m < 5; m++){
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myrandom(&n);
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}
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vytmp = myrandom(&n);
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for(m = 0; m < 5; m++) {
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myrandom(&n);
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}
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vztmp = myrandom(&n);
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if(atom->Nlocal == atom->Nmax) {
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growAtom(atom);
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}
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atom_x(atom->Nlocal) = xtmp;
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atom_y(atom->Nlocal) = ytmp;
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atom_z(atom->Nlocal) = ztmp;
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atom->vx[atom->Nlocal] = vxtmp;
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atom->vy[atom->Nlocal] = vytmp;
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atom->vz[atom->Nlocal] = vztmp;
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atom->type[atom->Nlocal] = rand() % atom->ntypes;
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atom->Nlocal++;
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}
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}
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sx++;
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if(sx == subboxdim) { sx = 0; sy++; }
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if(sy == subboxdim) { sy = 0; sz++; }
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if(sz == subboxdim) { sz = 0; ox++; }
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if(ox * subboxdim > ihi) { ox = 0; oy++; }
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if(oy * subboxdim > jhi) { oy = 0; oz++; }
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}
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}
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int readAtom(Atom* atom, Parameter* param)
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{
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FILE *fp = fopen(param->input_file, "r");
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char line[MAXLINE];
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int natoms = 0;
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int read_atoms = 0;
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int atom_id = -1;
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int ts = -1;
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if(!fp) {
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fprintf(stderr, "Could not open input file: %s\n", param->input_file);
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exit(-1);
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return -1;
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}
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while(!feof(fp) && ts < 1 && !read_atoms) {
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fgets(line, MAXLINE, fp);
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if(strncmp(line, "ITEM: ", 6) == 0) {
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char *item = &line[6];
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if(strncmp(item, "TIMESTEP", 8) == 0) {
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fgets(line, MAXLINE, fp);
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ts = atoi(line);
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} else if(strncmp(item, "NUMBER OF ATOMS", 15) == 0) {
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fgets(line, MAXLINE, fp);
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natoms = atoi(line);
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atom->Natoms = natoms;
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atom->Nlocal = natoms;
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while(atom->Nlocal >= atom->Nmax) {
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growAtom(atom);
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}
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} else if(strncmp(item, "BOX BOUNDS pp pp pp", 19) == 0) {
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fgets(line, MAXLINE, fp);
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param->xlo = atof(strtok(line, " "));
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param->xhi = atof(strtok(NULL, " "));
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param->xprd = param->xhi - param->xlo;
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fgets(line, MAXLINE, fp);
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param->ylo = atof(strtok(line, " "));
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param->yhi = atof(strtok(NULL, " "));
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param->yprd = param->yhi - param->ylo;
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fgets(line, MAXLINE, fp);
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param->zlo = atof(strtok(line, " "));
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param->zhi = atof(strtok(NULL, " "));
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param->zprd = param->zhi - param->zlo;
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} else if(strncmp(item, "ATOMS id type x y z vx vy vz", 28) == 0) {
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for(int i = 0; i < natoms; i++) {
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fgets(line, MAXLINE, fp);
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atom_id = atoi(strtok(line, " ")) - 1;
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atom->type[atom_id] = atoi(strtok(NULL, " "));
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atom_x(atom_id) = atof(strtok(NULL, " "));
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atom_y(atom_id) = atof(strtok(NULL, " "));
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atom_z(atom_id) = atof(strtok(NULL, " "));
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atom->vx[atom_id] = atof(strtok(NULL, " "));
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atom->vy[atom_id] = atof(strtok(NULL, " "));
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atom->vz[atom_id] = atof(strtok(NULL, " "));
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atom->ntypes = MAX(atom->type[atom_id], atom->ntypes);
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read_atoms++;
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}
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} else {
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fprintf(stderr, "Invalid item: %s\n", item);
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exit(-1);
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return -1;
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}
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} else {
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fprintf(stderr, "Invalid input from file, expected item reference but got:\n%s\n", line);
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exit(-1);
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return -1;
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}
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}
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if(ts < 0 || !natoms || !read_atoms) {
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fprintf(stderr, "Input error: atom data was not read!\n");
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exit(-1);
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return -1;
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}
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atom->epsilon = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->sigma6 = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->cutforcesq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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atom->cutneighsq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
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for(int i = 0; i < atom->ntypes * atom->ntypes; i++) {
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atom->epsilon[i] = param->epsilon;
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atom->sigma6[i] = param->sigma6;
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atom->cutneighsq[i] = param->cutneigh * param->cutneigh;
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atom->cutforcesq[i] = param->cutforce * param->cutforce;
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}
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fprintf(stdout, "Read %d atoms from %s\n", natoms, param->input_file);
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return natoms;
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}
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void growAtom(Atom *atom)
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{
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int nold = atom->Nmax;
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atom->Nmax += DELTA;
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#ifdef AOS
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atom->x = (MD_FLOAT*) reallocate(atom->x, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT) * 3, nold * sizeof(MD_FLOAT) * 3);
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#else
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atom->x = (MD_FLOAT*) reallocate(atom->x, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->y = (MD_FLOAT*) reallocate(atom->y, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->z = (MD_FLOAT*) reallocate(atom->z, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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#endif
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atom->vx = (MD_FLOAT*) reallocate(atom->vx, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->vy = (MD_FLOAT*) reallocate(atom->vy, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->vz = (MD_FLOAT*) reallocate(atom->vz, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->fx = (MD_FLOAT*) reallocate(atom->fx, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->fy = (MD_FLOAT*) reallocate(atom->fy, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->fz = (MD_FLOAT*) reallocate(atom->fz, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
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atom->type = (int *) reallocate(atom->type, ALIGNMENT, atom->Nmax * sizeof(int), nold * sizeof(int));
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}
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