int run_dgcuda(int argc, char *argv[]) {
int local_num_elem, local_num_sides;
int n_threads, n_blocks_elem, n_blocks_sides;
int i, n, local_n_p, total_timesteps, local_n_quad, local_n_quad1d;
int verbose, convergence, video, eval_error, benchmark;
double endtime, t;
double tol, total_error, max_error;
double *min_radius;
double min_r;
double *V1x, *V1y, *V2x, *V2y, *V3x, *V3y;
double *sides_x1, *sides_x2;
double *sides_y1, *sides_y2;
double *r1_local, *r2_local, *w_local;
double *s_r, *oned_w_local;
int *left_elem, *right_elem;
int *elem_s1, *elem_s2, *elem_s3;
int *left_side_number, *right_side_number;
FILE *mesh_file, *out_file;
char out_filename[100];
char *mesh_filename;
double *Uv1, *Uv2, *Uv3;
double *error;
clock_t start, end;
double elapsed;
// get input
endtime = -1;
if (get_input(argc, argv, &n, &total_timesteps, &endtime,
&verbose, &video, &convergence, &tol,
&benchmark, &eval_error,
&mesh_filename)) {
return 1;
}
// set the order of the approximation & timestep
local_n_p = (n + 1) * (n + 2) / 2;
// sanity check on limiter
if (limiter && n != 1) {
printf("Error: limiter only enabled for p = 1\n");
exit(0);
}
// open the mesh to get local_num_elem for allocations
mesh_file = fopen(mesh_filename, "r");
if (!mesh_file) {
printf("\nERROR: mesh file not found.\n");
return 1;
}
// read in the mesh and make all the mappings
read_mesh(mesh_file, &local_num_sides, &local_num_elem,
&V1x, &V1y, &V2x, &V2y, &V3x, &V3y,
&left_side_number, &right_side_number,
&sides_x1, &sides_y1,
&sides_x2, &sides_y2,
&elem_s1, &elem_s2, &elem_s3,
&left_elem, &right_elem);
// close the file
fclose(mesh_file);
// initialize the gpu
init_cpu(local_num_elem, local_num_sides, local_n_p,
V1x, V1y, V2x, V2y, V3x, V3y,
left_side_number, right_side_number,
sides_x1, sides_y1,
sides_x2, sides_y2,
elem_s1, elem_s2, elem_s3,
left_elem, right_elem,
convergence, eval_error);
// get the correct quadrature rules for this scheme
set_quadrature(n, &r1_local, &r2_local, &w_local,
&s_r, &oned_w_local, &local_n_quad, &local_n_quad1d);
// set constant data
set_N(local_N);
set_n_p(local_n_p);
set_num_elem(local_num_elem);
set_num_sides(local_num_sides);
set_n_quad(local_n_quad);
set_n_quad1d(local_n_quad1d);
// find the min inscribed circle
preval_inscribed_circles(d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y);
min_radius = (double *) malloc(local_num_elem * sizeof(double));
memcpy(min_radius, d_J, local_num_elem * sizeof(double));
min_r = min_radius[0];
for (i = 1; i < local_num_elem; i++) {
min_r = (min_radius[i] < min_r) ? min_radius[i] : min_r;
// report problem
if (min_radius[i] == 0) {
printf("%i\n", i);
printf("%.015lf, %.015lf, %.015lf, %.015lf, %.015lf, %.015lf\n",
V1x[i], V1y[i],
V2x[i], V2y[i],
V3x[i], V3y[i]);
}
}
free(min_radius);
// pre computations
preval_jacobian(d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y);
preval_side_length(d_s_length, d_s_V1x, d_s_V1y, d_s_V2x, d_s_V2y);
preval_normals(d_Nx, d_Ny,
d_s_V1x, d_s_V1y, d_s_V2x, d_s_V2y,
d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_left_side_number);
preval_normals_direction(d_Nx, d_Ny,
d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_left_elem, d_left_side_number);
preval_partials(d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_xr, d_yr,
d_xs, d_ys);
// evaluate the basis functions at those points and store on GPU
preval_basis(r1_local, r2_local, s_r, w_local, oned_w_local, local_n_quad, local_n_quad1d, local_n_p);
// no longer need any of these CPU variables
free(elem_s1);
free(elem_s2);
free(elem_s3);
free(sides_x1);
free(sides_x2);
free(sides_y1);
free(sides_y2);
free(left_elem);
free(right_elem);
free(left_side_number);
free(right_side_number);
free(r1_local);
free(r2_local);
free(w_local);
free(s_r);
free(oned_w_local);
// initial conditions
init_conditions(d_c, d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y);
printf(" ? %i degree polynomial interpolation (local_n_p = %i)\n", n, local_n_p);
printf(" ? %i precomputed basis points\n", local_n_quad * local_n_p);
printf(" ? %i elements\n", local_num_elem);
printf(" ? %i sides\n", local_num_sides);
printf(" ? min radius = %.015lf\n", min_r);
if (endtime == -1 && convergence != 1) {
printf(" ? total_timesteps = %i\n", total_timesteps);
} else if (endtime != -1 && convergence != 1) {
printf(" ? endtime = %lf\n", endtime);
}
if (benchmark) {
start = clock();
}
t = time_integrate_rk4(local_num_elem, local_num_sides,
n, local_n_p,
endtime, total_timesteps, min_r,
verbose, convergence, video, tol);
if (benchmark) {
end = clock();
elapsed = ((double)(end - start)) / CLOCKS_PER_SEC;
printf("Runtime: %lf seconds\n", elapsed);
}
// evaluate and write U to file
write_U(local_num_elem, total_timesteps, total_timesteps);
// free everything else
free(d_s_V1x);
free(d_s_V2x);
free(d_s_V1y);
free(d_s_V2y);
free(d_s_length);
free(d_lambda);
free(d_k1);
free(d_k2);
free(d_k3);
free(d_k4);
free(d_rhs_volume);
free(d_rhs_surface_left);
free(d_rhs_surface_right);
free(d_elem_s1);
free(d_elem_s2);
free(d_elem_s3);
free(d_xr);
free(d_yr);
free(d_xs);
free(d_ys);
free(d_left_side_number);
free(d_right_side_number);
free(d_Nx);
free(d_Ny);
free(d_right_elem);
free(d_left_elem);
free(d_c);
free(d_J);
free(d_Uv1);
free(d_Uv2);
free(d_Uv3);
free(d_V1x);
free(d_V1y);
free(d_V2x);
free(d_V2y);
free(d_V3x);
free(d_V3y);
// free CPU variables
free(V1x);
free(V1y);
free(V2x);
free(V2y);
free(V3x);
free(V3y);
return 0;
}
int main(int argc, char *argv[]) {
int num_elem, num_sides;
int n_threads, n_blocks_elem, n_blocks_reduction, n_blocks_sides;
int i, n, n_p, timesteps, n_quad, n_quad1d;
double dt, t, endtime;
double *min_radius;
double min_r;
double *V1x, *V1y, *V2x, *V2y, *V3x, *V3y;
double *sides_x1, *sides_x2;
double *sides_y1, *sides_y2;
double *r1_local, *r2_local, *w_local;
double *s_r, *oned_w_local;
int *left_elem, *right_elem;
int *elem_s1, *elem_s2, *elem_s3;
int *left_side_number, *right_side_number;
FILE *mesh_file, *out_file;
char line[100];
char *mesh_filename;
char *out_filename;
char *rho_out_filename;
char *u_out_filename;
char *v_out_filename;
char *E_out_filename;
char *outfile_base;
int outfile_len;
double *Uu1, *Uu2, *Uu3;
double *Uv1, *Uv2, *Uv3;
// get input
endtime = -1;
if (get_input(argc, argv, &n, ×teps, &endtime, &mesh_filename, &out_filename)) {
return 1;
}
// TODO: this should be cleaner, obviously
rho_out_filename = "output/uniform_rho.out";
u_out_filename = "output/uniform_u.out";
v_out_filename = "output/uniform_v.out";
E_out_filename = "output/uniform_E.out";
// set the order of the approximation & timestep
n_p = (n + 1) * (n + 2) / 2;
// open the mesh to get num_elem for allocations
mesh_file = fopen(mesh_filename, "r");
if (!mesh_file) {
printf("\nERROR: mesh file not found.\n");
return 1;
}
fgets(line, 100, mesh_file);
sscanf(line, "%i", &num_elem);
// allocate vertex points
V1x = (double *) malloc(num_elem * sizeof(double));
V1y = (double *) malloc(num_elem * sizeof(double));
V2x = (double *) malloc(num_elem * sizeof(double));
V2y = (double *) malloc(num_elem * sizeof(double));
V3x = (double *) malloc(num_elem * sizeof(double));
V3y = (double *) malloc(num_elem * sizeof(double));
elem_s1 = (int *) malloc(num_elem * sizeof(int));
elem_s2 = (int *) malloc(num_elem * sizeof(int));
elem_s3 = (int *) malloc(num_elem * sizeof(int));
// TODO: these are too big; should be a way to figure out how many we actually need
left_side_number = (int *) malloc(3*num_elem * sizeof(int));
right_side_number = (int *) malloc(3*num_elem * sizeof(int));
sides_x1 = (double *) malloc(3*num_elem * sizeof(double));
sides_x2 = (double *) malloc(3*num_elem * sizeof(double));
sides_y1 = (double *) malloc(3*num_elem * sizeof(double));
sides_y2 = (double *) malloc(3*num_elem * sizeof(double));
left_elem = (int *) malloc(3*num_elem * sizeof(int));
right_elem = (int *) malloc(3*num_elem * sizeof(int));
for (i = 0; i < 3*num_elem; i++) {
right_elem[i] = -1;
}
// read in the mesh and make all the mappings
read_mesh(mesh_file, &num_sides, num_elem,
V1x, V1y, V2x, V2y, V3x, V3y,
left_side_number, right_side_number,
sides_x1, sides_y1,
sides_x2, sides_y2,
elem_s1, elem_s2, elem_s3,
left_elem, right_elem);
// close the file
fclose(mesh_file);
// initialize the gpu
init_gpu(num_elem, num_sides, n_p,
V1x, V1y, V2x, V2y, V3x, V3y,
left_side_number, right_side_number,
sides_x1, sides_y1,
sides_x2, sides_y2,
elem_s1, elem_s2, elem_s3,
left_elem, right_elem);
n_threads = 256;
n_blocks_elem = (num_elem / n_threads) + ((num_elem % n_threads) ? 1 : 0);
n_blocks_sides = (num_sides / n_threads) + ((num_sides % n_threads) ? 1 : 0);
n_blocks_reduction = (num_elem / 256) + ((num_elem % 256) ? 1 : 0);
// find the min inscribed circle
preval_inscribed_circles(d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y, num_elem);
min_radius = (double *) malloc(num_elem * sizeof(double));
/*
// find the min inscribed circle. do it on the gpu if there are at least 256 elements
if (num_elem >= 256) {
//min_reduction<<<n_blocks_reduction, 256>>>(d_J, d_reduction, num_elem);
cudaThreadSynchronize();
checkCudaError("error after min_jacobian.");
// each block finds the smallest value, so need to sort through n_blocks_reduction
min_radius = (double *) malloc(n_blocks_reduction * sizeof(double));
cudaMemcpy(min_radius, d_reduction, n_blocks_reduction * sizeof(double), cudaMemcpyDeviceToHost);
min_r = min_radius[0];
for (i = 1; i < n_blocks_reduction; i++) {
min_r = (min_radius[i] < min_r) ? min_radius[i] : min_r;
}
free(min_radius);
} else {
*/
// just grab all the radii and sort them since there are so few of them
min_radius = (double *) malloc(num_elem * sizeof(double));
memcpy(min_radius, d_J, num_elem * sizeof(double));
min_r = min_radius[0];
for (i = 1; i < num_elem; i++) {
min_r = (min_radius[i] < min_r) ? min_radius[i] : min_r;
}
free(min_radius);
//}
// pre computations
preval_jacobian(d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y, num_elem);
preval_side_length(d_s_length, d_s_V1x, d_s_V1y, d_s_V2x, d_s_V2y,
num_sides);
//cudaThreadSynchronize();
preval_normals(d_Nx, d_Ny,
d_s_V1x, d_s_V1y, d_s_V2x, d_s_V2y,
d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_left_side_number, num_sides);
preval_normals_direction(d_Nx, d_Ny,
d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_left_elem, d_left_side_number, num_sides);
preval_partials(d_V1x, d_V1y,
d_V2x, d_V2y,
d_V3x, d_V3y,
d_xr, d_yr,
d_xs, d_ys, num_elem);
// get the correct quadrature rules for this scheme
set_quadrature(n, &r1_local, &r2_local, &w_local,
&s_r, &oned_w_local, &n_quad, &n_quad1d);
// evaluate the basis functions at those points and store on GPU
preval_basis(r1_local, r2_local, s_r, w_local, oned_w_local, n_quad, n_quad1d, n_p);
// initial conditions
init_conditions(d_c, d_J, d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y,
n_quad, n_p, num_elem);
printf("Computing...\n");
printf(" ? %i degree polynomial interpolation (n_p = %i)\n", n, n_p);
printf(" ? %i precomputed basis points\n", n_quad * n_p);
printf(" ? %i elements\n", num_elem);
printf(" ? %i sides\n", num_sides);
printf(" ? min radius = %lf\n", min_r);
printf(" ? endtime = %lf\n", endtime);
time_integrate_rk4(n_quad, n_quad1d, n_p, n, num_elem, num_sides, endtime, min_r);
// evaluate at the vertex points and copy over data
Uu1 = (double *) malloc(num_elem * sizeof(double));
Uu2 = (double *) malloc(num_elem * sizeof(double));
Uu3 = (double *) malloc(num_elem * sizeof(double));
Uv1 = (double *) malloc(num_elem * sizeof(double));
Uv2 = (double *) malloc(num_elem * sizeof(double));
Uv3 = (double *) malloc(num_elem * sizeof(double));
// evaluate rho and write to file
eval_u(d_c, d_Uv1, d_Uv2, d_Uv3, num_elem, n_p, 0);
memcpy(Uv1, d_Uv1, num_elem * sizeof(double));
memcpy(Uv2, d_Uv2, num_elem * sizeof(double));
memcpy(Uv3, d_Uv3, num_elem * sizeof(double));
out_file = fopen(rho_out_filename , "w");
fprintf(out_file, "View \"Density \" {\n");
for (i = 0; i < num_elem; i++) {
fprintf(out_file, "ST (%lf,%lf,0,%lf,%lf,0,%lf,%lf,0) {%lf,%lf,%lf};\n",
V1x[i], V1y[i], V2x[i], V2y[i], V3x[i], V3y[i],
d_Uv1[i], d_Uv2[i], d_Uv3[i]);
}
fprintf(out_file,"};");
fclose(out_file);
// evaluate the u and v vectors and write to file
eval_u_velocity(d_c, d_Uv1, d_Uv2, d_Uv3, num_elem, n_p, 1);
memcpy(Uu1, d_Uv1, num_elem * sizeof(double));
memcpy(Uu2, d_Uv2, num_elem * sizeof(double));
memcpy(Uu3, d_Uv3, num_elem * sizeof(double));
eval_u_velocity(d_c, d_Uv1, d_Uv2, d_Uv3, num_elem, n_p, 2);
memcpy(Uv1, d_Uv1, num_elem * sizeof(double));
memcpy(Uv2, d_Uv2, num_elem * sizeof(double));
memcpy(Uv3, d_Uv3, num_elem * sizeof(double));
out_file = fopen(u_out_filename , "w");
fprintf(out_file, "View \"u \" {\n");
for (i = 0; i < num_elem; i++) {
fprintf(out_file, "VT (%lf,%lf,0,%lf,%lf,0,%lf,%lf,0) {%lf,%lf,0,%lf,%lf,0,%lf,%lf,0};\n",
V1x[i], V1y[i], V2x[i], V2y[i], V3x[i], V3y[i],
Uu1[i], Uv1[i], Uu2[i], Uv2[i], Uu3[i], Uv3[i]);
}
fprintf(out_file,"};");
fclose(out_file);
// evaluate E and write to file
eval_u(d_c, d_Uv1, d_Uv2, d_Uv3, num_elem, n_p, 3);
memcpy(Uv1, d_Uv1, num_elem * sizeof(double));
memcpy(Uv2, d_Uv2, num_elem * sizeof(double));
memcpy(Uv3, d_Uv3, num_elem * sizeof(double));
out_file = fopen(E_out_filename , "w");
fprintf(out_file, "View \"E \" {\n");
for (i = 0; i < num_elem; i++) {
fprintf(out_file, "ST (%lf,%lf,0,%lf,%lf,0,%lf,%lf,0) {%lf,%lf,%lf};\n",
V1x[i], V1y[i], V2x[i], V2y[i], V3x[i], V3y[i],
Uv1[i], Uv2[i], Uv3[i]);
}
fprintf(out_file,"};");
fclose(out_file);
// plot pressure
eval_p(d_c, d_Uv1, d_Uv2, d_Uv3, num_elem, n_p, 3);
memcpy(Uv1, d_Uv1, num_elem * sizeof(double));
memcpy(Uv2, d_Uv2, num_elem * sizeof(double));
memcpy(Uv3, d_Uv3, num_elem * sizeof(double));
out_file = fopen("output/p.out" , "w");
fprintf(out_file, "View \"E \" {\n");
for (i = 0; i < num_elem; i++) {
fprintf(out_file, "ST (%lf,%lf,0,%lf,%lf,0,%lf,%lf,0) {%lf,%lf,%lf};\n",
V1x[i], V1y[i], V2x[i], V2y[i], V3x[i], V3y[i],
Uv1[i], Uv2[i], Uv3[i]);
}
fprintf(out_file,"};");
fclose(out_file);
measure_error(d_c, d_Uv1, d_Uv2, d_Uv3,
d_V1x, d_V1y, d_V2x, d_V2y, d_V3x, d_V3y,
num_elem, n_p);
memcpy(Uv1, d_Uv1, num_elem * sizeof(double));
memcpy(Uv2, d_Uv2, num_elem * sizeof(double));
memcpy(Uv3, d_Uv3, num_elem * sizeof(double));
out_file = fopen("output/p_error.out" , "w");
fprintf(out_file, "View \"p \" {\n");
for (i = 0; i < num_elem; i++) {
fprintf(out_file, "ST (%lf,%lf,0,%lf,%lf,0,%lf,%lf,0) {%lf,%lf,%lf};\n",
V1x[i], V1y[i], V2x[i], V2y[i], V3x[i], V3y[i],
Uv1[i], Uv2[i], Uv3[i]);
}
fprintf(out_file,"};");
fclose(out_file);
// free variables
free_gpu();
free(Uu1);
free(Uu2);
free(Uu3);
free(Uv1);
free(Uv2);
free(Uv3);
free(V1x);
free(V1y);
free(V2x);
free(V2y);
free(V3x);
free(V3y);
free(elem_s1);
free(elem_s2);
free(elem_s3);
free(sides_x1);
free(sides_x2);
free(sides_y1);
free(sides_y2);
free(left_elem);
free(right_elem);
free(left_side_number);
free(right_side_number);
free(r1_local);
free(r2_local);
free(w_local);
free(s_r);
free(oned_w_local);
return 0;
}