int main(int argc, char **argv){
int np[3], m, window;
unsigned window_flag;
ptrdiff_t N[3], n[3], local_M;
double f_hat_sum, x_max[3];
pnfft_complex *f1, *f2;
MPI_Init(&argc, &argv);
pnfft_init();
/* set default values */
N[0] = N[1] = N[2] = 16;
n[0] = n[1] = n[2] = 0;
local_M = 0;
m = 6;
window = 4;
x_max[0] = x_max[1] = x_max[2] = 0.5;
np[0]=2; np[1]=2; np[2]=2;
/* set parameters by command line */
init_parameters(argc, argv, N, n, &local_M, &m, &window, x_max, np);
/* if M or n are set to zero, we choose nice values */
local_M = (local_M==0) ? N[0]*N[1]*N[2]/(np[0]*np[1]*np[2]) : local_M;
for(int t=0; t<3; t++)
n[t] = (n[t]==0) ? 2*N[t] : n[t];
switch(window){
case 0: window_flag = PNFFT_WINDOW_GAUSSIAN; break;
case 1: window_flag = PNFFT_WINDOW_BSPLINE; break;
case 2: window_flag = PNFFT_WINDOW_SINC_POWER; break;
case 3: window_flag = PNFFT_WINDOW_BESSEL_I0; break;
default: window_flag = PNFFT_WINDOW_KAISER_BESSEL;
}
pfft_printf(MPI_COMM_WORLD, "******************************************************************************************************\n");
pfft_printf(MPI_COMM_WORLD, "* Computation of parallel NFFT\n");
pfft_printf(MPI_COMM_WORLD, "* for N[0] x N[1] x N[2] = %td x %td x %td Fourier coefficients (change with -pnfft_N * * *)\n", N[0], N[1], N[2]);
pfft_printf(MPI_COMM_WORLD, "* at local_M = %td nodes per process (change with -pnfft_local_M *)\n", local_M);
pfft_printf(MPI_COMM_WORLD, "* with n[0] x n[1] x n[2] = %td x %td x %td FFT grid size (change with -pnfft_n * * *),\n", n[0], n[1], n[2]);
pfft_printf(MPI_COMM_WORLD, "* m = %d real space cutoff (change with -pnfft_m *),\n", m);
pfft_printf(MPI_COMM_WORLD, "* window = %d window function ", window);
switch(window){
case 0: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_GAUSSIAN) "); break;
case 1: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_BSPLINE) "); break;
case 2: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_SINC_POWER) "); break;
case 3: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_BESSEL_I0) "); break;
default: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_KAISER_BESSEL) "); break;
}
pfft_printf(MPI_COMM_WORLD, "(change with -pnfft_window *),\n");
pfft_printf(MPI_COMM_WORLD, "* on np[0] x np[1] x np[2] = %td x %td x %td processes (change with -pnfft_np * * *)\n", np[0], np[1], np[2]);
pfft_printf(MPI_COMM_WORLD, "*******************************************************************************************************\n\n");
/* calculate parallel NFFT */
pnfft_perform_guru(N, n, local_M, m, x_max, window_flag, np, MPI_COMM_WORLD,
&f1, &f_hat_sum);
/* calculate parallel NFFT with higher accuracy */
pnfft_perform_guru(N, n, local_M, m+2, x_max, PNFFT_WINDOW_KAISER_BESSEL, np, MPI_COMM_WORLD,
&f2, &f_hat_sum);
/* calculate error of PNFFT */
compare_f(f1, f2, local_M, f_hat_sum, "* Results in", MPI_COMM_WORLD);
/* free mem and finalize */
pnfft_free(f1); pnfft_free(f2);
pnfft_cleanup();
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
int np[3];
ptrdiff_t N[3], local_M;
ptrdiff_t local_N[3], local_N_start[3];
double lower_border[3], upper_border[3];
MPI_Comm comm_cart_3d;
pnfft_complex *f_hat, *f;
double *x;
pnfft_plan pnfft;
MPI_Init(&argc, &argv);
pnfft_init();
/* Set default values */
N[0] = N[1] = N[2] = 16;
np[0]=2; np[1]=2; np[2]=2;
local_M = N[0]*N[1]*N[2]/(np[0]*np[1]*np[2]);
/* Print infos */
pfft_printf(MPI_COMM_WORLD, "******************************************************************************************************\n");
pfft_printf(MPI_COMM_WORLD, "* Computation of parallel NFFT\n");
pfft_printf(MPI_COMM_WORLD, "* for N[0] x N[1] x N[2] = %td x %td x %td Fourier coefficients\n", N[0], N[1], N[2]);
pfft_printf(MPI_COMM_WORLD, "* at local_M = %td nodes per process\n", local_M);
pfft_printf(MPI_COMM_WORLD, "* on np[0] x np[1] x np[2] = %td x %td x %td processes\n", np[0], np[1], np[2]);
pfft_printf(MPI_COMM_WORLD, "*******************************************************************************************************\n\n");
/* create three-dimensional process grid of size np[0] x np[1] x np[2], if possible */
if( pnfft_create_procmesh(3, MPI_COMM_WORLD, np, &comm_cart_3d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: Procmesh of size %d x %d x %d does not fit to number of allocated processes.\n", np[0], np[1], np[2]);
pfft_fprintf(MPI_COMM_WORLD, stderr, " Please allocate %d processes (mpiexec -np %d ...) or change the procmesh (with -pnfft_np * * *).\n", np[0]*np[1]*np[2], np[0]*np[1]*np[2]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
pnfft_local_size_3d(N, comm_cart_3d, PNFFT_TRANSPOSED_NONE,
local_N, local_N_start, lower_border, upper_border);
/* Plan parallel NFFT */
pnfft = pnfft_init_3d(N, local_M, comm_cart_3d);
/* Get data pointers */
f_hat = pnfft_get_f_hat(pnfft);
f = pnfft_get_f(pnfft);
x = pnfft_get_x(pnfft);
/* Initialize Fourier coefficients */
pnfft_init_f_hat_3d(N, local_N, local_N_start, PNFFT_TRANSPOSED_NONE,
f_hat);
/* Initialize nonequispaced nodes */
init_random_x(lower_border, upper_border, local_M,
x);
/* Print input Fourier coefficents */
vpr_complex(comm_cart_3d, 8, f_hat,
"Input Fourier coefficients on process 1:");
/* Execute parallel NFFT */
pnfft_trafo(pnfft);
/* Print NFFT results */
vpr_complex(comm_cart_3d, 8, f,
"PNFFT Results on process 1:");
/* Execute parallel adjoint NFFT */
pnfft_adj(pnfft);
/* Scale data */
for(ptrdiff_t l=0; l < local_N[0] * local_N[1] * local_N[2]; l++)
f_hat[l] /= (N[0]*N[1]*N[2]);
/* Print output Fourier coefficents */
vpr_complex(comm_cart_3d, 8, f_hat,
"Fourier coefficients after one forward and backward PNFFT on process 1:");
/* free mem and finalize */
pnfft_finalize(pnfft, PNFFT_FREE_X | PNFFT_FREE_F_HAT| PNFFT_FREE_F);
MPI_Comm_free(&comm_cart_3d);
pnfft_cleanup();
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
int np[3], m, window, interlacing;
ptrdiff_t N[3], n[3], local_M;
double x_max[3];
MPI_Init(&argc, &argv);
pnfft_init();
/* set default values */
N[0] = N[1] = N[2] = 16;
n[0] = n[1] = n[2] = 0;
local_M = 0;
m = 6;
window = 4;
interlacing = 0;
x_max[0] = x_max[1] = x_max[2] = 0.5;
np[0]=2; np[1]=2; np[2]=2;
/* set parameters by command line */
int intpol = -1;
init_parameters(argc, argv, N, n, &local_M, &m, &window, &intpol, &interlacing, x_max, np);
/* if M or n are set to zero, we choose nice values */
local_M = (local_M==0) ? N[0]*N[1]*N[2]/(np[0]*np[1]*np[2]) : local_M;
for(int t=0; t<3; t++)
n[t] = (n[t]==0) ? 2*N[t] : n[t];
unsigned window_flag;
switch(window){
case 0: window_flag = PNFFT_WINDOW_GAUSSIAN; break;
case 1: window_flag = PNFFT_WINDOW_BSPLINE; break;
case 2: window_flag = PNFFT_WINDOW_SINC_POWER; break;
case 3: window_flag = PNFFT_WINDOW_BESSEL_I0; break;
case 4: window_flag = PNFFT_WINDOW_KAISER_BESSEL; break;
case 5: window_flag = PNFFT_WINDOW_GAUSSIAN_T; break;
default: window_flag = PNFFT_WINDOW_GAUSSIAN; window = 0;
}
unsigned intpol_flag;
switch(intpol){
case 0: intpol_flag = PNFFT_PRE_CONST_PSI; break;
case 1: intpol_flag = PNFFT_PRE_LIN_PSI; break;
case 2: intpol_flag = PNFFT_PRE_QUAD_PSI; break;
case 3: intpol_flag = PNFFT_PRE_CUB_PSI; break;
default: intpol_flag = (window==0) ? PNFFT_FG_PSI : 0;
}
unsigned interlacing_flag = (interlacing) ? PNFFT_INTERLACED : 0;
pfft_printf(MPI_COMM_WORLD, "******************************************************************************************************\n");
pfft_printf(MPI_COMM_WORLD, "* Computation of parallel NFFT\n");
pfft_printf(MPI_COMM_WORLD, "* for N[0] x N[1] x N[2] = %td x %td x %td Fourier coefficients (change with -pnfft_N * * *)\n", N[0], N[1], N[2]);
pfft_printf(MPI_COMM_WORLD, "* at local_M = %td nodes per process (change with -pnfft_local_M *)\n", local_M);
pfft_printf(MPI_COMM_WORLD, "* with n[0] x n[1] x n[2] = %td x %td x %td FFT grid size (change with -pnfft_n * * *),\n", n[0], n[1], n[2]);
pfft_printf(MPI_COMM_WORLD, "* m = %d real space cutoff (change with -pnfft_m *),\n", m);
pfft_printf(MPI_COMM_WORLD, "* window = %d window function ", window);
switch(window){
case 0: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_GAUSSIAN) "); break;
case 1: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_BSPLINE) "); break;
case 2: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_SINC_POWER) "); break;
case 3: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_BESSEL_I0) "); break;
case 4: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_KAISER_BESSEL) "); break;
case 5: pfft_printf(MPI_COMM_WORLD, "(PNFFT_WINDOW_GAUSSIAN_T) "); break;
}
pfft_printf(MPI_COMM_WORLD, "(change with -pnfft_window *),\n");
pfft_printf(MPI_COMM_WORLD, "* intpol = %d interpolation order ", intpol);
switch(intpol){
case 0: pfft_printf(MPI_COMM_WORLD, "(PNFFT_PRE_CONST_PSI) "); break;
case 1: pfft_printf(MPI_COMM_WORLD, "(PNFFT_PRE_LIN_PSI) "); break;
case 2: pfft_printf(MPI_COMM_WORLD, "(PNFFT_PRE_QUAD_PSI) "); break;
case 3: pfft_printf(MPI_COMM_WORLD, "(PNFFT_PRE_CUB_PSI) "); break;
default: if(window==0 || window==5)
pfft_printf(MPI_COMM_WORLD, "(PNFFT_FG_PSI) ");
else
pfft_printf(MPI_COMM_WORLD, "(No interpolation enabled) ");
}
pfft_printf(MPI_COMM_WORLD, "(change with -pnfft_intpol *),\n");
if(interlacing)
pfft_printf(MPI_COMM_WORLD, "* interlacing = enabled (disable with -pnfft_interlacing 0)");
else
pfft_printf(MPI_COMM_WORLD, "* interlacing = disabled (enable with -pnfft_interlacing 1)");
pfft_printf(MPI_COMM_WORLD, "* on np[0] x np[1] x np[2] = %td x %td x %td processes (change with -pnfft_np * * *)\n", np[0], np[1], np[2]);
pfft_printf(MPI_COMM_WORLD, "*******************************************************************************************************\n\n");
/* calculate parallel NFFT */
pnfft_perform_guru(N, n, local_M, m, x_max, window_flag| intpol_flag| interlacing_flag, np, MPI_COMM_WORLD);
/* free mem and finalize */
pnfft_cleanup();
MPI_Finalize();
return 0;
}