int main(int argc, char **argv)
{
int np[2], inplace, loops;
ptrdiff_t n[3];
unsigned opt, tune, destroy_input;
/* Set size of FFT and process mesh */
n[0] = 29; n[1] = 27; n[2] = 31;
np[0] = 2; np[1] = 2;
inplace = 0;
opt = PFFT_ESTIMATE;
tune = PFFT_NO_TUNE;
destroy_input = PFFT_PRESERVE_INPUT;
loops = 1;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* set parameters by command line */
init_parameters(argc, argv, n, np, &loops, &inplace, &opt, &tune, &destroy_input);
measure_pfft(n, np, MPI_COMM_WORLD, loops, inplace, opt | tune | destroy_input);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
int np[2];
ptrdiff_t n[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
pfft_complex *in, *out;
pfft_plan plan=NULL;
MPI_Comm comm_cart_2d;
/* Set size of FFT and process mesh */
n[0] = 2; n[1] = 2; n[2] = 4;
np[0] = 2; np[1] = 2;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1] */
pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1],
&comm_cart_2d);
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_3d(
n, comm_cart_2d, PFFT_TRANSPOSED_NONE,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_complex(alloc_local);
out = pfft_alloc_complex(alloc_local);
/* Plan parallel forward FFT */
plan = pfft_plan_dft_3d(n, in, out, comm_cart_2d,
PFFT_FORWARD, PFFT_TRANSPOSED_NONE);
/* Initialize input with random numbers */
pfft_init_input_complex_3d(n, local_ni, local_i_start,
in);
/* Execute parallel forward FFT */
pfft_execute(plan);
/* free mem and finalize MPI */
pfft_destroy_plan(plan);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[2];
ptrdiff_t n[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err;
double *planned_in, *executed_in;
pfft_complex *planned_out, *executed_out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
/* Set size of FFT and process mesh */
n[0] = 29; n[1] = 27; n[2] = 31;
np[0] = 2; np[1] = 2;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_r2c_3d(n, comm_cart_2d, PFFT_TRANSPOSED_OUT| PFFT_PADDED_R2C,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory for planning */
planned_in = pfft_alloc_real (2 * alloc_local);
planned_out = pfft_alloc_complex(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_dft_r2c_3d(
n, planned_in, planned_out, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_OUT| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_PADDED_R2C);
/* Plan parallel backward FFT */
plan_back = pfft_plan_dft_c2r_3d(
n, planned_out, planned_in, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_IN| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_PADDED_C2R);
/* Free planning arrays since we use other arrays for execution */
pfft_free(planned_in); pfft_free(planned_out);
/* Allocate memory for execution */
executed_in = pfft_alloc_real(2 * alloc_local);
executed_out = pfft_alloc_complex(alloc_local);
/* Initialize input with random numbers */
pfft_init_input_real(3, n, local_ni, local_i_start,
executed_in);
/* execute parallel forward FFT */
pfft_execute_dft_r2c(plan_forw, executed_in, executed_out);
/* clear the old input */
pfft_clear_input_real(3, n, local_ni, local_i_start,
executed_in);
/* execute parallel backward FFT */
pfft_execute_dft_c2r(plan_back, executed_out, executed_in);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
executed_in[l] /= (n[0]*n[1]*n[2]);
/* Print error of back transformed data */
err = pfft_check_output_real(3, n, local_ni, local_i_start, executed_in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(executed_in); pfft_free(executed_out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[2];
ptrdiff_t n[3], ni[3], howmany;
double err;
ptrdiff_t alloc_local_c;
ptrdiff_t local_ni_c[3], local_i_start_c[3];
ptrdiff_t local_no_c[3], local_o_start_c[3];
pfft_complex *in_c, *out_c;
pfft_plan plan_forw_c=NULL, plan_back_c=NULL;
ptrdiff_t alloc_local_r, alloc_local_forw, alloc_local_back;
ptrdiff_t local_ni_r[3], local_i_start_r[3];
ptrdiff_t local_no_r[3], local_o_start_r[3];
pfft_complex *in_r;
double *out_r;
pfft_plan plan_forw_r=NULL, plan_back_r=NULL;
MPI_Comm comm_cart_2d;
/* Set size of FFT and process mesh */
ni[0] = 4; ni[1] = 4; ni[2] = 4;
n[0] = 6; n[1] = 6; n[2] = 6;
np[0] = 2; np[1] = 2;
howmany = 1;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local_forw = pfft_local_size_many_dft(3, n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, comm_cart_2d, PFFT_TRANSPOSED_NONE| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT,
local_ni_c, local_i_start_c, local_no_c, local_o_start_c);
alloc_local_back = pfft_local_size_many_dft(3, n, n, ni, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, comm_cart_2d, PFFT_TRANSPOSED_NONE| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT,
local_no_c, local_o_start_c, local_ni_c, local_i_start_c);
alloc_local_c = (alloc_local_forw > alloc_local_back) ? alloc_local_forw : alloc_local_back;
alloc_local_forw = pfft_local_size_many_dft_c2r(3, n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, comm_cart_2d, PFFT_TRANSPOSED_NONE| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT,
local_ni_r, local_i_start_r, local_no_r, local_o_start_r);
alloc_local_back = pfft_local_size_many_dft_r2c(3, n, n, ni, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, comm_cart_2d, PFFT_TRANSPOSED_NONE| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT,
local_no_r, local_o_start_r, local_ni_r, local_i_start_r);
alloc_local_r = (alloc_local_forw > alloc_local_back) ? alloc_local_forw : alloc_local_back;
/* Allocate memory */
in_c = pfft_alloc_complex(alloc_local_c);
out_c = pfft_alloc_complex(alloc_local_c);
in_r = pfft_alloc_complex(alloc_local_r);
out_r = pfft_alloc_real(2*alloc_local_r);
/* Plan parallel forward FFT */
plan_forw_c = pfft_plan_many_dft(3,
n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, in_c, out_c, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT);
plan_forw_r = pfft_plan_many_dft_c2r(3,
n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, in_r, out_r, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT);
/* Plan parallel backward FFT */
plan_back_c = pfft_plan_many_dft(3,
n, n, ni, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, out_c, in_c, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT);
plan_back_r = pfft_plan_many_dft_r2c(3,
n, n, ni, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS, out_r, in_r, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_SHIFTED_IN | PFFT_SHIFTED_OUT);
/* Initialize input with random numbers */
init_input(ni, local_ni_c, local_i_start_c, in_c);
init_input(ni, local_ni_r, local_i_start_r, in_r);
// pfft_apr_complex_3d(in_c, local_ni_c, local_i_start_c, "c2c input:\n", comm_cart_2d);
// pfft_apr_complex_3d(in_r, local_ni_r, local_i_start_r, "c2r input:\n", comm_cart_2d);
/* execute parallel forward FFT */
pfft_execute(plan_forw_c);
/* clear the old input */
pfft_execute(plan_forw_r);
// pfft_apr_complex_3d(out_c, local_no_c, local_o_start_c, "c2c output:\n", comm_cart_2d);
// pfft_apr_real_3d(out_r, local_no_r, local_o_start_r, "c2r output:\n", comm_cart_2d);
/* execute parallel backward FFT */
pfft_execute(plan_back_c);
pfft_execute(plan_back_r);
// pfft_apr_complex_3d(in_c, local_ni_c, local_i_start_c, "c2c^ output:\n", comm_cart_2d);
// pfft_apr_complex_3d(in_r, local_ni_r, local_i_start_r, "c2r^ output:\n", comm_cart_2d);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni_c[0] * local_ni_c[1] * local_ni_c[2]; l++)
in_c[l] /= (n[0]*n[1]*n[2]);
for(ptrdiff_t l=0; l < local_ni_r[0] * local_ni_r[1] * local_ni_r[2]; l++)
in_r[l] /= (n[0]*n[1]*n[2]);
/* Print error of back transformed data */
err = compare_c2c_c2r(local_ni_c, local_ni_r, in_c, in_r, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw_c);
pfft_destroy_plan(plan_back_c);
pfft_destroy_plan(plan_forw_r);
pfft_destroy_plan(plan_back_r);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in_c); pfft_free(out_c);
pfft_free(in_r); pfft_free(out_r);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[2];
ptrdiff_t n[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err;
pfft_complex *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
double time;
pfft_timer timer_forw, timer_back;
unsigned pfft_opt_flag;
/* setup default parameters */
int iter = 10, inplace = 0, patience = 0;
/* Set size of FFT and process mesh */
n[0] = n[1] = n[2] = 16;
np[0] = 2; np[1] = 2;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* read parameters from command line */
init_parameters(argc, argv, np, n, &iter, &inplace, &patience);
/* setup FFTWs planing depth */
switch(patience){
case 1: pfft_opt_flag = PFFT_MEASURE; break;
case 2: pfft_opt_flag = PFFT_PATIENT; break;
case 3: pfft_opt_flag = PFFT_EXHAUSTIVE; break;
default: pfft_opt_flag = PFFT_ESTIMATE;
}
pfft_opt_flag |= PFFT_DESTROY_INPUT;
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: Procmesh %d x %d requires MPI launch with %d processes.\n",
np[0], np[1], np[0]*np[1]);
MPI_Finalize();
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_3d(n, comm_cart_2d, PFFT_TRANSPOSED_OUT,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_complex(alloc_local);
out = (inplace) ? in : pfft_alloc_complex(alloc_local);
/* We often want to scale large FFTs, which do not fit on few processes. */
if( (in == NULL) || (out == NULL)){
fprintf(stderr, "!!! Error: Not enough memory to allocate input/output arrays !!!\n");
MPI_Finalize();
MPI_Finalize();
return 1;
}
/* Plan parallel forward FFT */
time = -MPI_Wtime();
plan_forw = pfft_plan_dft_3d(
n, in, out, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_OUT| pfft_opt_flag);
time += MPI_Wtime();
// printf("time for forw planing: %.2e\n", time);
/* Plan parallel backward FFT */
time = -MPI_Wtime();
plan_back = pfft_plan_dft_3d(
n, out, in, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_IN| pfft_opt_flag);
time += MPI_Wtime();
// printf("time for back planing: %.2e\n", time);
/* Initialize input with random numbers */
pfft_init_input_c2c_3d(n, local_ni, local_i_start,
in);
for(int t=0; t<iter; t++){
/* execute parallel forward FFT */
pfft_execute(plan_forw);
/* execute parallel backward FFT */
pfft_execute(plan_back);
}
/* check individual timers for workbalance */
timer_forw = pfft_get_timer(plan_forw);
// printf("timer_forw->whole = %.2e\n", timer_forw->whole);
pfft_destroy_timer(timer_forw);
timer_back = pfft_get_timer(plan_back);
// printf("timer_back->whole = %.2e\n", timer_back->whole);
pfft_destroy_timer(timer_back);
/* read out PFFT timers */
pfft_print_average_timer_adv(plan_forw, comm_cart_2d);
pfft_print_average_timer_adv(plan_back, comm_cart_2d);
if(inplace){
pfft_write_average_timer_adv(plan_forw, "measure_forw_inplace.m", comm_cart_2d);
pfft_write_average_timer_adv(plan_back, "measure_back_inplace.m", comm_cart_2d);
} else {
pfft_write_average_timer_adv(plan_forw, "measure_forw_outofplace.m", comm_cart_2d);
pfft_write_average_timer_adv(plan_back, "measure_back_outofplace.m", comm_cart_2d);
}
/* Scale data */
for(int t=0; t<iter; t++)
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (n[0]*n[1]*n[2]);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_c2c_3d(n, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); if(!inplace) pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
int np[2];
ptrdiff_t n[3], ni[3], no[3];
ptrdiff_t alloc_local_forw, alloc_local_back, alloc_local, howmany;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_n[3], local_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err, *in;
pfft_complex *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
/* Set size of FFT and process mesh */
ni[0] = ni[1] = ni[2] = 16;
n[0] = 29; n[1] = 27; n[2] = 31;
for(int t=0; t<3; t++)
no[t] = ni[t];
np[0] = 2; np[1] = 2;
howmany = 1;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local_forw = pfft_local_size_many_dft_r2c(3, n, ni, n, howmany,
PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
comm_cart_2d, PFFT_TRANSPOSED_NONE | PFFT_PADDED_R2C,
local_ni, local_i_start, local_n, local_start);
alloc_local_back = pfft_local_size_many_dft_c2r(3, n, n, no, howmany,
PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
comm_cart_2d, PFFT_TRANSPOSED_NONE | PFFT_PADDED_R2C,
local_n, local_start, local_no, local_o_start);
/* Allocate enough memory for both trafos */
alloc_local = (alloc_local_forw > alloc_local_back) ?
alloc_local_forw : alloc_local_back;
in = pfft_alloc_real(2 * alloc_local);
out = pfft_alloc_complex(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_many_dft_r2c(
3, n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
in, out, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_PADDED_R2C);
/* Plan parallel backward FFT */
plan_back = pfft_plan_many_dft_c2r(
3, n, n, no, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
out, in, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_PADDED_R2C);
/* Initialize input with random numbers */
pfft_init_input_real(3, ni, local_ni, local_i_start,
in);
/* Execute parallel forward FFT */
pfft_execute(plan_forw);
/* clear the old input */
pfft_clear_input_real(3, ni, local_ni, local_i_start,
in);
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (n[0]*n[1]*n[2]);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_real(3, ni, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize MPI */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int n[3];
pfft_complex *in, *out;
FFTW(plan) plan_forw=NULL, plan_back=NULL;
double err, time, time_fftw[2], max_time_fftw[2];
unsigned fftw_flag;
/* setup default parameters */
int iter = 10, inplace = 0, patience = 0;
/* Set size of FFT and process mesh */
n[0] = n[1] = n[2] = 16;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* read parameters from command line */
init_parameters(argc, argv, n, &iter, &inplace, &patience);
/* setup FFTWs planing depth */
switch(patience){
case 1: fftw_flag = FFTW_MEASURE; break;
case 2: fftw_flag = FFTW_PATIENT; break;
case 3: fftw_flag = FFTW_EXHAUSTIVE; break;
default: fftw_flag = FFTW_ESTIMATE;
}
if(!inplace)
fftw_flag |= FFTW_DESTROY_INPUT;
/* Allocate memory */
in = pfft_alloc_complex(n[0]*n[1]*n[2]);
out = (inplace) ? in : pfft_alloc_complex(n[0]*n[1]*n[2]);
/* We often want to scale large FFTs, which do not fit on few processes. */
if( (in == NULL) || (out == NULL)){
fprintf(stderr, "!!! Error: Not enough memory to allocate input/output arrays !!!\n");
MPI_Finalize();
MPI_Finalize();
return 1;
}
ptrdiff_t local_ni[3], local_i_start[3], n_ptr[3];
for(int t=0; t<3; t++){
local_i_start[t] = 0;
n_ptr[t] = local_ni[t] = (ptrdiff_t) n[t];
}
plan_forw = FFTW(plan_dft_3d)(n[0], n[1], n[2], in, out, FFTW_FORWARD, fftw_flag);
plan_back = FFTW(plan_dft_3d)(n[0], n[1], n[2], out, in, FFTW_BACKWARD, fftw_flag);
/* Initialize input with random numbers */
pfft_init_input_complex_3d(n_ptr, local_ni, local_i_start,
in);
time_fftw[0] = time_fftw[1] = 0;
for(int t=0; t<iter; t++){
/* execute parallel forward FFT */
time_fftw[0] -= MPI_Wtime();
FFTW(execute)(plan_forw);
time_fftw[0] += MPI_Wtime();
/* execute parallel backward FFT */
time_fftw[1] -= MPI_Wtime();
FFTW(execute)(plan_back);
time_fftw[1] += MPI_Wtime();
}
/* Scale data */
for(int t=0; t<iter; t++)
for(ptrdiff_t l=0; l < n[0] * n[1] * n[2]; l++)
in[l] /= (n[0]*n[1]*n[2]);
printf("fftw_forw = %.2e, fftw_back = %.2e\n", time_fftw[0]/iter, time_fftw[1]/iter);
err = pfft_check_output_complex_3d(n_ptr, local_ni, local_i_start, in, MPI_COMM_WORLD);
printf("Error after several forward and backward FFTWs of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
printf("maxerror = %6.2e;\n", err);
/* free mem and finalize */
FFTW(destroy_plan)(plan_forw);
FFTW(destroy_plan)(plan_back);
pfft_free(in); if(!inplace) pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[3];
ptrdiff_t n[4], N[4];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[4], local_i_start[4];
ptrdiff_t local_no[4], local_o_start[4];
double err, *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_3d;
pfft_r2r_kind kinds_forw[4], kinds_back[4];
/* Set size of FFT and process mesh */
n[0] = 13; n[1] = 14; n[2] = 19; n[3] = 17;
np[0] = 2; np[1] = 2; np[2] = 2;
/* Set FFTW kinds of 1d R2R trafos */
kinds_forw[0] = PFFT_REDFT00; kinds_back[0] = PFFT_REDFT00;
kinds_forw[1] = PFFT_REDFT01; kinds_back[1] = PFFT_REDFT10;
kinds_forw[2] = PFFT_RODFT00; kinds_back[2] = PFFT_RODFT00;
kinds_forw[3] = PFFT_RODFT10; kinds_back[3] = PFFT_RODFT01;
/* Set logical DFT sizes corresponding to FFTW manual:
* for REDFT00 N=2*(n-1), for RODFT00 N=2*(n+1), otherwise N=2*n */
N[0] = 2*(n[0]-1);
N[1] = 2*n[1];
N[2] = 2*(n[2]+1);
N[3] = 2*n[3];
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create three-dimensional process grid of size np[0] x np[1] x np[2], if possible */
if( pfft_create_procmesh(3, MPI_COMM_WORLD, np, &comm_cart_3d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]*np[2]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_r2r(4, n, comm_cart_3d, PFFT_TRANSPOSED_NONE,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_real(alloc_local);
out = pfft_alloc_real(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_r2r(
4, n, in, out, comm_cart_3d, kinds_forw, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Plan parallel backward FFT */
plan_back = pfft_plan_r2r(
4, n, out, in, comm_cart_3d, kinds_back, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Initialize input with random numbers */
pfft_init_input_real(4, n, local_ni, local_i_start,
in);
/* execute parallel forward FFT */
pfft_execute(plan_forw);
/* clear the old input */
pfft_clear_input_real(4, n, local_ni, local_i_start,
in);
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2] * local_ni[3]; l++)
in[l] /= (N[0]*N[1]*N[2]*N[3]);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_real(4, n, local_ni, local_i_start, in, comm_cart_3d);
pfft_printf(comm_cart_3d, "Error after one forward and backward trafo of size n=(%td, %td, %td, %td):\n", n[0], n[1], n[2], n[3]);
pfft_printf(comm_cart_3d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_3d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
int np[2];
ptrdiff_t n[3], ni[3], no[3], N[3];
ptrdiff_t alloc_local_forw, alloc_local_back, alloc_local, howmany;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_n[3], local_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err, *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
fftw_r2r_kind kinds_forw[3], kinds_back[3];
/* Set size of FFT and process mesh */
ni[0] = ni[1] = ni[2] = 16;
n[0] = 29; n[1] = 27; n[2] = 31;
for(int t=0; t<3; t++)
no[t] = ni[t];
np[0] = 2; np[1] = 2;
howmany = 1;
/* Set PFFT kinds of 1d R2R trafos */
kinds_forw[0] = PFFT_REDFT00; kinds_back[0] = PFFT_REDFT00;
kinds_forw[1] = PFFT_REDFT01; kinds_back[1] = PFFT_REDFT10;
kinds_forw[2] = PFFT_RODFT00; kinds_back[2] = PFFT_RODFT00;
/* Set logical DFT sizes corresponding to FFTW manual:
* for REDFT00 N=2*(n-1), for RODFT00 N=2*(n+1), otherwise N=2*n */
N[0] = 2*(n[0]-1);
N[1] = 2*n[1];
N[2] = 2*(n[2]+1);
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local_forw = pfft_local_size_many_r2r(3, n, ni, n, howmany,
PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
comm_cart_2d, PFFT_TRANSPOSED_OUT,
local_ni, local_i_start, local_n, local_start);
alloc_local_back = pfft_local_size_many_r2r(3, n, n, no, howmany,
PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
comm_cart_2d, PFFT_TRANSPOSED_IN,
local_n, local_start, local_no, local_o_start);
/* Allocate enough memory for both trafos */
alloc_local = (alloc_local_forw > alloc_local_back) ?
alloc_local_forw : alloc_local_back;
in = fftw_alloc_real(alloc_local);
out = fftw_alloc_real(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_many_r2r(
3, n, ni, n, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
in, out, comm_cart_2d, kinds_forw, PFFT_TRANSPOSED_OUT| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Plan parallel backward FFT */
plan_back = pfft_plan_many_r2r(
3, n, n, no, howmany, PFFT_DEFAULT_BLOCKS, PFFT_DEFAULT_BLOCKS,
out, in, comm_cart_2d, kinds_back, PFFT_TRANSPOSED_IN| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Initialize input with random numbers */
pfft_init_input_real_3d(ni, local_ni, local_i_start,
in);
/* Execute parallel forward FFT */
pfft_execute(plan_forw);
/* clear the old input */
pfft_clear_input_real_3d(ni, local_ni, local_i_start,
in);
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (N[0]*N[1]*N[2]);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_real_3d(ni, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize MPI */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
fftw_free(in); fftw_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[2];
ptrdiff_t n[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err;
pfft_complex *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
/* Set size of FFT and process mesh */
n[0] = 2; n[1] = 2; n[2] = 4;
np[0] = 2; np[1] = 2;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_3d(n, comm_cart_2d, PFFT_TRANSPOSED_NONE,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_complex(alloc_local);
out = pfft_alloc_complex(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_dft_3d(
n, in, out, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Plan parallel backward FFT */
plan_back = pfft_plan_dft_3d(
n, out, in, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_NONE| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Initialize input with random numbers */
pfft_init_input_complex_3d(n, local_ni, local_i_start,
in);
/* Print input data */
pfft_apr_complex_3d(
in, local_ni, local_i_start,
"PFFT, g_hat", MPI_COMM_WORLD);
/* execute parallel forward FFT */
pfft_execute(plan_forw);
/* Print transformed data */
pfft_apr_complex_3d(
out, local_no, local_o_start,
"PFFT, g", MPI_COMM_WORLD);
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (n[0]*n[1]*n[2]);
/* Print back transformed data */
pfft_apr_complex_3d(
in, local_ni, local_i_start,
"PFFT^H, g_hat", MPI_COMM_WORLD);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_complex_3d(n, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize MPI */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv){
ptrdiff_t n[3], gc_below[3], gc_above[3];
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
ptrdiff_t local_ngc[3], local_gc_start[3];
ptrdiff_t alloc_local, alloc_local_gc;
int np[3], rnk_self, size, verbose;
double err;
MPI_Comm comm_cart_2d;
pfft_complex *data;
pfft_gcplan ths;
MPI_Init(&argc, &argv);
pfft_init();
MPI_Comm_rank(MPI_COMM_WORLD, &rnk_self);
MPI_Comm_size(MPI_COMM_WORLD, &size);
/* default values */
n[0] = n[1] = n[2] = 8; /* n[0] = 3; n[1] = 5; n[2] = 7;*/
np[0]=2; np[1]=2; np[2] = 1;
verbose = 0;
for(int t=0; t<3; t++){
gc_below[t] = 0;
gc_above[t] = 0;
}
gc_below[0] = 0;
gc_above[0] = 8;
/* set values by commandline */
init_parameters(argc, argv, n, np, gc_below, gc_above, &verbose);
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_3d(n, comm_cart_2d, PFFT_TRANSPOSED_NONE,
local_ni, local_i_start, local_no, local_o_start);
alloc_local_gc = pfft_local_size_gc_3d(
local_ni, local_i_start, alloc_local, gc_below, gc_above,
local_ngc, local_gc_start);
/* Allocate memory */
data = pfft_alloc_complex(alloc_local_gc);
/* Plan parallel ghost cell send */
ths = pfft_plan_cgc_3d(n, gc_below, gc_above,
data, comm_cart_2d, PFFT_GC_NONTRANSPOSED);
/* Initialize input with random numbers */
pfft_init_input_c2c_3d(n, local_ni, local_i_start,
data);
/* check gcell input */
if(verbose)
pfft_apr_complex_3d(data, local_ni, local_i_start, "gcell input", comm_cart_2d);
/* Execute parallel ghost cell send */
pfft_exchange(ths);
/* Check gcell output */
if(verbose)
pfft_apr_complex_3d(data, local_ngc, local_gc_start, "exchanged gcells", comm_cart_2d);
/* Execute adjoint parallel ghost cell send */
pfft_reduce(ths);
/* check input */
if(verbose)
pfft_apr_complex_3d(data, local_no, local_o_start, "reduced gcells", comm_cart_2d);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
data[l] /= 3;
/* Print error of back transformed data */
MPI_Barrier(comm_cart_2d);
err = pfft_check_output_c2c_3d(n, local_ni, local_i_start, data, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one gcell exchange and reduce of size n=(%td, %td, %td),\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "gc_below = (%td, %td, %td), gc_above = (%td, %td, %td):\n", gc_below[0], gc_below[1], gc_below[2], gc_above[0], gc_above[1], gc_above[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_gcplan(ths);
MPI_Comm_free(&comm_cart_2d);
pfft_free(data);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int nthreads=1; /*number of threads to initialize openmp with*/
int runs=1; /*number of runs for testing*/
int np[2];
ptrdiff_t n[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err;
pfft_complex *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
/* Init OpenMP */
pfft_get_args(argc,argv,"-pfft_omp_threads",1,PFFT_INT,&nthreads);
pfft_get_args(argc,argv,"-pfft_runs",1,PFFT_INT,&runs);
pfft_plan_with_nthreads(nthreads);
/* Set size of FFT and process mesh */
n[0] = NNN;n[1] =NNN; n[2] =NNN;
np[0] = 1; np[1] = 1;
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
pfft_plan_with_nthreads(nthreads);
pfft_printf(MPI_COMM_WORLD, "# %4d threads will be used for openmp (default is 1)\n", nthreads);
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_dft_3d(n, comm_cart_2d, PFFT_TRANSPOSED_NONE,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_complex(alloc_local);
out = pfft_alloc_complex(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_dft_3d(
n, in, out, comm_cart_2d, PFFT_FORWARD, PFFT_TRANSPOSED_OUT| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_TUNE| PFFT_SHIFTED_IN);
/* Plan parallel backward FFT */
plan_back = pfft_plan_dft_3d(
n, out, in, comm_cart_2d, PFFT_BACKWARD, PFFT_TRANSPOSED_IN| PFFT_MEASURE| PFFT_DESTROY_INPUT| PFFT_TUNE| PFFT_SHIFTED_OUT);
/* Initialize input with random numbers */
pfft_init_input_complex_3d(n, local_ni, local_i_start,
in);
for(int i=0; i<runs; i++)
{
/* execute parallel forward FFT */
pfft_execute(plan_forw);
/* clear the old input */
/* pfft_clear_input_complex_3d(n, local_ni, local_i_start,
in);
*/
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
ptrdiff_t l;
for(l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (n[0]*n[1]*n[2]);
}
pfft_print_average_timer_adv(plan_forw, MPI_COMM_WORLD);
pfft_print_average_timer_adv(plan_back, MPI_COMM_WORLD);
/* Print error of back transformed data */
err = pfft_check_output_complex_3d(n, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after %d forward and backward trafos of size n=(%td, %td, %td):\n", runs, n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}
int main(int argc, char **argv)
{
int np[2];
ptrdiff_t n[3], N[3];
ptrdiff_t alloc_local;
ptrdiff_t local_ni[3], local_i_start[3];
ptrdiff_t local_no[3], local_o_start[3];
double err, *in, *out;
pfft_plan plan_forw=NULL, plan_back=NULL;
MPI_Comm comm_cart_2d;
pfft_r2r_kind kinds_forw[3], kinds_back[3];
/* Set size of FFT and process mesh */
n[0] = 29; n[1] = 27; n[2] = 31;
np[0] = 2; np[1] = 2;
/* Set FFTW kinds of 1d R2R trafos */
kinds_forw[0] = PFFT_REDFT00; kinds_back[0] = PFFT_REDFT00;
kinds_forw[1] = PFFT_REDFT01; kinds_back[1] = PFFT_REDFT10;
kinds_forw[2] = PFFT_RODFT00; kinds_back[2] = PFFT_RODFT00;
/* Set logical DFT sizes corresponding to FFTW manual:
* for REDFT00 N=2*(n-1), for RODFT00 N=2*(n+1), otherwise N=2*n */
N[0] = 2*(n[0]-1);
N[1] = 2*n[1];
N[2] = 2*(n[2]+1);
/* Initialize MPI and PFFT */
MPI_Init(&argc, &argv);
pfft_init();
/* Create two-dimensional process grid of size np[0] x np[1], if possible */
if( pfft_create_procmesh_2d(MPI_COMM_WORLD, np[0], np[1], &comm_cart_2d) ){
pfft_fprintf(MPI_COMM_WORLD, stderr, "Error: This test file only works with %d processes.\n", np[0]*np[1]);
MPI_Finalize();
return 1;
}
/* Get parameters of data distribution */
alloc_local = pfft_local_size_r2r_3d(n, comm_cart_2d, PFFT_TRANSPOSED_OUT,
local_ni, local_i_start, local_no, local_o_start);
/* Allocate memory */
in = pfft_alloc_real(alloc_local);
out = pfft_alloc_real(alloc_local);
/* Plan parallel forward FFT */
plan_forw = pfft_plan_r2r_3d(
n, in, out, comm_cart_2d, kinds_forw, PFFT_TRANSPOSED_OUT| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Plan parallel backward FFT */
plan_back = pfft_plan_r2r_3d(
n, out, in, comm_cart_2d, kinds_back, PFFT_TRANSPOSED_IN| PFFT_MEASURE| PFFT_DESTROY_INPUT);
/* Initialize input with random numbers */
pfft_init_input_real_3d(n, local_ni, local_i_start,
in);
int myrank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
// for(int t=0; t<size; t++){
// if(t == myrank){
// int m=0;
// for(int k0=0; k0<local_ni[0]; k0++)
// for(int k1=0; k1<local_ni[1]; k1++){
// for(int k2=0; k2<local_ni[2]; k2++, m++)
// printf("in[%d, %d, %d] = %.2f\t", k0+local_i_start[0], k1+local_i_start[1], k2+local_i_start[2], in[m]);
// printf("\n");
// }
// }
// fflush(stderr);
// MPI_Barrier(MPI_COMM_WORLD);
// }
/* execute parallel forward FFT */
pfft_execute(plan_forw);
// for(int t=0; t<size; t++){
// if(t == myrank){
// int m=0;
// for(int k1=0; k1<local_no[1]; k1++)
// for(int k2=0; k2<local_no[2]; k2++){
// for(int k0=0; k0<local_no[0]; k0++, m++)
// printf("out[%d, %d, %d] = %.2f\t", k0+local_o_start[0], k1+local_o_start[1], k2+local_o_start[2], out[m]);
// printf("\n");
// }
// }
// fflush(stderr);
// MPI_Barrier(MPI_COMM_WORLD);
// }
/* execute parallel backward FFT */
pfft_execute(plan_back);
/* Scale data */
for(ptrdiff_t l=0; l < local_ni[0] * local_ni[1] * local_ni[2]; l++)
in[l] /= (N[0]*N[1]*N[2]);
/* Print error of back transformed data */
MPI_Barrier(MPI_COMM_WORLD);
err = pfft_check_output_real_3d(n, local_ni, local_i_start, in, comm_cart_2d);
pfft_printf(comm_cart_2d, "Error after one forward and backward trafo of size n=(%td, %td, %td):\n", n[0], n[1], n[2]);
pfft_printf(comm_cart_2d, "maxerror = %6.2e;\n", err);
/* free mem and finalize */
pfft_destroy_plan(plan_forw);
pfft_destroy_plan(plan_back);
MPI_Comm_free(&comm_cart_2d);
pfft_free(in); pfft_free(out);
MPI_Finalize();
return 0;
}