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Added comment on Nvalues[] and N purpose

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This commit is contained in:
doinachiroiu 2020-08-20 08:21:32 +00:00
parent 096d02625d
commit 94fcf82dd3
1 changed files with 18 additions and 3 deletions
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21
oss-internship-2020/pffft/test_pffft_sandboxed.cc
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@ -62,6 +62,13 @@ void show_output(const char* name, int N, int cplx, float flops, float t0,
int main(int argc, char* argv[]) { int main(int argc, char* argv[]) {
gflags::ParseCommandLineFlags(&argc, &argv, true); gflags::ParseCommandLineFlags(&argc, &argv, true);
/*
* Nvalues is a vector keeping the values by which iterates N, its value
* representing the input length. More concrete, N is the number of
* data points the caclulus is up to (determinating its accuracy).
* To show the performance of Fast-Fourier Transformations the program is
* testing for various values of N.
*/
int Nvalues[] = {64, 96, 128, 160, 192, 256, int Nvalues[] = {64, 96, 128, 160, 192, 256,
384, 5 * 96, 512, 5 * 128, 3 * 256, 800, 384, 5 * 96, 512, 5 * 128, 3 * 256, 800,
1024, 2048, 2400, 4096, 8192, 9 * 1024, 1024, 2048, 2400, 4096, 8192, 9 * 1024,
@ -118,10 +125,16 @@ int main(int argc, char* argv[]) {
X[k] = 0; X[k] = 0;
} }
// FFTPack benchmark /*
* FFTPack benchmark
*/
{ {
/*
* SIMD_SZ == 4 (returning value of pffft_simd_size())
*/
int max_iter_ = int max_iter_ =
max_iter / 4; // SIMD_SZ == 4 (returning value of pffft_simd_size()) max_iter / 4;
if (max_iter_ == 0) max_iter_ = 1; if (max_iter_ == 0) max_iter_ = 1;
if (cplx) { if (cplx) {
api.cffti(N, wrk_.PtrBoth()).IgnoreError(); api.cffti(N, wrk_.PtrBoth()).IgnoreError();
@ -145,7 +158,9 @@ int main(int argc, char* argv[]) {
show_output("FFTPack", N, cplx, flops, t0, t1, max_iter_); show_output("FFTPack", N, cplx, flops, t0, t1, max_iter_);
} }
// PFFFT benchmark /*
* PFFFT benchmark
*/
{ {
sapi::StatusOr<PFFFT_Setup*> s = sapi::StatusOr<PFFFT_Setup*> s =
api.pffft_new_setup(N, cplx ? PFFFT_COMPLEX : PFFFT_REAL); api.pffft_new_setup(N, cplx ? PFFFT_COMPLEX : PFFFT_REAL);