benchmarks/fft.cpp

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benchmarks/fft.cpp
/*******************************************************
* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <arrayfire.h>
#include <stdio.h>
#include <math.h>
#include <cstdlib>
using namespace af;
// create a small wrapper to benchmark
static array A; // populated before each timing
static void fn()
{
array B = fft2(A); // matrix multiply
B. eval(); // ensure evaluated
}
int main(int argc, char ** argv)
{
try {
int device = argc > 1 ? atoi(argv[1]) : 0;
setDevice(device);
info();
printf("Benchmark N-by-N 2D fft\n");
for (int M = 7; M <= 12; M++) {
int N = (1 << M);
printf("%4d x %4d: ", N, N);
A = randu(N,N);
double time = timeit(fn); // time in seconds
double gflops = 10.0 * N * N * M / (time * 1e9);
printf(" %4.0f Gflops\n", gflops);
fflush(stdout);
}
} catch (af::exception& e) {
fprintf(stderr, "%s\n", e. what());
}
#ifdef WIN32 // pause in Windows
if (!(argc == 2 && argv[1][0] == '-')) {
printf("hit [enter]...");
fflush(stdout);
getchar();
}
#endif
return 0;
}