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:
* https://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <arrayfire.h>
#include <math.h>
#include <stdio.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()); }
return 0;
}
af::info
AFAPI void info()
af::fft2
AFAPI array fft2(const array &in, const dim_t odim0=0, const dim_t odim1=0)
C++ Interface for fast fourier transform on two dimensional signals.
af::setDevice
AFAPI void setDevice(const int device)
Sets the current device.
af::array
A multi dimensional data container.
Definition: array.h:35
af
Definition: algorithm.h:15
af::timeit
AFAPI double timeit(void(*fn)())
af::array::eval
void eval() const
Evaluate any JIT expressions to generate data for the array.
af::randu
AFAPI array randu(const dim4 &dims, const dtype ty, randomEngine &r)
af::exception
An ArrayFire exception class.
Definition: exception.h:29
arrayfire.h
af::exception::what
virtual const char * what() const
Returns an error message for the exception in a string format.
Definition: exception.h:60