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 <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;
}
An ArrayFire exception class.
Definition: exception.h:22
virtual const char * what() const
Returns an error message for the exception in a string format.
Definition: exception.h:46
AFAPI void info()
AFAPI void setDevice(const int device)
Sets the current device.
static af::array array(af::dim4 idims, cl_mem buf, af::dtype type, bool retain=false)
Create an af::array object from an OpenCL cl_mem buffer.
Definition: opencl.h:327
AFAPI array randu(const dim4 &dims, const dtype ty, randomEngine &r)
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.
Definition: algorithm.h:15
AFAPI double timeit(void(*fn)())