benchmarks/blas.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 = matmul(A, A); // matrix multiply
B.eval(); // ensure evaluated
}
int main(int argc, char ** argv)
{
double peak = 0;
try {
int device = argc > 1 ? atoi(argv[1]) : 0;
setDevice(device);
info();
printf("Benchmark N-by-N matrix multiply\n");
for (int n = 128; n <= 2048; n += 128) {
printf("%4d x %4d: ", n, n);
A = constant(1,n,n);
double time = timeit(fn); // time in seconds
double gflops = 2.0 * powf(n,3) / (time * 1e9);
if (gflops > peak)
peak = gflops;
printf(" %4.0f Gflops\n", gflops);
fflush(stdout);
}
} catch (af::exception& e) {
fprintf(stderr, "%s\n", e.what());
throw;
}
printf(" ### peak %g GFLOPS\n", peak);
return 0;
}