lib/magma/tests/benchmark/test_memcpy.cc

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <chrono>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void* a;
void* b;
uint64_t buffer_size;
uint64_t iterations;

void loop()
{
    for (uint64_t iter = 0; iter < iterations; iter++) {
        memcpy(b, a, buffer_size);
    }
}

int main(int argc, char** argv)
{
    buffer_size = 60 * 1024 * 1024;
    iterations = 1000;

    a = malloc(buffer_size);
    b = malloc(buffer_size);

    memset(a, 0, buffer_size);
    memset(b, 0, buffer_size);

    auto start = std::chrono::high_resolution_clock::now();

    loop();

    free(a);
    free(b);

    std::chrono::duration<double> elapsed = std::chrono::high_resolution_clock::now() - start;
    printf("buffer_size %lu iterations %lu copy rate %.2f MB/s\n", buffer_size, iterations,
           (double)buffer_size * iterations / 1024 / 1024 / elapsed.count());

    return 0;
}