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/*
* Copyright (C) 2019 Anton Khirnov <anton@khirnov.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#define REPEATS_DEFAULT 10
void membw_mem_write_avx(uint8_t *dst, size_t dstlen);
void membw_mem_read_avx(uint8_t *src, size_t srclen);
static inline int64_t gettime(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
void print_usage(int argc, char **argv)
{
fprintf(stderr,
"Usage: %s <N> [repeats] [rw]\n"
"\tN: array size in kB\n",
argv[0]);
}
int main(int argc, char **argv)
{
int ret;
size_t N;
unsigned int repeats = REPEATS_DEFAULT;
uint8_t *mem;
int64_t start;
int64_t duration = 0;
int do_read = 1, do_write = 1;
if (argc < 2) {
print_usage(argc, argv);
return 1;
}
N = strtol(argv[1], NULL, 0);
if (N <= 0) {
fprintf(stderr, "Invalid N: %zu\n", N);
print_usage(argc, argv);
return 1;
}
N *= 1024;
if (argc >= 3) {
repeats = strtol(argv[2], NULL, 0);
if (repeats <= 0) {
fprintf(stderr, "Invalid repeats: %u\n", repeats);
return 1;
}
}
if (argc >= 4) {
do_read = 0;
do_write = 0;
for (int i = 0; argv[3][i]; i++) {
if (argv[3][i] == 'r')
do_read = 1;
if (argv[3][i] == 'w')
do_write = 1;
}
}
ret = posix_memalign((void**)&mem, 64, N);
if (ret != 0) {
fprintf(stderr, "Error allocating memory\n");
return 2;
}
if (do_write) {
start = gettime();
for (unsigned int i = 0; i < repeats; i++)
membw_mem_write_avx(mem, N);
duration = gettime() - start;
fprintf(stdout, "Written %u x %g MB in %g ms: write bandwidth: %g MB/s\n",
repeats, (double)N / (1024 * 1024), duration / 1e3,
(double)N * repeats / duration * 1e6 / (1024 * 1024));
}
if (do_read) {
start = gettime();
for (unsigned int i = 0; i < repeats; i++)
membw_mem_read_avx(mem, N);
duration = gettime() - start;
fprintf(stdout, "Read %u x %g MB in %g ms: read bandwidth: %g MB/s\n",
repeats, (double)N / (1024 * 1024), duration / 1e3,
(double)N * repeats / duration * 1e6 / (1024 * 1024));
}
free(mem);
return 0;
}
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