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/*
* Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <time.h>
#include <getopt.h>
#include "utils.h"
#define ITERATIONS 5000000
#define MEMSIZE (1UL << 27)
#define PAGE_SIZE (1UL << 16)
#define CHUNK_COUNT (MEMSIZE/PAGE_SIZE)
static int pg_fault;
static int iterations = ITERATIONS;
static struct option options[] = {
{ "pgfault", no_argument, &pg_fault, 1 },
{ "iterations", required_argument, 0, 'i' },
{ 0, },
};
static void usage(void)
{
printf("mmap_bench <--pgfault> <--iterations count>\n");
}
int test_mmap(void)
{
struct timespec ts_start, ts_end;
unsigned long i = iterations;
clock_gettime(CLOCK_MONOTONIC, &ts_start);
while (i--) {
char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
FAIL_IF(c == MAP_FAILED);
if (pg_fault) {
int count;
for (count = 0; count < CHUNK_COUNT; count++)
c[count << 16] = 'c';
}
munmap(c, MEMSIZE);
}
clock_gettime(CLOCK_MONOTONIC, &ts_end);
printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
return 0;
}
int main(int argc, char *argv[])
{
signed char c;
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "", options, &option_index);
if (c == -1)
break;
switch (c) {
case 0:
if (options[option_index].flag != 0)
break;
usage();
exit(1);
break;
case 'i':
iterations = atoi(optarg);
break;
default:
usage();
exit(1);
}
}
return test_harness(test_mmap, "mmap_bench");
}
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