91 lines
1.6 KiB
C
91 lines
1.6 KiB
C
/*
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* Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <time.h>
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#include <getopt.h>
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#include "utils.h"
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#define ITERATIONS 5000000
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#define MEMSIZE (1UL << 27)
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#define PAGE_SIZE (1UL << 16)
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#define CHUNK_COUNT (MEMSIZE/PAGE_SIZE)
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static int pg_fault;
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static int iterations = ITERATIONS;
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static struct option options[] = {
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{ "pgfault", no_argument, &pg_fault, 1 },
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{ "iterations", required_argument, 0, 'i' },
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{ 0, },
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};
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static void usage(void)
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{
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printf("mmap_bench <--pgfault> <--iterations count>\n");
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}
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int test_mmap(void)
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{
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struct timespec ts_start, ts_end;
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unsigned long i = iterations;
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clock_gettime(CLOCK_MONOTONIC, &ts_start);
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while (i--) {
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char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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FAIL_IF(c == MAP_FAILED);
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if (pg_fault) {
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int count;
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for (count = 0; count < CHUNK_COUNT; count++)
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c[count << 16] = 'c';
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}
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munmap(c, MEMSIZE);
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}
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clock_gettime(CLOCK_MONOTONIC, &ts_end);
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printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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signed char c;
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while (1) {
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int option_index = 0;
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c = getopt_long(argc, argv, "", options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 0:
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if (options[option_index].flag != 0)
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break;
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usage();
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exit(1);
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break;
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case 'i':
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iterations = atoi(optarg);
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break;
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default:
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usage();
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exit(1);
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}
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}
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test_harness_set_timeout(300);
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return test_harness(test_mmap, "mmap_bench");
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}
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