1 /* 2 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp. 3 * Licensed under GPLv2. 4 */ 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <sys/mman.h> 9 #include <time.h> 10 11 #include "utils.h" 12 13 #define ITERATIONS 5000000 14 15 #define MEMSIZE (128 * 1024 * 1024) 16 17 int test_mmap(void) 18 { 19 struct timespec ts_start, ts_end; 20 unsigned long i = ITERATIONS; 21 22 clock_gettime(CLOCK_MONOTONIC, &ts_start); 23 24 while (i--) { 25 char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE, 26 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); 27 FAIL_IF(c == MAP_FAILED); 28 munmap(c, MEMSIZE); 29 } 30 31 clock_gettime(CLOCK_MONOTONIC, &ts_end); 32 33 printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9); 34 35 return 0; 36 } 37 38 int main(void) 39 { 40 return test_harness(test_mmap, "mmap_bench"); 41 } 42