37 lines
768 B
C
37 lines
768 B
C
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/time.h>
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unsigned long long tv_to_ms(struct timeval tv)
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{
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return tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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void main()
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{
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struct timeval tv_b, tv_e;;
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#define SIZE 400*1024*1024
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void *p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (!p) {
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perror("fail to get memory");
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exit(-1);
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}
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madvise(p, SIZE, MADV_HUGEPAGE);
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memset(p, 0x11, SIZE); /* write to get mem */
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gettimeofday(&tv_b, NULL);
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madvise(p, SIZE, MADV_PAGEOUT);
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gettimeofday(&tv_e, NULL);
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printf("swp out bandwidth: %ld bytes/ms\n",
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SIZE/(tv_to_ms(tv_e) - tv_to_ms(tv_b)));
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}
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