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42 lines
764 B
42 lines
764 B
6 years ago
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#include <litc.h>
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static long
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nowms(void)
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{
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struct timeval tv;
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if (gettimeofday(&tv, NULL))
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errx(-1, "nowms");
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return tv.tv_sec*1000 + tv.tv_usec/1000;
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}
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#define SZ (1 << 22)
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#define N 1024
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int main(int argc, char **argv)
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{
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printf("mmapbench\n");
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const size_t sz = SZ;
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long tot = 0;
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for (int i = 0 ; i < N; i++) {
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char *p = mmap(NULL, sz, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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if (p == MAP_FAILED)
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errx(-1, "mmap failed");
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long st = nowms();
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for (int j = 0; j < sz; j += 4096) {
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p[j] = 0xcc;
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}
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tot += nowms() - st;
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if (munmap(p, sz) != 0)
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errx(-1, "munmap failed");
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}
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printf("mmapbench %ld pgfaults in %ld ms\n", (long) (SZ/4096) * N, tot);
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return 0;
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}
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