22 lines
544 B
C
22 lines
544 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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int main() {
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struct timespec t1, t2;
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void* buf = malloc(2 * 1024 * 1024);
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clock_gettime(CLOCK_MONOTONIC, &t1);
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memset(buf, 0xEF, 2 * 1024 * 1024);
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clock_gettime(CLOCK_MONOTONIC, &t2);
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double ms = (t2.tv_sec - t1.tv_sec) * 1000.0 + (t2.tv_nsec - t1.tv_nsec) / 1000000.0;
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printf("memset time: %.3f ms\n", ms);
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printf("First byte: 0x%02x (should be 0xEF)\n", ((unsigned char*)buf)[0]);
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free(buf);
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return 0;
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}
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