36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
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#include <stdio.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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enum {SIZE=2001};
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struct timespec tstart, tstop;
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int a[SIZE];//{1,2,…,1000,12345,1,2,…,1000};
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int main(void)
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{
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struct rusage usage;
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struct timeval startu, endu, starts, ends;
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int same = 0;
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for(int i=0;i<=1000;i++)
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a[i] = i,a[i+1001]=i;
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a[1000]=12345;
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getrusage(RUSAGE_SELF, &usage);
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// измерение в режиме пользователя
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startu = usage.ru_utime;
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// измерение в режиме системы
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starts = usage.ru_stime;
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same = 0;
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for (size_t i=0; i<SIZE; i++)
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same ^= a[i];
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getrusage(RUSAGE_SELF, &usage);
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endu = usage.ru_utime;
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ends = usage.ru_stime;
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printf("Started at user mode: %ld.%d\n", startu.tv_sec, startu.tv_usec);
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printf("Ended at user mode: %ld.%d\n", endu.tv_sec, endu.tv_usec);
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printf("Started at system mode: %ld.%d\n", starts.tv_sec, starts.tv_usec);
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printf("Ended at system mode: %ld.%d\n", ends.tv_sec, ends.tv_usec);
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return 0;
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}
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