104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
#include <stdint.h>
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#include <unistd.h>
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "topo.h"
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#define S2NS (1000000000UL)
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static inline uint64_t
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get_uptime()
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{
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struct timespec tp;
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clock_gettime(CLOCK_MONOTONIC, &tp);
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return ((uint64_t)tp.tv_sec * S2NS + (uint64_t)tp.tv_nsec);
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}
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void test(const char * case_name, struct timespec * ts)
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{
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uint64_t slow;
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uint64_t fast;
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slow = get_uptime();
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if (nanosleep(ts, NULL) != 0) {
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perror("nanosleep() interrupted!");
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exit(-1);
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}
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slow = get_uptime() - slow;
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fast = topo_uptime_ns();
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if (nanosleep(ts, NULL) != 0) {
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perror("nanosleep() interrupted!");
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exit(-1);
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}
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fast = topo_uptime_ns() - fast;
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printf("%s: clock_gettime(): %lu, topo_uptime_ns(): %lu, %% diff: %.2f%%\n", case_name, slow, fast, ((float)fast - (float)slow) / (float)slow * 100);
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}
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int ts_test()
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{
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struct timespec ts;
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// 1s
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ts.tv_nsec = 0;
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ts.tv_sec = 1;
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test("1s", &ts);
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// 100ms
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ts.tv_nsec = 100000000;
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ts.tv_sec = 0;
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test("100ms", &ts);
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// 10ms
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ts.tv_nsec = 10000000;
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ts.tv_sec = 0;
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test("10ms", &ts);
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// 1ms
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ts.tv_nsec = 1000000;
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ts.tv_sec = 0;
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test("1ms", &ts);
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// 100us
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ts.tv_nsec = 100000;
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ts.tv_sec = 0;
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test("100us", &ts);
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// 10us
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ts.tv_nsec = 10000;
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ts.tv_sec = 0;
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test("10us", &ts);
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// 1us
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ts.tv_nsec = 1000;
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ts.tv_sec = 0;
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test("1us", &ts);
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// 100ns
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ts.tv_nsec = 100;
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ts.tv_sec = 0;
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test("100ns", &ts);
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// 10ns
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ts.tv_nsec = 10;
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ts.tv_sec = 0;
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test("10ns", &ts);
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// 1ns
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ts.tv_nsec = 1;
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ts.tv_sec = 0;
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test("1ns", &ts);
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return 0;
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}
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int main()
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{
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topo_init(1);
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topo_init(1);
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ts_test();
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return 0;
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}
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