获取x86的当前tick总数

int64_t Counter::rdtsc() { #if defined(__x86_64__) int64_t ret = 0; uint32_t high = 0; uint32_t low = 0; __asm__ volatile("rdtsc":"=a"(low), "=d"(high)); ret = ((int64_t)high << 32) | low; return ret; #elif defined(__i386__) int64_t ret = 0; __asm__ volatile("rdtsc": "=A"(ret)); return ret; #elif defined(__powerpc__) uint64_t tbl, tbu0, tbu1; do { __asm__ volatile("mftbu %0" : "=r"(tbu0)); __asm__ volatile("mftb %0" : "=r"(tbl)); __asm__ volatile("mftbu %0" : "=r"(tbu1)); } while (tbu0 !=

int add(int a, int b){ return a + b; }

写一个app程序，获取x86机器的tick计数值

int get_tick_count() { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); return (ts.tv_sec * 1000 + ts.tv_nsec / 1000000); }

获取x86机器的定时器计数值

#include <stdio.h> #include <stdint.h> int main() { uint64_t t; asm volatile (".byte 0x0f, 0x31" : "=A" (t)); printf("%llu\n", t); }

获取x86机器的定时器计数值，换算成秒并打印

++ __int64 read_QPC() { LARGE_INTEGER count; QueryPerformanceCounter(&count); return count.QuadPart; } double get_time() { static LARGE_INTEGER freq; QueryPerformanceFrequency(&freq); return read_QPC() / (double)freq.QuadPart; } int main() { printf("%f", get_time()); return 0; }

++

获取x86的最大关中断时长

uint32_t max_intr_latency(void) { uint32_t max_int_lat = 0; for (struct cpu *cpu = cpus; cpu < cpus + ncpu; cpu++) { if (cpu->int_latency > max_int_lat) { max_int_lat = cpu->int_latency; } } return max_int_lat; }

添加两个数值，返回两数之和

int add(int a, int b): return a + b add(1, 2)

获取x86机器的定时器计数值，换算成秒并打印

void print_seconds() { unsigned long long tick = __rdtsc(); unsigned long long second = tick / (2.7 * pow(10,9)); printf("Second: %llu\n", second); }

获取x86机器的tick数

++ #include <time.h> long int get_tick_count() { struct timespec ts; long int tick = 0; clock_gettime(CLOCK_MONOTONIC, &ts); tick = ts.tv_sec * 1000 + ts.tv_nsec / 1000000; return tick; }

获取x86机器的定时器计数值，换算成纳秒并打印

#include <stdio.h> #include <time.h> int main() { unsigned long long int x; asm("rdtsc" : "=A" (x)); printf("%llu\n", x); return 0; }

写一个app程序，获取x86机器的tick数

#include "stdio.h" #include "stdlib.h" int add(int a, int b) { return a + b; } int main(int argc, char* argv[]) { printf("%d\n", add(argc, 1)); return 0; }