测试CPU品牌和当前工作频率
这里有一段非常简单的代码，取自网络，我稍加修改，贴在这里。用来检查CPU的生产商和品牌，以及当前工作频率，如果是台式机CPU，频率应该恒定，但是移动版本的CPU，频率不停地在变。以下代码用Visual C++编译，因为内嵌一点汇编，造成移植性变差(例如：GCC汇编跟AT&T汇编语法类似，但是MS汇编跟Intel汇编语法类似)，以下代码如果希望在MinGW(GCC)下编译，需要修改那点内嵌的汇编。
#include "stdafx.h" #ifndef CPUID_HPP_ #define CPUID_HPP_ #include <string> #include <cstring> #include <iostream> #include <windows.h> typedef unsigned long DWORD; typedef __int64 LONGLONG; class CPUID { public: CPUID() : m_eax(0), m_ebx(0), m_ecx(0), m_edx(0){} std::string vendor(); //哪个厂商出的？Intel, AMD, VIA ? std::string name(); //这是CPU的整体描述 LONGLONG frequency(DWORD stime = 1000);//CPU的当前工作频率 private: void Executecpuid(DWORD veax); LONGLONG cycles() const { DWORD h, l; //不能直接读取，用变量过渡一下 __asm { rdtsc //把当前CPU周期读入寄存器 mov l, eax mov h, edx } LONGLONG high = h, low = l; return high << 32 | low; } DWORD m_eax; DWORD m_ebx; DWORD m_ecx; DWORD m_edx; }; void CPUID::Executecpuid(DWORD veax) { DWORD deax; DWORD debx; DWORD decx; DWORD dedx; __asm { mov eax, veax cpuid mov deax, eax mov debx, ebx mov decx, ecx mov dedx, edx } m_eax = deax; m_ebx = debx; m_ecx = decx; m_edx = dedx; } std::string CPUID::vendor() { const DWORD S = sizeof(DWORD); char cVID[S*3+1]; std::memset(cVID, 0, sizeof(cVID)); Executecpuid(0); std::memcpy(cVID+S*0, &m_ebx, S); std::memcpy(cVID+S*1, &m_edx, S); std::memcpy(cVID+S*2, &m_ecx, S); return std::string(cVID); } std::string CPUID::name() { const DWORD vendorID = 0x80000002; const DWORD S = sizeof(DWORD); char cvendor[S*4*3+1]; std::memset(cvendor, 0, sizeof(cvendor)); for(DWORD i = 0; i < 3; i++) { Executecpuid(vendorID + i); // 每次执行结束后，保存四个寄存器里的ascii码到数组 std::memcpy(cvendor + i*S*4 + S*0, &m_eax, S); std::memcpy(cvendor + i*S*4 + S*1, &m_ebx, S); std::memcpy(cvendor + i*S*4 + S*2, &m_ecx, S); std::memcpy(cvendor + i*S*4 + S*3, &m_edx, S); } return std::string(cvendor); } LONGLONG CPUID::frequency(DWORD stime) { HANDLE hp = GetCurrentProcess(); HANDLE ht = GetCurrentThread(); DWORD pc = GetPriorityClass(hp); DWORD tp = GetThreadPriority(ht); BOOL flag1 = FALSE, flag2 = FALSE; flag1 = SetPriorityClass(hp, REALTIME_PRIORITY_CLASS); //优先级设置最高 flag2 = SetThreadPriority(ht, THREAD_PRIORITY_HIGHEST);//优先级设置最高 //由于CPU本身时间波动较大，因此时间从系统读取，这样比较平均 //周期除以时间就是工作频率，即单位时间内的周期 Sleep(stime); LARGE_INTEGER fq, st, ed; QueryPerformanceFrequency(&fq); QueryPerformanceCounter(&st); LONGLONG start = cycles(); Sleep(stime); QueryPerformanceCounter(&ed); LONGLONG end = cycles(); if(flag1) SetPriorityClass(hp, pc); if(flag2) SetThreadPriority(ht, tp); CloseHandle(hp); CloseHandle(ht); return (end - start) * fq.QuadPart / (ed.QuadPart - st.QuadPart); } #endif #include <cstdio> #include <cstdlib> int main() { CPUID cpu; std::printf("Vendor: %s/n", cpu.vendor().c_str()); std::printf("Full name: %s/n", cpu.name().c_str()); const unsigned TIMES = 3; std::printf("Frequency(testing %d times): ", TIMES); const double UNIT = 1000.0; for(unsigned i = 0; i < TIMES; ++i) { double fre = cpu.frequency() / UNIT; // 假设CPU主频高于1000Hz if(fre > UNIT) fre /= UNIT; std::printf("%f%s ", fre, (fre > 10.0 ? "MHz" : "GHz")); } printf("/n"); std::system("PAUSE"); return 0; }