C++实现获取指定代码段的cpu占用

2023-12-28 10:24:52 作者：BuffaloX_X

这篇文章主要为大家详细介绍了C++实现获取指定代码段的cpu占用的相关知识,文中的示例代码讲解详细,具有一定的借鉴价值,有需要的小伙伴可以参考一下

windows

#include <iostream>
#include <windows.h>
#include <vector>
 
class CodeSegmentCPUMonitor {
public:
    static CodeSegmentCPUMonitor& getInstance() {
        static CodeSegmentCPUMonitor instance;
        return instance;
    }
 
    ~CodeSegmentCPUMonitor() {
        // 获取结束性能计数器值
        QueryPerformanceCounter(&endCounter);
 
        // 计算运行时间（秒）
        double elapsedTime = static_cast<double>(endCounter.QuadPart - startCounter.QuadPart) / frequency.QuadPart;
 
        // 计算 CPU 平均占用
        double averageCPUUsage = (totalCycles / elapsedTime) * 100.0 / processorSpeed;
 
        std::cout << "Total Average CPU Usage: " << averageCPUUsage << "%\n";
    }
 
    void enterCodeSegment() {
        // 进入代码段时记录开始时间
        QueryPerformanceCounter(&codeSegmentStartCounter);
    }
 
    void exitCodeSegment() {
        // 退出代码段时记录结束时间
        QueryPerformanceCounter(&codeSegmentEndCounter);
 
        // 计算代码段的 CPU 占用
        ULONGLONG codeSegmentCycles = codeSegmentEndCounter.QuadPart - codeSegmentStartCounter.QuadPart;
        totalCycles += codeSegmentCycles;
    }
 
private:
    LARGE_INTEGER frequency;
    LARGE_INTEGER startCounter;
    LARGE_INTEGER endCounter;
 
    LARGE_INTEGER codeSegmentStartCounter;
    LARGE_INTEGER codeSegmentEndCounter;
 
    ULONGLONG totalCycles = 0;
 
    // 假设处理器速度为 2.5 GHz，你需要根据实际情况调整这个值
    const double processorSpeed = 2.5e9;
 
    CodeSegmentCPUMonitor() {
        // 获取性能计数器频率
        if (QueryPerformanceFrequency(&frequency)) {
            // 获取初始性能计数器值
            QueryPerformanceCounter(&startCounter);
        } else {
            std::cerr << "Failed to get performance counter frequency.\n";
        }
    }
 
    // 禁用拷贝构造函数和赋值运算符
    CodeSegmentCPUMonitor(const CodeSegmentCPUMonitor&) = delete;
    CodeSegmentCPUMonitor& operator=(const CodeSegmentCPUMonitor&) = delete;
};
 
int main() {
    // Example: Measure CPU usage for code segment 1
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 1 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // Example: Measure CPU usage for code segment 2
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 2 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // ... Add more code segments as needed ...
 
    return 0;
}

linux

#include <iostream>
#include <vector>
#include <ctime>
 
class CodeSegmentCPUMonitor {
public:
    static CodeSegmentCPUMonitor& getInstance() {
        static CodeSegmentCPUMonitor instance;
        return instance;
    }
 
    ~CodeSegmentCPUMonitor() {
        // 获取结束时间
        struct timespec endTime;
        clock_gettime(CLOCK_MONOTONIC, &endTime);
 
        // 计算运行时间（秒）
        double elapsedTime = static_cast<double>(endTime.tv_sec - startTime.tv_sec) +
                             static_cast<double>(endTime.tv_nsec - startTime.tv_nsec) / 1e9;
 
        // 计算 CPU 平均占用
        double averageCPUUsage = (totalCycles / elapsedTime) * 100.0 / processorSpeed;
 
        std::cout << "Total Average CPU Usage: " << averageCPUUsage << "%\n";
    }
 
    void enterCodeSegment() {
        // 进入代码段时记录开始时间
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentStartTime);
    }
 
    void exitCodeSegment() {
        // 退出代码段时记录结束时间
        struct timespec codeSegmentEndTime;
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentEndTime);
 
        // 计算代码段的 CPU 占用
        double codeSegmentElapsedTime = static_cast<double>(codeSegmentEndTime.tv_sec - codeSegmentStartTime.tv_sec) +
                                        static_cast<double>(codeSegmentEndTime.tv_nsec - codeSegmentStartTime.tv_nsec) / 1e9;
        totalCycles += codeSegmentElapsedTime;
    }
 
private:
    struct timespec startTime;
    struct timespec codeSegmentStartTime;
 
    double totalCycles = 0;
 
    // 假设处理器速度为 2.5 GHz，你需要根据实际情况调整这个值
    const double processorSpeed = 2.5e9;
 
    CodeSegmentCPUMonitor() {
        // 获取初始时间
        clock_gettime(CLOCK_MONOTONIC, &startTime);
    }
 
    // 禁用拷贝构造函数和赋值运算符
    CodeSegmentCPUMonitor(const CodeSegmentCPUMonitor&) = delete;
    CodeSegmentCPUMonitor& operator=(const CodeSegmentCPUMonitor&) = delete;
};
 
int main() {
    // Example: Measure CPU usage for code segment 1
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 1 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // Example: Measure CPU usage for code segment 2
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 2 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // ... Add more code segments as needed ...
 
    return 0;
}

linux和windows条件编译

#include <iostream>
 
#ifdef _WIN32
#include <windows.h>
#else
#include <ctime>
#endif
 
class CodeSegmentCPUMonitor {
public:
    static CodeSegmentCPUMonitor& getInstance() {
        static CodeSegmentCPUMonitor instance;
        return instance;
    }
 
    ~CodeSegmentCPUMonitor() {
#ifdef _WIN32
        FILETIME endTime;
        GetSystemTimeAsFileTime(&endTime);
        ULARGE_INTEGER endTime64;
        endTime64.LowPart = endTime.dwLowDateTime;
        endTime64.HighPart = endTime.dwHighDateTime;
        double elapsedTime = static_cast<double>(endTime64.QuadPart - startTime.QuadPart) / frequency.QuadPart;
#else
        struct timespec endTime;
        clock_gettime(CLOCK_MONOTONIC, &endTime);
        double elapsedTime = static_cast<double>(endTime.tv_sec - startTime.tv_sec) +
                             static_cast<double>(endTime.tv_nsec - startTime.tv_nsec) / 1e9;
#endif
 
        double averageCPUUsage = (totalCycles / elapsedTime) * 100.0 / processorSpeed;
 
        std::cout << "Total Average CPU Usage: " << averageCPUUsage << "%\n";
    }
 
    void enterCodeSegment() {
#ifdef _WIN32
        GetSystemTimeAsFileTime(&codeSegmentStartTime);
#else
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentStartTime);
#endif
    }
 
    void exitCodeSegment() {
#ifdef _WIN32
        FILETIME codeSegmentEndTime;
        GetSystemTimeAsFileTime(&codeSegmentEndTime);
        ULARGE_INTEGER codeSegmentEndTime64;
        codeSegmentEndTime64.LowPart = codeSegmentEndTime.dwLowDateTime;
        codeSegmentEndTime64.HighPart = codeSegmentEndTime.dwHighDateTime;
        double codeSegmentElapsedTime = static_cast<double>(codeSegmentEndTime64.QuadPart - codeSegmentStartTime.QuadPart) / frequency.QuadPart;
#else
        struct timespec codeSegmentEndTime;
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentEndTime);
        double codeSegmentElapsedTime = static_cast<double>(codeSegmentEndTime.tv_sec - codeSegmentStartTime.tv_sec) +
                                        static_cast<double>(codeSegmentEndTime.tv_nsec - codeSegmentStartTime.tv_nsec) / 1e9;
#endif
 
        totalCycles += codeSegmentElapsedTime;
    }
 
private:
#ifdef _WIN32
    LARGE_INTEGER frequency;
    LARGE_INTEGER startTime;
    FILETIME codeSegmentStartTime;
#else
    struct timespec startTime;
    struct timespec codeSegmentStartTime;
#endif
 
    double totalCycles = 0;
    const double processorSpeed = 2.5e9;
 
    CodeSegmentCPUMonitor() {
#ifdef _WIN32
        QueryPerformanceFrequency(&frequency);
        QueryPerformanceCounter(&startTime);
#else
        clock_gettime(CLOCK_MONOTONIC, &startTime);
#endif
    }
 
    CodeSegmentCPUMonitor(const CodeSegmentCPUMonitor&) = delete;
    CodeSegmentCPUMonitor& operator=(const CodeSegmentCPUMonitor&) = delete;
};
 
int main() {
    // Example: Measure CPU usage for code segment 1
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 1 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // Example: Measure CPU usage for code segment 2
    {
        CodeSegmentCPUMonitor::getInstance().enterCodeSegment();
 
        // Your code segment 2 here
 
        CodeSegmentCPUMonitor::getInstance().exitCodeSegment();
    }
 
    // ... Add more code segments as needed ...
 
    return 0;
}

解耦log接口的形式1

#include <iostream>
#include <string>
 
// CPU Monitor Output Interface
class CPUMonitorOutputInterface {
public:
    virtual ~CPUMonitorOutputInterface() {}
    virtual void log(const std::string& message) = 0;
};
 
// ConsoleLogger: 实现CPUMonitorOutputInterface的一个Logger类示例
class ConsoleLogger : public CPUMonitorOutputInterface {
public:
    void log(const std::string& message) override {
        std::cout << "Logger: " << message << std::endl;
    }
};
 
class CodeSegmentCPUMonitor {
public:
    CodeSegmentCPUMonitor(CPUMonitorOutputInterface& logger) : logger(logger) {
#ifdef _WIN32
        QueryPerformanceFrequency(&frequency);
        QueryPerformanceCounter(&startTime);
#else
        clock_gettime(CLOCK_MONOTONIC, &startTime);
#endif
    }
 
    ~CodeSegmentCPUMonitor() {
#ifdef _WIN32
        FILETIME endTime;
        GetSystemTimeAsFileTime(&endTime);
        ULARGE_INTEGER endTime64;
        endTime64.LowPart = endTime.dwLowDateTime;
        endTime64.HighPart = endTime.dwHighDateTime;
        double elapsedTime = static_cast<double>(endTime64.QuadPart - startTime.QuadPart) / frequency.QuadPart;
#else
        struct timespec endTime;
        clock_gettime(CLOCK_MONOTONIC, &endTime);
        double elapsedTime = static_cast<double>(endTime.tv_sec - startTime.tv_sec) +
                             static_cast<double>(endTime.tv_nsec - startTime.tv_nsec) / 1e9;
#endif
 
        double averageCPUUsage = (totalCycles / elapsedTime) * 100.0 / processorSpeed;
        logger.log("Total Average CPU Usage: " + std::to_string(averageCPUUsage) + "%");
    }
 
    void enterCodeSegment() {
#ifdef _WIN32
        GetSystemTimeAsFileTime(&codeSegmentStartTime);
#else
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentStartTime);
#endif
    }
 
    void exitCodeSegment() {
#ifdef _WIN32
        FILETIME codeSegmentEndTime;
        GetSystemTimeAsFileTime(&codeSegmentEndTime);
        ULARGE_INTEGER codeSegmentEndTime64;
        codeSegmentEndTime64.LowPart = codeSegmentEndTime.dwLowDateTime;
        codeSegmentEndTime64.HighPart = codeSegmentEndTime.dwHighDateTime;
        double codeSegmentElapsedTime = static_cast<double>(codeSegmentEndTime64.QuadPart - codeSegmentStartTime.QuadPart) / frequency.QuadPart;
#else
        struct timespec codeSegmentEndTime;
        clock_gettime(CLOCK_MONOTONIC, &codeSegmentEndTime);
        double codeSegmentElapsedTime = static_cast<double>(codeSegmentEndTime.tv_sec - codeSegmentStartTime.tv_sec) +
                                        static_cast<double>(codeSegmentEndTime.tv_nsec - codeSegmentStartTime.tv_nsec) / 1e9;
#endif
 
        totalCycles += codeSegmentElapsedTime;
    }
 
private:
    CPUMonitorOutputInterface& logger;
 
#ifdef _WIN32
    LARGE_INTEGER frequency;
    LARGE_INTEGER startTime;
    FILETIME codeSegmentStartTime;
#else
    struct timespec startTime;
    struct timespec codeSegmentStartTime;
#endif
 
    double totalCycles = 0;
    const double processorSpeed = 2.5e9;
};
 
int main() {
    // Example: Measure CPU usage for code segment 1 with ConsoleLogger
    {
        ConsoleLogger consoleLogger;
        CodeSegmentCPUMonitor monitor(consoleLogger);
        monitor.enterCodeSegment();
 
        // Your code segment 1 here
 
        monitor.exitCodeSegment();
    }
 
    // Example: Measure CPU usage for code segment 2 with ConsoleLogger
    {
        ConsoleLogger consoleLogger;
        CodeSegmentCPUMonitor monitor(consoleLogger);
        monitor.enterCodeSegment();
 
        // Your code segment 2 here
 
        monitor.exitCodeSegment();
    }
 
    // ... Add more code segments as needed ...
 
    return 0;
}

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C++实现获取指定代码段的cpu占用

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