qt+Linux+arm多核CPU 亲和性

qq_243309112024-12-31 23:15

#include <QCoreApplication>
#include <QThread>
#include <pthread.h>
#include <sched.h>
#include <iostream>

void setThreadAffinity(int coreId) {
    cpu_set_t cpuset;
    CPU_ZERO(&cpuset);
    CPU_SET(coreId, &cpuset);// 设置线程执行在cpu编号为cpu的核上

    // 获取当前线程ID
    pthread_t thread = pthread_self();
    // 设置当前线程的亲和性
    int result = pthread_setaffinity_np(thread, sizeof(cpu_set_t), &cpuset);
    if (result != 0) {
        qWarning() << "Failed to set thread affinity, error code:" << result;
    } else {
        qDebug() << "Thread successfully bound to CPU" << cpu;
    }
}

class WorkerThread : public QThread {
public:
    void run() override {
        setThreadAffinity(1);  // 绑定到 CPU 核心 1
        std::cout << "Thread is running on core 1" << std::endl;
        // 模拟一些工作
        for (int i = 0; i < 1000000; ++i);
    }
};

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);

    WorkerThread worker;
    worker.start();

    return a.exec();
}

目前大部分的CPU都支持多核，QT的主线程默认运行在第一个CPU的核心中，当执行复杂而耗时的任务是，程序界面有可能会出现卡顿，而其它的核心又没用到，白白浪费了资源。

qt的QThead类本身是没有设置cpu亲和性的接口的，需要自己封装一个接口将QT线程运行到指定的cpu核心中。

前提是要确定cpu是支持多核的