Qt OpenMP并行程序

在Qt的pro文件中加入：

QMAKE_CXXFLAGS += -fopenmp

LIBS += -lgomp -lpthread

我简单测了一下,单线程执行N次加法 和4线程执行:

部分代码如下:

void Widget::on_pushButton_clicked()

{

    clock_t myClock = -clock();

    quint64 sum = 0;

    for(int k=1; k<=1000; k++)

    for(int j=1; j<=10000000; j++)

    {

        sum = 0;

        for(int i=1; i<=1000000; i++)

            sum += i;

    }

    myClock += clock();

    ui->label_sum->setText(QObject::tr("%1").arg(sum));

    ui->label_time->setText(QObject::tr("%1 ms").arg(myClock));

}

void Widget::on_pushButton_2_clicked()

{

    clock_t myClock = -clock();

    quint64 sum = 0;

#pragma omp parallel for num_threads(4) reduction(+:sum)

    for(int k=1; k<=1000; k++)

    for(int j=1; j<=10000000; j++)

    {

        sum = 0;

        for(int i=1; i<=1000000; i++)

            sum += i;

    }

    myClock += clock();

    ui->label_sum4->setText(QObject::tr("%1").arg(sum/4));

    ui->label_time4->setText(QObject::tr("%1 ms").arg(myClock));

}

那个Qt creator 还不错嘛...支持OMP扩展..我喜欢...