Qt creator下测试Openmp样例代码

#include "widget.h" #include "ui_widget.h" #include "time.h" #include "omp.h" Widget::Widget(QWidget *parent) : QMainWindow(parent), ui(new Ui::Widget) { ui->setupUi(this); } Widget::~Widget() { delete ui; } 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_5->setText(QObject::tr("%1").arg(sum)); ui->label_6->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(2) 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_7->setText(QObject::tr("%1").arg(sum/4)); ui->label_8->setText(QObject::tr("%1 ms").arg(myClock)); }