Questions about slot execution.

[skimmer]

Assumme I have a qapplication with a qmainwindow.
In the qmainwindow is a timer emitting the signal timeout(). This signal is connected to a slot computeAlot() which does a lot of computing.

Something like this:

main.cpp

#include <QApplication>
#include "mainWindow.h"
int main(int argc, char* argv[])
{
	QApplication application(argc, argv);	
	MainWindow mainWindow(0);
	mainWindow.show();
	return application.exec();
}

#include <QApplication>
#include "mainWindow.h"
int main(int argc, char* argv[])
{
	QApplication application(argc, argv);	
	MainWindow mainWindow(0);
	mainWindow.show();
	return application.exec();
}

To copy to clipboard, switch view to plain text mode 

mainWindow.h:

#include <QMainWindow>
#include <QTest>
class MainWindow : public QMainWindow
{
    Q_OBJECT        
public:
     explicit MainWindow(QWidget * parent = 0);   
private slots:
     void computeAlot();
}

#include <QMainWindow>
#include <QTest>
class MainWindow : public QMainWindow
{
    Q_OBJECT        
public:
     explicit MainWindow(QWidget * parent = 0);   
private slots:
     void computeAlot();
}

To copy to clipboard, switch view to plain text mode 

mainWindow.cpp

#include "mainWindow.h"
MainWindow::MainWindow(QWidget *parent)
{
    const int updateRate = 10; //ms
    const Qt::ConnectionType connectionType = Qt::QueuedConnection;
    QTimer timer;
    connect(timer, SIGNAL(timeout()), this, SLOT(computeAlot()), connectionType);
    timer.start(updateRate);
}
MainWindow::ComputeAlot()
{
    const int computationTime = 500; //ms
    // Should do some computions here
    QTest::qSleep(computationTime);
}

#include "mainWindow.h"
MainWindow::MainWindow(QWidget *parent)
{
    const int updateRate = 10; //ms
    const Qt::ConnectionType connectionType = Qt::QueuedConnection;
    QTimer timer;
    connect(timer, SIGNAL(timeout()), this, SLOT(computeAlot()), connectionType);
    timer.start(updateRate);
}
MainWindow::ComputeAlot()
{
    const int computationTime = 500; //ms
    // Should do some computions here
    QTest::qSleep(computationTime);
}

To copy to clipboard, switch view to plain text mode 

If the computationTime is higher than the updateRate how often will ComputeAlot() be executed if the timer stops after 100ms? Is it executed 10 times or one time or some threshold times?
Is this behavior dependent of the connectionType?
Would there be a different behavior if the ComputeAlot() would be executed in a different thread?

And if I want the computeAlot() slot be executed as often as possible while the GUI stays responsive, how do i do that? I discovered if I set the updateRate to 0 the GUI is not nicely responsive.

Thanx