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Qt6 Windows slower than Qt6 Ubuntu

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ubuntuwindows 10 instmsvcgccqt6
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  • J Joe von Habsburg

    @jsulm

    This is my code for take data with get request.

    void DataReceiver::start()
    {
        _connection++;
        if(_connection > 1)
            return;
    
        qDebug() << "Starting take data";
        _takeData = true;
        while(_takeData){
            QDateTime time1 = QDateTime::currentDateTime();
            _sample = getData(54664);
            QDateTime time3 = QDateTime::currentDateTime();
            if(_takeIQData)
                _iq = getData(54665);
            QDateTime time2 = QDateTime::currentDateTime();
            qDebug() << "sample : " << time3 - time1 << " iq : " << time2 - time3 << "time : " << time2 - time1;
            emit sendData(_sample, _iq);
        }
        qDebug() << "Finished taking data";
    }
    
    QByteArray DataReceiver::getData(int port)
    {
        QString url = QString("http://localhost:%1/sample").arg(port);
        QUrl apiUrl(url);
        QNetworkAccessManager manager;
        QNetworkRequest request(apiUrl);
        QNetworkReply *reply = manager.get(request);
        QEventLoop loop;
        connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
        loop.exec();
        if (reply->error() == QNetworkReply::NoError) {
            QByteArray responseData = reply->readAll();
            return responseData;
            reply->deleteLater();
        } else {
            QString _error = tr("Error");
            QString _spectrum_error = tr("Spectrum error.");
            QMessageBox::critical(nullptr, _error, _spectrum_error);
            stop();
        }
        reply->deleteLater();
        return NULL;
    }
    
    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by
    #5

    @Joe-von-Habsburg
    If you are calling this multiple times at least correct so as not to leak the QNetworkReply. Probably irrelevant, but just in case.

    How do timings compare on each platform quite outside of a Qt program?

    J JonBJ 2 Replies Last reply
    0
    • JonBJ JonB

      @Joe-von-Habsburg
      If you are calling this multiple times at least correct so as not to leak the QNetworkReply. Probably irrelevant, but just in case.

      How do timings compare on each platform quite outside of a Qt program?

      J Offline
      J Offline
      Joe von Habsburg
      wrote on last edited by
      #6

      @JonB
      I watch debug line and graphic. The data which is came, it's graphic data and I draw i it (drawing is 30ms).

      Debug line :

      qDebug() << "sample : " << time3 - time1 << " iq : " << time2 - time3 << "time : " << time2 - time1;
      

      In ubuntu : 150ms 0ms 150ms
      In windows : 400ms 0ms 400ms

      How can I take data with different way ? Can you give any example?

      Note: The data is come with only get request.

      JonBJ 1 Reply Last reply
      0
      • J Joe von Habsburg

        @JonB
        I watch debug line and graphic. The data which is came, it's graphic data and I draw i it (drawing is 30ms).

        Debug line :

        qDebug() << "sample : " << time3 - time1 << " iq : " << time2 - time3 << "time : " << time2 - time1;
        

        In ubuntu : 150ms 0ms 150ms
        In windows : 400ms 0ms 400ms

        How can I take data with different way ? Can you give any example?

        Note: The data is come with only get request.

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #7

        @Joe-von-Habsburg
        I have suggested what you should test first, but you have said nothing each time.. I also suggested you do not test anything with the "debug" in "debug line and graphic".

        J 1 Reply Last reply
        0
        • JonBJ JonB

          @Joe-von-Habsburg
          I have suggested what you should test first, but you have said nothing each time.. I also suggested you do not test anything with the "debug" in "debug line and graphic".

          J Offline
          J Offline
          Joe von Habsburg
          wrote on last edited by
          #8

          @JonB I run release versions, and I saw same thing. Any advice for get request ? And is it possible, gcc more performance than msvc ?

          JonBJ 1 Reply Last reply
          0
          • J Joe von Habsburg

            @JonB I run release versions, and I saw same thing. Any advice for get request ? And is it possible, gcc more performance than msvc ?

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by JonB
            #9

            @Joe-von-Habsburg
            No, compiler is not going to make any difference when fetching data over a network and it's taking hundreds of milliseconds.

            J 1 Reply Last reply
            0
            • JonBJ JonB

              @Joe-von-Habsburg
              No, compiler is not going to make any difference when fetching data over a network and it's taking hundreds of milliseconds.

              J Offline
              J Offline
              Joe von Habsburg
              wrote on last edited by
              #10

              @JonB

              I wrote basic program just taking data. (Because I suspect other code lines slow me). I saw same output.

              Can you give me code example for get request ?

              1 Reply Last reply
              0
              • JonBJ JonB

                @Joe-von-Habsburg
                If you are calling this multiple times at least correct so as not to leak the QNetworkReply. Probably irrelevant, but just in case.

                How do timings compare on each platform quite outside of a Qt program?

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by
                #11

                @JonB said in Qt6 Windows slower than Qt6 Ubuntu:

                How do timings compare on each platform quite outside of a Qt program?

                J 1 Reply Last reply
                0
                • JonBJ JonB

                  @JonB said in Qt6 Windows slower than Qt6 Ubuntu:

                  How do timings compare on each platform quite outside of a Qt program?

                  J Offline
                  J Offline
                  Joe von Habsburg
                  wrote on last edited by
                  #12

                  @JonB I watched graphic speed

                  jsulmJ 1 Reply Last reply
                  0
                  • J Joe von Habsburg

                    @JonB I watched graphic speed

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    @Joe-von-Habsburg You should read more carefully what others write. What @JonB suggested is that you try to get the data with a non Qt application on both platforms to see whether the behaviour is the same or not...

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

                    J 1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @Joe-von-Habsburg You should read more carefully what others write. What @JonB suggested is that you try to get the data with a non Qt application on both platforms to see whether the behaviour is the same or not...

                      J Offline
                      J Offline
                      Joe von Habsburg
                      wrote on last edited by
                      #14

                      @jsulm I used javascript for get request.

                      const deneme = async() => {
                          while(true){
                              var date1 = new Date();
                          
                              var res = await fetch('http://localhost:54664/sample')
                              var data = await res.json();
                              console.log("sample len : ",data.samples[0].length)
                          
                              var date2 = new Date();
                          
                              var res2 = await fetch('http://localhost:54665/sample')
                              var data2 = await res2.json();
                              console.log("sample len : ",data2.samples[0].length)
                          
                              var date3 = new Date();
                          
                              console.log("sample : ", date2-date1, " - iq : ", date3 - date2, " - time : ", date3 - date1);
                          }
                      }
                      
                      
                      deneme();
                      

                      I saw same times between ubuntu and windows (90ms).
                      I think the problem is in windows Qt. Any idea ?

                      jsulmJ 1 Reply Last reply
                      0
                      • J Joe von Habsburg

                        @jsulm I used javascript for get request.

                        const deneme = async() => {
                            while(true){
                                var date1 = new Date();
                            
                                var res = await fetch('http://localhost:54664/sample')
                                var data = await res.json();
                                console.log("sample len : ",data.samples[0].length)
                            
                                var date2 = new Date();
                            
                                var res2 = await fetch('http://localhost:54665/sample')
                                var data2 = await res2.json();
                                console.log("sample len : ",data2.samples[0].length)
                            
                                var date3 = new Date();
                            
                                console.log("sample : ", date2-date1, " - iq : ", date3 - date2, " - time : ", date3 - date1);
                            }
                        }
                        
                        
                        deneme();
                        

                        I saw same times between ubuntu and windows (90ms).
                        I think the problem is in windows Qt. Any idea ?

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #15

                        @Joe-von-Habsburg You should try to do your networking properly: without local event loops. Qt is asynchronous.

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        Christian EhrlicherC 1 Reply Last reply
                        0
                        • jsulmJ jsulm

                          @Joe-von-Habsburg You should try to do your networking properly: without local event loops. Qt is asynchronous.

                          Christian EhrlicherC Offline
                          Christian EhrlicherC Offline
                          Christian Ehrlicher
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

                          ... And you should/must not recreate the QNetworkAcceesManager every time.

                          Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                          Visit the Qt Academy at https://academy.qt.io/catalog

                          J 2 Replies Last reply
                          4
                          • Christian EhrlicherC Christian Ehrlicher

                            ... And you should/must not recreate the QNetworkAcceesManager every time.

                            J Offline
                            J Offline
                            Joe von Habsburg
                            wrote on last edited by
                            #17

                            @Christian-Ehrlicher said in Qt6 Windows slower than Qt6 Ubuntu:

                            And you should/must not recreate the QNetworkAcceesManager every time.

                            This work for me. Thank you so much :)

                            1 Reply Last reply
                            0
                            • Christian EhrlicherC Christian Ehrlicher

                              ... And you should/must not recreate the QNetworkAcceesManager every time.

                              J Offline
                              J Offline
                              Joe von Habsburg
                              wrote on last edited by
                              #18

                              @Christian-Ehrlicher

                              I have another question. I received some times between ubuntu and windows (65ms). Everything is ok. But, sometimes windows rising 350ms for one packet. In ubuntu just max 80ms.

                              QByteArray DataReceiver::getData(int port)
                              {
                                  QString url = QString("http://localhost:%1/sample").arg(port);
                                  _apiUrl.setUrl(url);
                                  _request.setUrl(_apiUrl);
                                  _reply = _manager.get(_request);
                                  connect(_reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                  _loop.exec();
                                  if (_reply->error() == QNetworkReply::NoError) {
                                      QByteArray responseData = _reply->readAll();
                                      _reply->deleteLater();
                                      return responseData;
                                  } else {
                                      QString _error = tr("Error");
                                      QString _spectrum_error = tr("Spectrum error.");
                                      QMessageBox::critical(nullptr, _error, _spectrum_error);
                                      stop();
                                  }
                                  _reply->deleteLater();
                                  return NULL;
                              }
                              

                              Do you know, why it's rising ? What can I do another, after take data ?

                              J 1 Reply Last reply
                              0
                              • J Joe von Habsburg

                                @Christian-Ehrlicher

                                I have another question. I received some times between ubuntu and windows (65ms). Everything is ok. But, sometimes windows rising 350ms for one packet. In ubuntu just max 80ms.

                                QByteArray DataReceiver::getData(int port)
                                {
                                    QString url = QString("http://localhost:%1/sample").arg(port);
                                    _apiUrl.setUrl(url);
                                    _request.setUrl(_apiUrl);
                                    _reply = _manager.get(_request);
                                    connect(_reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                    _loop.exec();
                                    if (_reply->error() == QNetworkReply::NoError) {
                                        QByteArray responseData = _reply->readAll();
                                        _reply->deleteLater();
                                        return responseData;
                                    } else {
                                        QString _error = tr("Error");
                                        QString _spectrum_error = tr("Spectrum error.");
                                        QMessageBox::critical(nullptr, _error, _spectrum_error);
                                        stop();
                                    }
                                    _reply->deleteLater();
                                    return NULL;
                                }
                                

                                Do you know, why it's rising ? What can I do another, after take data ?

                                J Offline
                                J Offline
                                Joe von Habsburg
                                wrote on last edited by
                                #19

                                @Joe-von-Habsburg I found the reason. Thanks a lot :) <3

                                V 1 Reply Last reply
                                0
                                • J Joe von Habsburg

                                  @Joe-von-Habsburg I found the reason. Thanks a lot :) <3

                                  V Offline
                                  V Offline
                                  Volker75
                                  wrote on last edited by
                                  #20

                                  @Joe-von-Habsburg And what was the reason? Windows defender?

                                  J 1 Reply Last reply
                                  0
                                  • V Volker75

                                    @Joe-von-Habsburg And what was the reason? Windows defender?

                                    J Offline
                                    J Offline
                                    Joe von Habsburg
                                    wrote on last edited by Joe von Habsburg
                                    #21

                                    @Volker75 said in Qt6 Windows slower than Qt6 Ubuntu:

                                    And what was the reason? Windows defender?

                                    another networkmanager.....

                                    @Christian-Ehrlicher , @JonB , @jsulm

                                    Hi guys, I need your help. When I run the my program (only data receive) after 30min, my ram will be 20gb. It's increase always. I tested it in Ubuntu and Windows and I saw same thing. What should I do after take data?

                                    QByteArray DataReceiver::getData(int port)
                                    {
                                        QString url = QString("http://localhost:%1/sample").arg(port);
                                        _apiUrl.setUrl(url);
                                        _request.setUrl(_apiUrl);
                                        reply = _manager.get(_request);
                                        connect(reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                        _loop.exec();
                                        if (reply->error() == QNetworkReply::NoError) {
                                            QByteArray responseData = reply->readAll();
                                            reply->deleteLater();
                                            return  responseData;
                                        } else {
                                            QString _error = tr("Error");
                                            QString _spectrum_error = tr("Spectrum error.");
                                            QMessageBox::critical(nullptr, _error, _spectrum_error);
                                            stop();
                                        }
                                        reply->deleteLater();
                                        return {};
                                    }
                                    

                                    if I use my code like that :

                                    QByteArray DataReceiver::getData(int port)
                                    {
                                        QString url = QString("http://localhost:%1/sample").arg(port);
                                        QUrl _apiUrl(url);
                                        QNetworkRequest _request(_apiUrl);
                                        QEventLoop _loop;
                                        QNetworkAccessManager _manager;
                                        QNetworkReply *reply = _manager.get(_request);
                                        connect(reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                        _loop.exec();
                                        if (reply->error() == QNetworkReply::NoError) {
                                            QByteArray responseData = reply->readAll();
                                            reply->deleteLater();
                                            return  responseData;
                                        } else {
                                            QString _error = tr("Error");
                                            QString _spectrum_error = tr("Spectrum error.");
                                            QMessageBox::critical(nullptr, _error, _spectrum_error);
                                            stop();
                                        }
                                        reply->deleteLater();
                                        return {};
                                    }
                                    

                                    Memory will not rise but response time slow....

                                    JonBJ 1 Reply Last reply
                                    0
                                    • J Joe von Habsburg

                                      @Volker75 said in Qt6 Windows slower than Qt6 Ubuntu:

                                      And what was the reason? Windows defender?

                                      another networkmanager.....

                                      @Christian-Ehrlicher , @JonB , @jsulm

                                      Hi guys, I need your help. When I run the my program (only data receive) after 30min, my ram will be 20gb. It's increase always. I tested it in Ubuntu and Windows and I saw same thing. What should I do after take data?

                                      QByteArray DataReceiver::getData(int port)
                                      {
                                          QString url = QString("http://localhost:%1/sample").arg(port);
                                          _apiUrl.setUrl(url);
                                          _request.setUrl(_apiUrl);
                                          reply = _manager.get(_request);
                                          connect(reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                          _loop.exec();
                                          if (reply->error() == QNetworkReply::NoError) {
                                              QByteArray responseData = reply->readAll();
                                              reply->deleteLater();
                                              return  responseData;
                                          } else {
                                              QString _error = tr("Error");
                                              QString _spectrum_error = tr("Spectrum error.");
                                              QMessageBox::critical(nullptr, _error, _spectrum_error);
                                              stop();
                                          }
                                          reply->deleteLater();
                                          return {};
                                      }
                                      

                                      if I use my code like that :

                                      QByteArray DataReceiver::getData(int port)
                                      {
                                          QString url = QString("http://localhost:%1/sample").arg(port);
                                          QUrl _apiUrl(url);
                                          QNetworkRequest _request(_apiUrl);
                                          QEventLoop _loop;
                                          QNetworkAccessManager _manager;
                                          QNetworkReply *reply = _manager.get(_request);
                                          connect(reply, &QNetworkReply::finished, &_loop, &QEventLoop::quit);
                                          _loop.exec();
                                          if (reply->error() == QNetworkReply::NoError) {
                                              QByteArray responseData = reply->readAll();
                                              reply->deleteLater();
                                              return  responseData;
                                          } else {
                                              QString _error = tr("Error");
                                              QString _spectrum_error = tr("Spectrum error.");
                                              QMessageBox::critical(nullptr, _error, _spectrum_error);
                                              stop();
                                          }
                                          reply->deleteLater();
                                          return {};
                                      }
                                      

                                      Memory will not rise but response time slow....

                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by
                                      #22

                                      @Joe-von-Habsburg
                                      Is the difference due to the QNetworkAccessManager _manager; or to the QNetworkReply *reply = _manager.get(_request);?
                                      In the bad case you might connect to reply->destroyed() to make sure it is indeed getting freed.

                                      J 1 Reply Last reply
                                      0
                                      • JonBJ JonB

                                        @Joe-von-Habsburg
                                        Is the difference due to the QNetworkAccessManager _manager; or to the QNetworkReply *reply = _manager.get(_request);?
                                        In the bad case you might connect to reply->destroyed() to make sure it is indeed getting freed.

                                        J Offline
                                        J Offline
                                        Joe von Habsburg
                                        wrote on last edited by Joe von Habsburg
                                        #23

                                        @JonB

                                        According to my tests, if I rebuild the NetworkManager, my memory usage does not increase. But this time my receiving time is slowing down.

                                        If I do not recreate the NetworkManager, my reception time decreases but memory usage increases.

                                        connect(reply, &QNetworkReply::destroyed, this, &DataReceiver::replyDeleted);
                                        

                                        it's work, reply deleted

                                        JonBJ J 2 Replies Last reply
                                        0
                                        • J Joe von Habsburg

                                          @JonB

                                          According to my tests, if I rebuild the NetworkManager, my memory usage does not increase. But this time my receiving time is slowing down.

                                          If I do not recreate the NetworkManager, my reception time decreases but memory usage increases.

                                          connect(reply, &QNetworkReply::destroyed, this, &DataReceiver::replyDeleted);
                                          

                                          it's work, reply deleted

                                          JonBJ Offline
                                          JonBJ Offline
                                          JonB
                                          wrote on last edited by
                                          #24

                                          @Joe-von-Habsburg
                                          In that case please replace the second one's QNetworkReply *reply = _manager.get(_request); with the first one's reply = _manager.get(_request); (I assume reply is a member variable, this->reply) and confirm. Then the only difference is the local QNetworkAccessManager _manager versus a class member one.

                                          1 Reply Last reply
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