Re: [SailfishDevel] QThread priority

[Andrey Kozhevnikov]

need to look into your parseReadyData

28.05.2014 22:03, Krisztian Olah ?????:

Hi Andrey,

Thanks for the answer, your snippet looks very similar to what I have. Perhaps if I posted my code segment would be of help in helping me figuring out where I'm wrong. During parsing CPU usage reaches 97-100% which causes my GUI to hang(I have about 500 000 opening and closing tags and half of the enclosed items I need to process: save, in some cases insert spaces, etc), especially awkward when I start parsing whilst still fetching the data from network(sometimes hangs during pageStack.push() ), but it's bad for up to 2-5 seconds nevertheless. I wouldn't mind if parsing took 10 seconds if GUI was responsive. This is what I'm doing:

void SomeClass::someMethod() {
              MyContainer* container = new MyContainer();

//reader has a handle to container, through which it populates the container MyXmlStreamReader* parser = new MyXmlStreamReader(container);

              QThread* parserThread = new QThread();
parser->moveToThread(parserThread);
         connect(parser, SIGNAL(finished()), this, SLOT(onParsingFinished) );
         connect(parser, SIGNAL(finished()), parserThread, SLOT(quit()) );
         connect(parser, SIGNAL(finished()), parser, SLOT(deleteLater()) );
         connect(parserThread, SIGNAL(finished()), parserThread, 
SLOT(deleteLater()) );
         parserThread->start();
         reply = networkMngr->get(QNetworkRequest(someUrl)); //both pointers 
are class members
         connect(reply, SIGNAL(finished()), this, SLOT(onAllDataRecieved()) );
         //this starts the parser with the data available at the time,
               // when parser reaches the end of xml document it emits 
itsfinished() signal
         connect(reply, SIGNAL(readyRead()), this, SLOT(parseReadyData()) );
}

Thanks again
Kris

On 28 May 2014 06:16, Andrey Kozhevnikov <coderusin...@gmail.com <mailto:coderusin...@gmail.com>> wrote:

    it can't "doesn't help much". you initializing thread wrong.

    simple threading way is:

    MyXmlParser *parser = new MyXmlParser(xmlDocument);
    QThread *thread = new QThread(parser);
    parser->moveToThread(thread);
    QObject::connect(thread, SIGNAL(started()), parser, SLOT(parse()));
    QObject::connect(parser, SIGNAL(parseComplete(QVariantMap)), this,
    SLOT(onParseComplete(QVariantMap)));
    thread->start();

    28.05.2014 03:24, Krisztian Olah ?????:

          Hi list,
      I have a rather large xml file to parse and it causes the UI to
    freeze, I assingned the parser to a different thread, but it
    doesn't help much. According to the Qt documentation
    QThread::setPriority() doesn't work on Linux, is there some kind
    of workaround that could be used?

    Thanks
    Kris


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