QTABLEWIDGET CONSUMES LOTS OF MEMORY

canrollas

Hi this is my table widget code which get signal from serial device every 0.5 milliseconds. But It consumes huge memory . For example it starts with 3mb ram ; after every 1 seconds it increases 3mb more. When I stop displaying the table it does not consume memory. What should I do about it? THX.

void MainWindow::getTavbleData(QString data, QString data2, QString data3, QString data4, QString data5, QString data6, QString data7, QString data8, QString data9, QString data10, QString data11, QString data12, QString data13)
{

    if(rowCheck>100){
        ui->tableWidget_2->clear();

        rowCheck = 0;
    }
    QVector<QTableWidgetItem> *widgetVector = new QVector<QTableWidgetItem>;

    rowCheck = rowCheck + 1;
    ui->tableWidget_2->setRowCount(rowCheck);
    QTableWidgetItem *table1 = new QTableWidgetItem(data);
    QTableWidgetItem *table2 = new QTableWidgetItem(data2);
    QTableWidgetItem *table3 = new QTableWidgetItem(data3);
    QTableWidgetItem *table4 = new QTableWidgetItem(data4);
    QTableWidgetItem *table5 = new QTableWidgetItem(data5);
    QTableWidgetItem *table6 = new QTableWidgetItem(data6);
    QTableWidgetItem *table7 = new QTableWidgetItem(data7);
    QTableWidgetItem *table8 = new QTableWidgetItem(data8);
    QTableWidgetItem *table9 = new QTableWidgetItem(data9);
    QTableWidgetItem *table10 = new QTableWidgetItem(data10);
    QTableWidgetItem *table11 = new QTableWidgetItem(data11);
    QTableWidgetItem *table12 = new QTableWidgetItem(data12);
    QTableWidgetItem *table13 = new QTableWidgetItem(data13);
    ui->tableWidget_2->setItem(rowCheck-1,0,table1 );
    ui->tableWidget_2->setItem(rowCheck-1,1,table2 );
    ui->tableWidget_2->setItem(rowCheck-1,2,table3 );
    ui->tableWidget_2->setItem(rowCheck-1,3,table4 );
    ui->tableWidget_2->setItem(rowCheck-1,4,table5 );
    ui->tableWidget_2->setItem(rowCheck-1,5,table6 );
    ui->tableWidget_2->setItem(rowCheck-1,6,table7 );
    ui->tableWidget_2->setItem(rowCheck-1,7,table8 );
    ui->tableWidget_2->setItem(rowCheck-1,8,table9 );
    ui->tableWidget_2->setItem(rowCheck-1,9,table10 );
    ui->tableWidget_2->setItem(rowCheck-1,10,table11 );
    ui->tableWidget_2->setItem(rowCheck-1,11,table12 );
    ui->tableWidget_2->setItem(rowCheck-1,12,table13 );




    if(rowCheck%10==0){
        ui->tableWidget_2->scrollToBottom();
    }
    widgetVector->clear();
    delete widgetVector;







}

SGaist

Hi,

What is the amount of data that you put into your table ?
What about that vector that you don't use ?

On a side note, please avoid writing titles all in upper case. In written language it's considered shouting and rude.

JonB

@canrollas
Also:

Does the extra memory used settle down after a while, or are you claiming it keeps increasing forever?
Can we assume you do allow the main Qt event loop to run in between calls to this function?

And as @SGaist said, are you hiding any code on the widgetVector?

canrollas

@SGaist It comes from serial device every 0.5 ms and basically It is parsed 36 digit hexadecimal message string . it produces 13 variable. The vector part was my fault which forget about deleting. It does not change the memory leak. Sorry about the uppercase Im fixing it.

canrollas

@JonB Thanks, I have answered the JonB you can take a look .

JonB

@canrollas I do not see a response to either of my questions.

Christian Ehrlicher

@canrollas said in QTABLEWIDGET CONSUMES LOTS OF MEMORY:

It comes from serial device every 0.5 ms and basically It is parsed 36 digit hexadecimal message string . it produces 13 variable.

Then use a proper table model and not a convenience QTableWidget. Also 0.5ms can not see anyone so I would suggest to strip down the number of rows.