Bug 115695

Description Charles Tuckey 2005-11-09 15:48:49 EST

My tests show that TableViewer performance begins to lag with large
numbers of records but SWT Table handles it just fine.
I have attached demo source code at the end of the message.

What I have found is that the TableViewer does not scale well when the
MULTI style is set. In fact, at 100,000 records it is not usable for
arrow navigation. Without the MULTI style set it has acceptable
performance.

The navigation test I used is to select a record and then
hold down the down-arrow key while watching the CPU usage and the
responsiveness of the application. I expect the CPU usage to be
reasonable, say less than 50%, and the application to keep up. (I am
running FC4 on an AMD 3200+ CPU with 1 GB of RAM) My tests show
that TableViewer begins to lag with large numbers of records but
SWT Table handles it just fine. Here are my test results:

JFace TableViewer (with MULTI/without MULTI)
10,000 rows, CPU (23%/1%), responsiveness OK
100,000 rows, CPU (96%/25%), responsiveness (awful/OK)

SWT Table (with MULTI/without MULTI)
10,000 rows, CPU (1%/0.5%), responsiveness OK
100,000 rows, CPU (11%/0.5%), responsiveness OK

********** JFace TableViewer test code **********
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;

public class JfaceTable {
    public static void main(String[] args) {
        int itemCount = args.length == 0? 100000 : Integer.parseInt(args[0]);
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new RowLayout(SWT.VERTICAL));
        TableViewer viewer = new TableViewer(shell, SWT.VIRTUAL);
//        TableViewer viewer = new TableViewer(shell, SWT.MULTI | SWT.VIRTUAL);
        viewer.getTable().setLayoutData(new RowData(200, 200));
        viewer.setItemCount(itemCount);
        for (shell.pack(), shell.open(); !shell.isDisposed();) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}

********** SWT Table test code **********
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;

public class SwtTable {

    public static void main(String[] args) {
        int itemCount = args.length == 0? 100000 : Integer.parseInt(args[0]);
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new RowLayout(SWT.VERTICAL));
        Table table = new Table(shell, SWT.MULTI | SWT.VIRTUAL);
//        Table table = new Table(shell, SWT.VIRTUAL);
        table.setLayoutData(new RowData(200, 200));
        table.setItemCount(itemCount);
        for (shell.pack(), shell.open(); !shell.isDisposed();) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}