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Memory leak?

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Chart

This is a migrated thread and some comments may be shown as answers.

SteveL asked on 12 Aug 2009, 08:54 PM

I've just installed the latest Q2 SP1 controls, and I seem to have a problem with memory usage. My application binds the chart series to an observable collection, and adds a new item to the collection every few seconds. Each time a new item is added, the memory usage goes up by several megabytes! I've created a simple test case that demonstrates the problem:

    
            public partial class MainPage : UserControl 
        
                { 
        
                    private ObservableCollection<TestData> testDataSource; 
        
                    private Random random; 
        
                    DispatcherTimer timer; 
        
                    public MainPage() 
        
                    { 
        
                        InitializeComponent(); 
        
                        random = new Random(); 
        
                        testDataSource = new ObservableCollection<TestData>(); 
        
                        testChart.DefaultView.ChartArea.AxisX.IsDateTime = true; 
        
                        testChart.DefaultView.ChartArea.AxisX.DefaultLabelFormat = "t"; 
        
                        // turn off animations 
        
                        testChart.DefaultView.ChartArea.EnableAnimations = false; 
        
                        // create mapping of data to axes 
        
                        SeriesMapping seriesMapping = new SeriesMapping(); 
        
                        seriesMapping.SeriesDefinition = new LineSeriesDefinition(); 
        
                        seriesMapping.SeriesDefinition.ShowItemLabels = false; 
        
                        seriesMapping.SeriesDefinition.ShowItemToolTips = true; 
        
                        (seriesMapping.SeriesDefinition as LineSeriesDefinition).ShowPointMarks = false; 
        
                        seriesMapping.SeriesDefinition.ItemToolTipFormat = "F1"; 
        
                        seriesMapping.LegendLabel = "Test data"; 
        
                        ItemMapping itemMapping = new ItemMapping(); 
        
                        itemMapping.DataPointMember = DataPointMember.XValue; 
        
                        itemMapping.FieldName = "DT"; 
        
                        seriesMapping.ItemMappings.Add(itemMapping); 
        
                        ItemMapping itemMapping2 = new ItemMapping(); 
        
                        itemMapping2.DataPointMember = DataPointMember.YValue; 
        
                        itemMapping2.FieldName = "TestItem"; 
        
                        seriesMapping.ItemMappings.Add(itemMapping2); 
        
                        testChart.SeriesMappings.Add(seriesMapping); 
        
                        testChart.ItemsSource = testDataSource; 
        
                        timer = new DispatcherTimer(); 
        
                        timer.Interval = TimeSpan.FromMilliseconds(5000); 
        
                        timer.Tick += new EventHandler(timer_Tick); 
        
                        timer.Start(); 
        
                    } 
        
                    private void timer_Tick(object sender, EventArgs e) 
        
                    { 
        
                        testDataSource.Add(new TestData { DT = DateTime.Now, TestItem = random.Next(10) }); 
        
                    } 
        
                } 
        
                public class TestData 
        
                { 
        
                    public DateTime DT { get; set; } 
        
                    public double TestItem 
        
                    { 
        
                        get { return _testitem; } 
        
                        set 
        
                        { 
        
                            _testitem = value; 
        
                            var handler = PropertyChanged; 
        
                            if (null != handler) 
        
                            { 
        
                                handler.Invoke(this, new PropertyChangedEventArgs("TestItem")); 
        
                            } 
        
                        } 
        
                    } 
        
                    private double _testitem; 
        
                    public event PropertyChangedEventHandler PropertyChanged; 
        
                }

Am I doing something wrong, or is there a problem with the new controls? I don't think I had this with the previous version of the SL3 controls.

Steve

27 Answers, 1 is accepted

answered on 02 Sep 2009, 06:19 AM

Hi,

Was the theming issue fixed in the recent internal builds. Because, In my silverlight 3 application I have two controls one with grid and another having grid and charts. Both following a simple Data Binding Pattern. Now, I found out using basic Task Manager that when I bound to the other view the memory usage is increasing like anything. The charts are not using the default layout and are rendering multiple line series. All the features like point marks, tool tips are disabled. The chart renders values of type double against dates. Here i am posting my findings for the two views:

This tests are done on Build : RadControls_for_Silverlight_2009_2_821_trial
Basic Grid Control Data Binding
Records                Actual Usage

15000                    18MB

18000                    25MB

27000                    50MB

31500                    55MB

Chart + Grid Control Binding

Records                Actual Usage

3500                       92MB

5500                       133MB             UI starts Not responding!!!

8500                       219MB

13000                    310MB           Charts stops Rendering!!!

As, you can see there is some issue with the Chart Control, I tried downloading the latest internal Build: RadControls_for_Silverlight_2009_2_828_trial but then the memory profile in all the above cases increase by twice!!!

Thanks & Regards,
Yusuf Nazami

answered on 08 Oct 2009, 07:14 PM

We upgraded to 2009.2.1002.1030, still the problem of memory exists.

I conducted a little quick test on http://demos.telerik.com/silverlight/#Chart/FirstLook. Click and hover ( for tool tip ) on monthly chart every time this activity is performed it increases nearly 5 MB to memory foot print.

Our problem is more serious we have created a dashboard using telerik components. Charts and other components are refreshed every 30 seconds, thus the memory used by the application is doubled and never released by the browser. So, if the application is left for much time memory raises beyond 1 GB.

Please advice on this serious memory issue.

thank you very much

answered on 20 Jan 2010, 08:38 AM

Hi Maxim,

Actually yes. I've been in close communication with the MS Silverlight team and they have confirmed the leak indeed originates in the SL runtime. So far we are not aware of a work-around.

The good news is that this is scheduled to be fixed for SL4, the bad news is that they will probably not bother with SL3.

I realize this is not what both you and me were hoping to hear, but I am afraid runtime leaks are beyond the scope of what we can do.

Yours Sincerely,
Vladimir Milev
the Telerik team

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Memory leak?

27 Answers, 1 is accepted