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[UWP] Severe memory leak

Hi Syncfusion,

The PDF viewer control for Xamarin Forms has a serious memory leak issue on UWP. (On iOS it does seem to work fine for the time being)

Please find the attached two screenshots I've made from profiling one of my apps with Visual Studio 2017.
I am using version 15.3451.0.26 of the PDF viewer.
In my app I have a list of PDF files to open, the largest one being 7 megabytes, the smallest 25 kilobytes, each having on average one picture in them.
Clicking a button on the app will open the file on a separate page, which is defined as follows:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             xmlns:xForms="clr-namespace:Syncfusion.SfPdfViewer.XForms;assembly=Syncfusion.SfPdfViewer.XForms"
             x:Class="Gbk.Client.UI.Xamarin.Views.SpecSheetPage"
             mvvm:ViewModelLocator.AutowireViewModel="True" BackgroundColor="{StaticResource NavColor}">
    <AbsoluteLayout BackgroundColor="White">
        <AbsoluteLayout.Margin>
            <OnPlatform x:TypeArguments="Thickness">
                <On Platform="iOS">0,20,0,0</On> <On Platform="Windows,Android">0</On>
            </OnPlatform>
        </AbsoluteLayout.Margin>
        <xForms:SfPdfViewer InputFileStream="{Binding Source}"  AbsoluteLayout.LayoutBounds="0,50,1,1" AbsoluteLayout.LayoutFlags="HeightProportional,WidthProportional" />
    </AbsoluteLayout>
</ContentPage>

As you can see, there is nothing strange on the page, it's just a simple ContentPage with one AbsoluteLayout having the PdfViewer inside it.

I have attached the profiler to the app session, then started the app, and on about the 30 second mark I opened the first PDF, then I hit the hardware back button to take me back to the list page, around 1 minute opened a second one, then hit back and then around 1:30 a third one. As you can see the memory consumption of the app grew steadily.

I am able to crash my app consistently just by opening and closing files in a row in the aforementioned fashion - I can easily get to several gigabytes of RAM usage.

As you can see on the other screenshot, the application is keeping alive several instances of MemoryStreams, and several SyncFusion PDF objects even after navigating away from the page.

The stream is closed and disposed of when going back in the view's code behind manually, but it does not seem to affect the performance.

Can you please take a look into this matter? We can not publish this app with a broken PDF viewer component such as this.

Attachment: Documents_c7b9413a.zip

3 Replies
BS Balasubramanian Sundararajan Syncfusion Team December 14, 2017 12:02 PM UTC

Hi Balazs,    
   
A support incident to track the status of this query has been created under your account. Please log on to our support website to check for further updates.     


Kindly let us know if you need further assistance.      
   
Thanks,    
Balasubramanian S    


ID Ian Davidson June 3, 2019 09:51 AM UTC

Has there been a solution to this problem? I am using the latest version of PDF Viewer in UWP and when I open a PDF and leave the application open, it will continue to eat the available memory. I left it running over night and it had consumed 3Gb. I left it over a weekend and when I logged back into my laptop, it was sitting at 9GB! 

We have an application running on a tablet which has limited resources. It is causing lag and slow down on the device. 

The above also happens if i've opened a PDF, and then closed that page down. It will continue to consume memory in the background. 

SS Sathish Sivakumar Syncfusion Team June 4, 2019 12:45 PM UTC

Hi,     
 
A support incident to track the status of this query has been created under your account. Please log on to our support website to check for further updates.      
 
 
Kindly let us know if you need further assistance.       
  
Thanks,     
Sathish 


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