PDFsharp & MigraDoc Foundation

We use a Backend-application to merge and transfer PDF-files on our server.

First a customer loads a PDF file in separate pages to our server. It is placed in a Jobs-directory.
When the transfer is complete our Backend-application merges the PDF files to one large PDF file.
It then transfers the PDF file to a other location on the server.

Smaller PDF files are no problem, but when merging a large PDF file(1,2gb and up). We get the following message:



System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
at PdfSharp.Pdf.PdfDictionary.PdfStream.Clone()
at PdfSharp.Pdf.PdfDictionary.Copy()
at PdfSharp.Pdf.PdfObject.Clone()
at PdfSharp.Pdf.PdfObject.ImportClosure(PdfImportedObjectTable importedObjectTable, PdfDocument owner, PdfObject externalObject)
at PdfSharp.Pdf.PdfPages.CloneElement(PdfPage page, PdfPage importPage, String key, Boolean deepcopy)
at PdfSharp.Pdf.PdfPages.ImportExternalPage(PdfPage importPage)
at PdfSharp.Pdf.PdfPages.Insert(Int32 index, PdfPage page)
at PdfSharp.Pdf.PdfDocument.AddPage(PdfPage page)
at ChrisRussell.Core.PDF.PDFEditor.MergePDFs(String[] pages, String filename) in D:\Source\ChrisRussell\_lib\ChrisRussell.Core.PDF\PDFEditor.cs:line 61
at ChrisRussell.Data.DataChunk.PrepareForPrinting(OrderLine orderLine, Int32 ChunkId, BarcodeLocation barcodeLocation, PrinterQueue printerQueue) in D:\Source\ChrisRussell\_lib\ChrisRussell.Data\DataChunk.cs:line 200
at ChrisRussell.Data.Upload.PrepareForPrinting(OrderLine orderLine, OrderLineChunk ol, BarcodeLocation bl) in D:\Source\ChrisRussell\_lib\ChrisRussell.Data\Upload.cs:line 320
at ChrisRussell.Data.Upload.PreperareForPrinting(OrderLine orderLine) in D:\Source\ChrisRussell\_lib\ChrisRussell.Data\Upload.cs:line 274
at ChrisRussell.Data.OrderLine.PrepareForPrinting() in D:\Source\ChrisRussell\_lib\ChrisRussell.Data\OrderLine.cs:line 302
at ChrisRussell.Data.Order.PrepareForPrinting() in D:\Source\ChrisRussell\_lib\ChrisRussell.Data\Order.cs:line 741
at ChrisRussell.BackEnd.Program.Main()


Trying to solve the problem we've bought a new 64bit 4 processor server with 12gb RAM. This didn't solve the problem.

The stacktrace shows that "PdfSharp.Pdf.PdfDictionary.PdfStream.Clone()" produces the problem. Can anyone tell me how we can solve the problem?

I presume you made sure that your application is running as a 64 bit process (32 bit processes are limited to 2 or 3 GB).

Increasing GDIProcessHandleQuota might help.
See the first post by "Mark Wilson-Thomas" in this thread:
http://social.msdn.microsoft.com/forums ... 8be25d5c4/

Switching from GDI+ to WPF mode or vice versa could make a difference.

_________________
Regards
Thomas Hoevel
PDFsharp Team

Hello Thomas,

Thanks for your reaction.

The application is a console application. So it's not an WPF application

To illustrate te problem, I've added screenshots:
http://img860.imageshack.us/i/beforeg.jpg/
You See the application waiting for a PDF File to merge/waiting for an order. The memory use is low.

http://img23.imageshack.us/i/before1e.jpg/
Still waiting for an order. here you see the memory use of the application


http://img856.imageshack.us/i/aftero.jpg/
You see the application has a outofmemoryexeption . The memory usage is high

http://img690.imageshack.us/i/after2l.jpg/
You see the application has a outofmemoryexeption . The memory usage is high

The screenshots show the memory flows on the server.


greetz

Global memory usage goes up from 39 % to 50 %.
And your application is 32 bit, so it's limited to 2 GB.

50 % server memory free, but your app gets an OutOfMemory exception.

AFAIK you can use both GDI+ and WPF builds of PDFsharp with console application.

So first step: build a 64 bit version of your app and try that.
Second step: switch from GDI+ to WPF or vice versa to see if that makes a difference.

_________________
Regards
Thomas Hoevel
PDFsharp Team