OutOfMemory – Large MergeDocument

[knutParticipant]

We are trying to merge a fairly complex Word document to a large number of recipients using OpenXmlPowerTools (ver 4.5.3.2). It seems like the merged document object hits the 2 GB object size limit in .Net, resulting in an OutOfMemoryException. I have set <gcAllowVeryLargeObjects enabled=”true”/>, but it doesn’t make any difference.

The exception seems to happen in the DocumentBuilder.BuildDocument method.

Is there a solution for this?

[Eric WhiteKeymaster]

There are some scenarios where the only solution is to build a 64-bit exe. I have never run out of memory when using 64-bit.

[knutParticipant]

Hi,

Thanks for your answer. Compiling for 64bit didn’t make any difference – but probably the problem is not in OpenXmlPowerTools after all.

I made a small test app, just performing the merge. It completes fine (although it takes more than 30 minutes…) on the same server where the actual “serious” application crashes, and it allocates a lot of RAM (~7GB) for the merge process.

The actual application is a server application, running standalone (OWIN) as a Windows service. The 2GB limit is probably enforced by some of the surrounding infrastructure, I am struggling to find out where.

[Author]

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