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Editorial Team
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Asked: 2026-05-26T18:39:54+00:00

This is an interesting one. First of all the setup: 8GB RAM Windows 7

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This is an interesting one. First of all the setup:

  • 8GB RAM
  • Windows 7 Pro x64
  • VS2010 Ultimate

I have a memory intensive algorithm that crunches through data using LINQ/PLINQ. The initial implementation relied on PLINQ. A unit test succeeds. But remarkably while trying to see what kind of performance benefits I am getting from using PLINQ vs. LINQ, the same test fails with OutOfMemoryException when parallelism is disabled.

Is there any reasonable explanation? I can consistently reproduce that. I didn’t check but could I be running out not memory but some resources instead which are allocated differently depending on threading model? Ideas?

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1 Answer

  1. Editorial Team

    A single Object in .net is limited to 2 GB, even on 64-Bit. If you are not using PLINQ I would guess that some object (for example, a List) is getting bigger than 2 Gigabytes and thus crashes. With PLINQ – since it splits its work – I would guess that it creates multiple Lists that are all under 2 GB.

    Please post some code, without it it’s impossible to give any details.

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