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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / System.OutOfMemoryExce...
Microsoft Dynamics AX (Archived)

System.OutOfMemoryException: Array dimensions exceeded supported range.

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I have a service which recursively creates a large array of objects. When i run this code in client, it works fine, but when i pass it off to the aos to execute as a batch using sysop framework i get this error

System.OutOfMemoryException: Array dimensions exceeded supported range.at System.Collections.Generic.List`1.set_Capacity(Int32 value) at System.Collections.Generic.List`1.EnsureCapacity(Int32 min) at System.Collections.Generic.List`1.Add(T item) 

at Microsoft.Dynamics.Ax.Xpp.Array.arrayValue(Int32 _index, Object _arg, Boolean isDefaultParam)

i have seen other examples of this in other .net languages. they say that you have to add a block to the app.config file to allow large arrays like this:

<configuration>
  <runtime>
    <gcAllowVeryLargeObjects enabled="true" />
  </runtime>
</configuration>

but since i dont have access to ax's app.config, what can i do? this cannot be addressed another way.

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  • Martin Dráb Profile Picture
    Martin Dráb 236,495 Most Valuable Professional on at
    RE: System.OutOfMemoryException: Array dimensions exceeded supported range.

    Your remark about gcAllowVeryLargeObjects suggests that you're trying to put more than two gigabytes of data to this single object. I would question whether your service is written in a reasonable way, because it looks like a waste of resources to me.

    Have you considered processing the data in smaller pieces or using a temporary table, to mention just two of possible approaches?

  • Community Member Profile Picture
    Community Member on at
    RE: System.OutOfMemoryException: Array dimensions exceeded supported range.

    My service performs an optimization which must first find all combinations of items from a list of items. We have accepted that it will be memory intensive. Consider this example as reference: https://www.geeksforgeeks.org/write-a-c-program-to-print-all-permutations-of-a-given-string/

    There is, as far as i know, no way to chunk this out into smaller bits since the recursion depends on the full scope of the tree being available in memory. 

    I typically agree that the first place to look is optimizing the code, but the nature of the problem requires a lot of memory to be available. So i have to return to the original request, which is to configure ax to allow the aos to run cil code with large arrays

    Thanks

    Steven

  • Martin Dráb Profile Picture
    Martin Dráb 236,495 Most Valuable Professional on at
    RE: System.OutOfMemoryException: Array dimensions exceeded supported range.

    Then you'll either have to fix the problem that you don't have access app.config, or you'll have to off-load this logic to a separate application.

    (I can't comment on whether the logic can be optimized or not, because I would need more details.)

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