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Questions tagged [large-object-heap]

The Large Object Heap (LOH) is a special type of managed heap for the automatic memory management in .NET Framework.

The Large Object Heap (LOH) is intended for storing large objects. The large objects is an object, which size is 85000 bytes or more. These features are most significant, when working with large objects and LOH:

  • Large objects are always considered part of generation 2.
  • Large objects are never compacted.
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How to detect if the large object heap is causing the out of memory exception

I'm having System.OutOfMemory exceptions in my .NET Windows Service. I'm not sure what's causing it. I suspect fragmentation in the large object heap but i'm not sure. How can I verify my hypothesis? I can use debuggers of all kinds, but what in the…
Mark
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Determine limit for large object heap programmatically

Since it is recommended to use the IDisposal pattern for large objects, I am wondering, why there seems to be no reliable way to determine the limit, up from which an object is to be considered "large"? Internally such distinction exist: the lower…
user492238
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Initialization of VM Failed

Machine Install memory : 8GB In the Jboss developer studio, while building the project or sometimes while starting the server I am getting below the exception, Error occurred during initialization of VM Could not reserve enough space for object…
Jayanand Raghuwanshi
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C# Excessive Garbage Collection - Large Strings, G2 pressure?

I'm writing a high-ish volume web service in C# running in 64-bit IIS on Win 2k8 (.NET 4.5) that works with XML payloads and does a variety of operations on small and large objects (where the large objects are mainly strings, some over 85k (so going…
user426445
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Why might the Large Object Heap grow rather than throw an exception?

In a previous question I asked possible programatic ways of maximising the largest block allocatable on the LOH. I'm still seeing the problems, but now I'm trying to get my head around why the LOH seems to grow and shrink in size, yet I'm still…
Unsliced
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Does StringBuilder in .net 4.5 have chunks larger than MaxChunkSize

In .net 4.5 CLR team has change StringBuilder class a lot. Here is the code reference for StringBuilder class. Here we can find MaxChunkSize equal to 8000 and comment above this field: // We want to keep chunk arrays out of large object heap (< 85K…
Johnny_D
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How to optimize operations with large xml files (Download/Parsing)

I have an application that needs to download over http lots (>10k) of large xml files (8-10MB), get some content in it using one xpath expression. I'm wondering how this process can be optimized. These xml files will go directly into Large Object…
vmg
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Entity Framework, binary data and LOH

I need to store quite large amount of binary data in database (MS SQL), and interact with this database via EF. Unfortunately, EF doesn't support FILESTREAM (more exactly, there's no streaming support). So, I've decided to store data in chunks.…
Dennis
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Out of memory error in large object heap (LOH)

In my vb.net application, I am making a third party API call which makes use of byte[] internally. since byte[] is huge (around 300 MB) its allocated in LOH. After the API call I call dispose of the third party object before it goes on to make…
user2504955
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Read Request.body with StreamReader can cause Large object heap when reading request in middleware .net5

Hi I'm trying to read request inside middleware but I'm facing a strange behavior when reading the (Request.Body) with stream reader ! the problem is that its take a lot of memory for a single request (max 7Mb size ) in my visual studio memory…
andrew lockwood
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Is it possible to force an object onto the large object heap (LOH) even if it does not exceed 85,000 bytes?

I have a situation where I'm allocating a large chunk of memory, but in many smaller sub-arrays. I noticed the performance is significantly worse once I pass a threshold of around 85,000 bytes per array. I'm assuming the performance drop is…
gfrung4
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Why is large object heap mostly empty?

Why does .NET memory management create such a large object heap? Most of it seems to be empty. Is this something to be concerned about? Does the below data mean that in reality I only 179 MB worth of large objects in my application? 179 MB is…
Dhwanil Shah
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C# - can a string be stored in the Large Object Heap (LOH)?

Recently I was asked in the interview, if the strings in C# can come to the LOH. The interviewer mentioned that there is some optimization in GC logic that splits a single massive string into several smaller ones, so this string never reaches LOH. I…
SvjMan
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Does GC.CollectionCount Only analyze the Generational Heap? C# .netcore

The MSDN documentation for GC.CollectionCount states: "Returns the number of times garbage collection has occurred for the specified generation of objects." Does this mean it only performs this analyzation on the Generational Heap Or Is There Some…
JohnnyStant
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CLR Profiler LOH size not matching with Object by address LOH size?

I am checking memory usage of my program using CLR profiler and i am concerned with the LOH allocation . Basically, i am allocating 10 files each of 1 mb size to an Azure data lake service file parallely ( using concurrentAppend API). Theoretically…
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