MemoryStream.ToArray() gets stuck for 10 seconds

Question

I have been using MemoryStream.ToArray() for 8 years in a very hot path in our application. After .net8 upgrade from .netfreamework.V4.6.1 I realized my application gets stuck if I call MemoryStream.ToArray() function for 2 GB's of data, it does not matter if i call it 2000 times for 1 MB or 40 times for 50MB. I realized the reason behind this is that you changed the function from C++ based one to new GC.AllocateUninittializedArray<byte> one. My hot path thread waits until GC allocates a new unitialized array and I assume it takes time to collect garbage if i filled the memory for 2 GB beforehand.

Answer 1

Hi @ahmet sahgoz , Welcome to Microsoft Q&A,

Try Use TryGetBuffer().

If the MemoryStream is not resizable (MemoryStream.CanWrite == false), TryGetBuffer() provides a view without copying (if you control the MemoryStream and it does not expose unnecessary data, you can use MemoryStream.GetBuffer()):

if (memoryStream.TryGetBuffer(out ArraySegment<byte> segment))
{
    byte[] buffer = segment.Array;
    int offset = segment.Offset;
    int length = segment.Count;
}

Best Regards,

Jiale

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