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    <p>It is provided so that the GC knows the true cost of the object during collection. If the object is actually bigger than the managed size reflects, it may be a candidate for quick(er) collection.</p> <p>Brad Abrams <a href="http://blogs.msdn.com/brada/archive/2003/12/12/50948.aspx" rel="noreferrer">entry</a> about it is pretty clear:</p> <blockquote> <p>Consider a class that has a very small managed instance size but holds a pointer to a very large chunk of unmanaged memory. Even after no one is referencing the managed instance it could stay alive for a while because the GC sees only the managed instance size it does not think it is “worth it” to free the instance. So we need to “teach” the GC about the true cost of this instance so that it will accurately know when to kick of a collection to free up more memory in the process.</p> </blockquote>
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    1. POWhat is the point of using GC.AddMemoryPressure with an unmanaged resource?
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    1. USSteven Lyons
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    1. COActually, now that I re-read your post I my question stands still. After I use my bitmap, I will call dispose on it, so it actually will only take 8 bytes of memory. If in the other hand, I did not call dispose, well, then it really ocuppies 2mb of memory. There's the 3rd case of where there isn't a dispose method, so the GC can do nothing for it. So, the GC knowing the real size of the type will only help in situation 2. Or am I missing something?
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    2. COIn case 1, you will want to call GC.AddMemoryPressure on bitmap allocation and then GC.RemoveMemoryPressure when you manually release the bitmap. That will ensure that the object correctly reflects its size to the GC. However, if there is a way to be sure that the GC is never run while your object is eligible for collection and the bitmap is allocated, these methods might not matter.
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    3. COWell, in case one, I could do it, but it'd make no big difference, as the GC wouldn't be able to do a thing about my type, if I understand this correctly: 1) I'd declare my variable, 8 managed bytes, 2mb unmanaged bytes. I'd then use it, call dispose, so unmanaged memory is freed. Right now it will only ocuppy 8 bytes. Now, to my eyes, having called in the beggining AddMemoryPressure and RemoveMemoryPressure at the end wouldn't have made anything different. What am I getting wrong? Sorry for being so anoying about this.
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