Subject: Aid processing | Deadline

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You can't expect a garbage collection to occur immediately after you set null. you can, of course, force it by calling GC.Collect to see the difference.   kennyzx Feb 6 at 6:23
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If you need deterministic memory deallocation then you're using the wrong language.   Ed S. Feb 6 at 6:38
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In general, don't try to understand the garbage collection and don't mess with it.   i know nothing Feb 6 at 9:20
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FYI you are using the wrong tool; looking at total allocation in the task manager tells you almost nothing about how .NET manages memory. If you are interested in watching how the garbage collector works thenuse a .NET memory profiler. That's what it's for.   Eric Lippert Feb 6 at 17:11
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Why did this question get so much attention? Non-determinism is about the first thing one learns about the .NET GC. This must be the 1000th such question

FYI: The style of garbage collection that you describe here is calling Tracing garbage collection. An alternative would be Refcounting garbage collection, where the collector behaves exactly like @EmmettYoung expected.   Radu Murzea Feb 6 at 9:02
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@DrKoch When it reaches about 3-4 GB (depending on many factors) it will suddenly drop to near-zero. That is not deterministic either. The GC will execute a collection once its generation 0 segment is full and in needs of memory release. With a 64bit process in Server GC mode that wont necessarly happen at 4GB either  Yuval Itzchakov Feb 6 at 9:05
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@Yuval Yes, I simplified a bit, of course. Behind the scenes things are much more complicated. But I thought my explanations are helpful to get a first, general picture.   DrKoch Feb 6 at 9:07
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@Yuval My answer contains "not too much" and "a whole lot". This quantities are not accurate at all, still I think this is exactly the information helpful in such an (general, overview-type) answer.   DrKoch Feb 6 at 9:11
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@DrKoch Perhaps you could change the "about 3-4" number to something like "begins to consume a significant portion of available physical memory." It is often tempting to throw out "a million" when one really means "a lot."   Moby Disk Feb 6 at 19:15