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It's not so much lying as it is being difficult to give an accurate representation of it. If the same shared library is loaded by multiple apps, it's actually only loaded into memory once and then mapped into each corresponding app's address space (at least the code section ; the data and other modifiable sections are mapped COW). That consequently makes it difficult to accurately assess the true memory usage of a given app, since, if the library is being used by more than one, you can't really lay the blame for that additional memory onto any given app, hence the complex and often confusing numbers one gets as far as memory usage goes.

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