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    <p>You might find some explaination in <a href="http://blogs.msdn.com/ntdebugging/archive/2007/10/10/the-memory-shell-game.aspx" rel="nofollow noreferrer">The Memory Shell Game</a></p> <p><strong>Working Set</strong> (A) – This is a set of virtual memory pages (that are committed) for a process and are located in physical RAM. These pages fully belong to the process. A working set is like a "currently/recently working on these pages" list.</p> <p><strong>Virtual Memory</strong> – This is a memory that an operating system can address. Regardless of the amount of physical RAM or hard drive space, this number is limited by your processor architecture. </p> <p><strong>Committed Memory</strong> – When an application touches a virtual memory page (reads/write/programmatically commits) the page becomes a committed page. It is now backed by a physical memory page. This will usually be a physical RAM page, but could eventually be a page in the page file on the hard disk, or it could be a page in a memory mapped file on the hard disk. The memory manager handles the translations from the virtual memory page to the physical page. A virtual page could be in located in physical RAM, while the page next to it could be on the hard drive in the page file.</p> <p>BUT: PF (Page File) Usage - This is the total number of committed pages on the system. It does not tell you how many are actually written to the page file. It only tells you how much of the page file would be used if all committed pages had to be written out to the page file at the same time.</p> <p>Hence B > A...</p> <p>If we agree that B represents "mem usage" or also PF usage, the problem comes from the fact it actually represents <a href="http://www.aumha.org/win5/a/xpvm.htm" rel="nofollow noreferrer"><strong><em>potential</em></strong> page usages</a>: in Xp, this potential file space can be used as a place to assign those virtual memory pages that programs have asked for, but never brought into use...</p>
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    1. PO"Mem Usage" higher than "VM Size" in WinXP Task Manager
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    1. COThe last part of your post does not imply B > A. Rather the opposite: if total number of committed pages for a process is A and of those in physical memory is B, despite what you said, VonC, B ≤ A because pages in physical memory can only be a subset of total committed pages.
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    2. COBut the way 'Xp Task Manager' reports them, B "the memory usage", is not just the physical memory, but also page files on hard disk.
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    3. COOh. But the Task Manager help file says 'Mem Usage' is the working set, and if I'm not wrong, working set is limited to the pages in physical memory only. But even if what you say is correct, then B = A not B > A, because A is the total committed virtual memory: pages in RAM + pages in disk.
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