![]() ![]() These do not show how much has actually been written to the pagefile, but only the maximum potential pagefile usage: The amount of pagefile that would be used if all current contents of RAM had to be removed. The height of the graph area corresponds to the commit limit. In the Task Manager utility under Windows XP and Windows Server 2003, the graphical displays labeled as "PF usage" and "Page File Usage History," despite their labels, reflect not the pagefile contents but the total (or current) commit charge. It will also change when already-running programs allocate or free private virtual memory for example, with the VirtualAlloc and VirtualFree APIs. The commit charge increases when any program is opened and used, and goes down when a program is closed. The program Process Explorer reports the same set of values, labeling the Total as Current, and additionally providing percentages of Peak and Current towards the Limit value. Peak is the highest amount that the total commit charge has reached since the operating system was last started.The corresponding performance counter is called "Commit Limit". Limit is the maximum possible value for Total it is the sum of the current pagefile size plus the physical memory available for pageable contents (this excludes RAM that is assigned to non-pageable areas).The corresponding performance counter is called "Committed Bytes". ![]() This is composed of main memory (RAM) and disk (pagefiles). Total is the amount of pagefile-backed virtual address space in use, i.e., the current commit charge.The Windows Task Manager utility for Windows XP and Server 2003, in its Performance tab, shows three counters related to commit charge: Virtual memory not related to commit charge includes virtual memory backed by files and all-zero pages backed by nothing. As a percentage, commit charge is the utilization of this limit. Through the process of paging, the contents of this virtual memory may move between physical memory and the page file, but it cannot exceed the sum of sizes of those two. In computing, commit charge is a term used in Microsoft Windows operating systems to describe the total amount of virtual memory of all processes that must be backed by either physical memory or the page file. ( Learn how and when to remove this template message) ( December 2011) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations. ![]()
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