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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. In Windows 2000 and Windows NT 4.0, these same displays are labeled "Mem usage" but again actually show the commit charge and commit limit.
Pages in the page cache modified after being brought in are called dirty pages. [5] Since non-dirty pages in the page cache have identical copies in secondary storage (e.g. hard disk drive or solid-state drive), discarding and reusing their space is much quicker than paging out application memory, and is often preferred over flushing the dirty pages into secondary storage and reusing their space.
PageDefrag runs on Windows NT 4.0, Windows 2000, Windows XP, and Windows Server 2003. Though the website erroneously [ 1 ] says "runs on Windows XP (32-bit) and higher (32-bit), Windows Server 2003 (32-bit) and higher (32-bit)", the tool cannot defragment the pagefile on Windows Vista, Windows 7, or Server 2008; it is able to defragment ...
This support for larger pages (known as "huge pages" in Linux, "superpages" in FreeBSD, and "large pages" in Microsoft Windows and IBM AIX terminology) allows for "the best of both worlds", reducing the pressure on the TLB cache (sometimes increasing speed by as much as 15%) for large allocations while still keeping memory usage at a reasonable ...
In computer operating systems, memory paging (or swapping on some Unix-like systems) is a memory management scheme by which a computer stores and retrieves data from secondary storage [a] for use in main memory. [1]
In computing, a page fault is an exception that the memory management unit (MMU) raises when a process accesses a memory page without proper preparations. Accessing the page requires a mapping to be added to the process's virtual address space.
By reducing the I/O activity caused by paging requests, virtual memory compression can produce overall performance improvements. The degree of performance improvement depends on a variety of factors, including the availability of any compression co-processors, spare bandwidth on the CPU, speed of the I/O channel, speed of the physical memory, and the compressibility of the physical memory ...
This frequently leads to high, runaway CPU utilization that can grind the system to a halt. In modern computers, thrashing may occur in the paging system (if there is not sufficient physical memory or the disk access time is overly long), or in the I/O communications subsystem (especially in conflicts over internal bus access ), etc.