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  2. Commit charge - Wikipedia

    en.wikipedia.org/wiki/Commit_charge

    In the same display, the "Mem Usage" column in Windows XP and Server 2003, or the "Working Set (Memory)" column in Windows Vista and later, shows each process's current working set. This is a count of physical memory (RAM) rather than virtual address space. It represents the subset of the process's virtual address space that is valid, meaning ...

  3. Virtual memory compression - Wikipedia

    en.wikipedia.org/wiki/Virtual_memory_compression

    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 ...

  4. Intel 5-level paging - Wikipedia

    en.wikipedia.org/wiki/Intel_5-level_paging

    4-level paging of the 64-bit mode. In the 4-level paging scheme (previously known as IA-32e paging), the 64-bit virtual memory address is divided into five parts. The lowest 12 bits contain the offset within the 4 KiB memory page, and the following 36 bits are evenly divided between the four 9 bit descriptors, each linking to a 64-bit page table entry in a 512-entry page table for each of the ...

  5. Virtual memory - Wikipedia

    en.wikipedia.org/wiki/Virtual_memory

    Virtual memory combines active RAM and inactive memory on DASD [a] to form a large range of contiguous addresses.. In computing, virtual memory, or virtual storage, [b] is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" [3] which "creates the illusion to users of a very large (main) memory".

  6. Memory paging - Wikipedia

    en.wikipedia.org/wiki/Memory_paging

    Windows 95, Windows 98 and Windows Me use a similar file, and the settings for it are located under Control Panel → System → Performance tab → Virtual Memory. Windows automatically sets the size of the page file to start at 1.5× the size of physical memory, and expand up to 3× physical memory if necessary.

  7. Thrashing (computer science) - Wikipedia

    en.wikipedia.org/wiki/Thrashing_(computer_science)

    Thrashing is when the CPU performs 'productive' work less and 'swapping' work more. The overall memory access time may increase since the higher level memory is only as fast as the next lower level in the memory hierarchy. [2] The CPU is busy swapping pages so much that it cannot respond to users' programs and interrupts as much as required.

  8. 2 GB limit - Wikipedia

    en.wikipedia.org/wiki/2_GB_limit

    The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux , although some variants of the latter can overcome this barrier. [ 2 ]

  9. Memory overcommitment - Wikipedia

    en.wikipedia.org/wiki/Memory_overcommitment

    The disadvantage of this approach is that memory swap files are slower to read from than 'actual' memory, which can lead to performance drops. [2] Another disadvantage is that, when running out of real memory, the system is relying on the applications to not use the additional memory despite it being allocated to them.