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  2. System Idle Process - Wikipedia

    en.wikipedia.org/wiki/System_Idle_Process

    In Windows 2000 and later the threads in the System Idle Process are also used to implement CPU power saving. The exact power saving scheme depends on the operating system version and on the hardware and firmware capabilities of the system in question.

  3. Usage share of operating systems - Wikipedia

    en.wikipedia.org/wiki/Usage_share_of_operating...

    In June 2016, Microsoft claimed Windows 10 had half the market share of all Windows installations in the US and UK, as quoted by BetaNews: Microsoft's Windows trends page [shows] Windows 10 hit 50 percent in the US (51 percent in the UK, 39 percent globally), while ... Windows 7 was on 38 percent (36 percent in the UK, 46 percent globally).

  4. Fragmentation (computing) - Wikipedia

    en.wikipedia.org/wiki/Fragmentation_(computing)

    Eventually, memory fragmentation may lead to complete loss of (application-usable) free memory. Memory fragmentation is a kernel programming level problem. During real-time computing of applications, fragmentation levels can reach as high as 99%, and may lead to system crashes or other instabilities.

  5. Memory refresh - Wikipedia

    en.wikipedia.org/wiki/Memory_refresh

    Memory refresh is a process of periodically ... the refresh overhead, can be calculated from the system timing: [10] ... for correct operation of the remaining 99% of ...

  6. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.

  7. Ephemeral port - Wikipedia

    en.wikipedia.org/wiki/Ephemeral_port

    In addition to the default range, all versions of Windows since Windows 2000 have the option of specifying a custom range anywhere within 1025–65535. [8] [9] 1024–5000: FreeBSD versions before 4.6, including the Berkeley Software Distribution (BSD). [10] [11] Default range of Microsoft Windows operating systems through Windows XP. [12] 1025 ...

  8. Translation lookaside buffer - Wikipedia

    en.wikipedia.org/wiki/Translation_lookaside_buffer

    A translation lookaside buffer (TLB) is a memory cache that stores the recent translations of virtual memory to physical memory. It is used to reduce the time taken to access a user memory location. [1] It can be called an address-translation cache. It is a part of the chip's memory-management unit (MMU).

  9. Garbage collection (computer science) - Wikipedia

    en.wikipedia.org/wiki/Garbage_collection...

    Stop-and-copy garbage collection in a Lisp architecture: [1] Memory is divided into working and free memory; new objects are allocated in the former. When it is full (depicted), garbage collection is performed: All data structures still in use are located by pointer tracing and copied into consecutive locations in free memory.