~30% host CPU usage when guest Windows 7 x32 VM is at ~2%

Discussion in 'Windows Guest OS Discussion' started by LeVeL5, May 6, 2015.

  1. LeVeL5

    LeVeL5 Bit Poster

  2. Dhruba@Parallels

    Dhruba@Parallels Kilo Poster

    Hi LeVeL5,
    Please try creating an empty Virtual Machine and check the CPU usages. Refer to this article, http://kb.parallels.com/121578
    Note: This article is also applicable for Parallels Desktop 10.
    Last edited: May 8, 2015
  3. LeVeL5

    LeVeL5 Bit Poster

    Hi Dhruba,

    No, it takes the same 30%~35% of CPU.

    Screen Shot 2015-05-07 at 9.00.33 AM.png Screen Shot 2015-05-07 at 9.00.57 AM.png
  4. PaulChris@Parallels

    PaulChris@Parallels Product Expert Parallels Support

    Hi LeVeL5,
    The reason why numbers are different is that Mac and Windows calculate CPU consumption in 2 different ways:
    • In Windows: No matter how many CPUs you have, if you have (for example) 6 CPUs installed, the total consumption of all 6 CPU resources will equal 100%.
    • In Mac: Multiply the number of CPUs you have by 100%. For example if you have 6 CPUs installed, the total consumption on Mac will equal 600%.
    Some of the CPU power on the Mac side is also used for visualization purposes.
    Please refer to this article to know about CPU consumption: http://kb.parallels.com/112764

    Paul Chris

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