Windows 10 VM CPU percentage at idle? (post your numbers)

Discussion in 'Windows Guest OS Discussion' started by BAT77, Aug 12, 2018 at 12:26 AM.

  1. BAT77

    BAT77 Bit Poster

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    Hi everyone! Q: What percentage of of your CPU does Windows 10 VM use at idle (viewed in Activity Monitor)? [Please also state your Mac model, OS, and whether your Windows 10 is a disk image or installed in a Boot Camp partition.]

    I am running Windows 10 Education VM installed on a Boot Camp partition using Parallels 13 on a 2015 MacBook Pro 15-inch (2.5 GHz) with High Sierra. My dilemma: At idle Windows 10 shows a total of 3% CPU usage in (Windows) Task Manager but a whopping 25% under (Mac) Activity Monitor. I have allocated the recommended number of CPU cores, memory, etc. to Windows 10.

    In contrast: My Windows 10 Education VM on my 2013 Mac Pro (6-core 3.5 GHz--the "trashcan" model), also installed on Boot Camp, shows only about 5% CPU utilization in Activity Monitor. (All settings are recommended--the same as on the MacBook Pro.)

    Looking forward to the results. Thanks!
     
    Last edited: Aug 12, 2018 at 12:35 AM
  2. RogerH6

    RogerH6 Bit Poster

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    On mine it is currently varying between 0.3 and 0.5%.
    Windows fluctuates between 0% and 1%.
    i7 4GHz 32GBRAM.
    How much RAM do you have?. One 'drinker' would be if things were swapping.
     
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  3. BAT77

    BAT77 Bit Poster

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    Thanks for your reply, RogerH6. I have 16 GB RAM on the MacBook Pro. What is your macOS? And are you running Windows 10 off of Boot Camp or as a disk image?
     
  4. RogerH6

    RogerH6 Bit Poster

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    Disk image. 10.13.6 on the Mac, and running 1803 on the Windows.
    There was a spate of threads about high CPU usage (resulting in Mac's running hot), when Parallels 12 launched.
    If I remember two culprits. Chrome, and one particular anti-virus.
    I think he key was that certain things resulted in the Mac OS doing all the actual 'work' and if you were running something that triggered these, it gave the odd asymmetry between the reported readings.
     
  5. BAT77

    BAT77 Bit Poster

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    Roger, thanks for your response. I'm amazed at how low your CPU usage on Activity Monitor is for your Boot Camp Windows 10 VM. I would expect low numbers running off a disk image, but I am surprised that the percentage is actually lower in Activity Monitor than in Windows. I would expect the opposite.
    As far as CPU-sucking culprits go, I don't have Chrome installed and no anti-virus other than Windows Defender.
    I did a remote session with Parallels tech support but the representative is still puzzled as to the culprit. He is doing some internally investigation and will get back to me.
    Thanks again for your replies.
     
  6. RogerH6

    RogerH6 Bit Poster

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    The Windows I'm running is only setup to use 4 CPU cores. So half the processor is unused by the virtual machine.
    This gave me huge problems when registering Windows (I had set i up in BootCamp which had all 8 cores in use, then went to use this inside the Mac environment with only 4 cores, and Windows complained it wasn't registered - MS let me re-register after a phone call and it now accepts both configurations).
     
    Last edited: Aug 17, 2018 at 6:53 AM
  7. EmmanuelO1

    EmmanuelO1 Bit Poster

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    Interesting thread, I was also wondering.
    I'm using Parallels 13 on a Macbook Pro 13 2018 with an i7 4 cores.
    Windows Pro x64 build 1803 in a VM.
    I get 3-4% in Windows on idle, and 15-25% on the mac for the VM. No idea why.
    There is no app running in the VM, as confirmed in the task manager.
     
  8. RogerH6

    RogerH6 Bit Poster

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    That is interesting. So you are effectively seeing the same thing. I wonder if the behaviour is specific to having the VM using all the cores?. If you think about it this potentially could mean delays in servicing things on the host OS. My low Windows percentage may be because I have everything turned off (no animations, Cortama etc..).
     
  9. EmmanuelO1

    EmmanuelO1 Bit Poster

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    Not using all cores here, two for Mac OS, two for the VM. I'm usjng the parallels hypervisor but not the adaptive one. Are you using it? Indisabled it because it causes issue with a specific software, but it could be part of the difference. I'm away this week-end but I'll trybwhen I'm back.
     
  10. RogerH6

    RogerH6 Bit Poster

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    The poster is talking running the VM from a BootCamp setup. With this, you normally have to set the VM to use the same settings as are set for the BootCamp, otherwise Windows complains that the hardware has changed and it is not registered (that was the fun I had getting this to work...).
    I'm using the adaptive hypervisor.
     
  11. EmmanuelO1

    EmmanuelO1 Bit Poster

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    The poster is running from bootcamp but asked for numbers for bootcamp or disk image users.

    I use bootcamp as a separate installation. It also kept asking me to reregister windows or office when I was trying to also run it as a VM, so I stopped doing that a long time ago.
     

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