Memory leak in Windows?

Discussion in 'Windows Guest OS Discussion' started by koppah, Apr 18, 2021.

  1. koppah

    koppah Bit Poster

    Messages:
    58
    When running Windows ARM in Parallels, I'm seeing the system bounce up to 100% memory usage and stay there, then come back and immediately jump back up, even with no apps running. This is causing Windows to slow to a crawl, and I can see that the Parallels Desktop process in MacOS is using over 12GB of memory, even though my system only has 8GB. Additionally, this happens if I increase the VM's allowed memory from 4GB to 6GB.
    It seems like there may be a Parallels driver that's leaking a lot of memory in Windows and causing it to run terribly.
     
  2. Michael Pitt

    Michael Pitt Bit Poster

    Messages:
    47
    I've got the same issue. Just created a new VM and memory was fine - installed Parallels Tools and it's back at 95%. No apps or anything else installed, so definitely looks like a driver issue.
     
  3. koppah

    koppah Bit Poster

    Messages:
    58
    Glad that I'm not the only one seeing this!
     
  4. koppah

    koppah Bit Poster

    Messages:
    58
    Was the VM usable without Parallels Tools? I tried uninstalling and the experience isn't great...
     
  5. Rob Grayson

    Rob Grayson Bit Poster

    Messages:
    24
    Just noticed the exact same thing here. M1 MacBook Pro with 16 GB of memory, of which 6 GB is allocated to the Windows 10 ARM VM. The macOS Activity Monitor shows Parallels Desktop using around 160 MB, while Windows 10 is shown as using 12.39 GB!!
     
  6. Rob Grayson

    Rob Grayson Bit Poster

    Messages:
    24
    Update: with 6 GB of memory assigned to the Win10 ARM VM, Activity Monitor said Win10 was using 12.39 GB of memory. If I reduce the amount of memory assigned to the VM to 5 GB, Win10 memory usage according to Activity Monitor falls to around 10 GB; if I reduce it 4 GB, Win10 memory usage falls to... you guessed it, around 8 GB.
    So it seems Activity Monitor is reporting Windows 10 as using approximately twice the amount of memory assigned to it.
     

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