Is there a significant issue to allocating all available cores to one VM if that is the only major task...











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I have a one-off task that requires me to use a VM to fix a build bug a software project using SCons (Python). The testing cycle is fairly short, resulting in frequent rebuilds. I'm using a 4-core laptop to host the VM and doing little else (a handful of tabs in Firefox, one terminal window for vim) aside from the work in the VM itself. I'm considering increasing the hardware allotment to the VM from 2 to 4 cores, but this would give all of my cores to the VM. Is this a terrible idea?



More info in case it matters:

VirtualBox on Ubuntu 18.04 LTS

RAM: 2GB of 8GB used according to free, 4GB allocated to the VM.
Storage: 256GB SSD (M.2)






memory virtual-machine cpu multi-core core







share|improve this question




























    up vote
    1
    down vote

    favorite












    I have a one-off task that requires me to use a VM to fix a build bug a software project using SCons (Python). The testing cycle is fairly short, resulting in frequent rebuilds. I'm using a 4-core laptop to host the VM and doing little else (a handful of tabs in Firefox, one terminal window for vim) aside from the work in the VM itself. I'm considering increasing the hardware allotment to the VM from 2 to 4 cores, but this would give all of my cores to the VM. Is this a terrible idea?



    More info in case it matters:

    VirtualBox on Ubuntu 18.04 LTS

    RAM: 2GB of 8GB used according to free, 4GB allocated to the VM.
    Storage: 256GB SSD (M.2)






    memory virtual-machine cpu multi-core core







    share|improve this question


























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I have a one-off task that requires me to use a VM to fix a build bug a software project using SCons (Python). The testing cycle is fairly short, resulting in frequent rebuilds. I'm using a 4-core laptop to host the VM and doing little else (a handful of tabs in Firefox, one terminal window for vim) aside from the work in the VM itself. I'm considering increasing the hardware allotment to the VM from 2 to 4 cores, but this would give all of my cores to the VM. Is this a terrible idea?



      More info in case it matters:

      VirtualBox on Ubuntu 18.04 LTS

      RAM: 2GB of 8GB used according to free, 4GB allocated to the VM.
      Storage: 256GB SSD (M.2)






      memory virtual-machine cpu multi-core core







      share|improve this question















      I have a one-off task that requires me to use a VM to fix a build bug a software project using SCons (Python). The testing cycle is fairly short, resulting in frequent rebuilds. I'm using a 4-core laptop to host the VM and doing little else (a handful of tabs in Firefox, one terminal window for vim) aside from the work in the VM itself. I'm considering increasing the hardware allotment to the VM from 2 to 4 cores, but this would give all of my cores to the VM. Is this a terrible idea?



      More info in case it matters:

      VirtualBox on Ubuntu 18.04 LTS

      RAM: 2GB of 8GB used according to free, 4GB allocated to the VM.
      Storage: 256GB SSD (M.2)






      memory virtual-machine cpu multi-core core




      memory virtual-machine cpu multi-core core






      share|improve this question















      share|improve this question













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      edited 2 hours ago

























      asked 4 hours ago









      user3.1415927

      106113




      106113






















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          This should not be a problem - worst case it will make your desktop sluggish. The biggest gotcha with resource allocation is oversubscribing RAM and causing the parent to swap, followed by disk IO bottlenecks in general (which can be somewhat mitigated by using an SSD)






          share|improve this answer





















          • I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
            – user3.1415927
            2 hours ago










          • Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
            – davidgo
            2 hours ago











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          1 Answer
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          active

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          active

          oldest

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          up vote
          2
          down vote



          accepted










          This should not be a problem - worst case it will make your desktop sluggish. The biggest gotcha with resource allocation is oversubscribing RAM and causing the parent to swap, followed by disk IO bottlenecks in general (which can be somewhat mitigated by using an SSD)






          share|improve this answer





















          • I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
            – user3.1415927
            2 hours ago










          • Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
            – davidgo
            2 hours ago















          up vote
          2
          down vote



          accepted










          This should not be a problem - worst case it will make your desktop sluggish. The biggest gotcha with resource allocation is oversubscribing RAM and causing the parent to swap, followed by disk IO bottlenecks in general (which can be somewhat mitigated by using an SSD)






          share|improve this answer





















          • I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
            – user3.1415927
            2 hours ago










          • Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
            – davidgo
            2 hours ago













          up vote
          2
          down vote



          accepted







          up vote
          2
          down vote



          accepted






          This should not be a problem - worst case it will make your desktop sluggish. The biggest gotcha with resource allocation is oversubscribing RAM and causing the parent to swap, followed by disk IO bottlenecks in general (which can be somewhat mitigated by using an SSD)






          share|improve this answer












          This should not be a problem - worst case it will make your desktop sluggish. The biggest gotcha with resource allocation is oversubscribing RAM and causing the parent to swap, followed by disk IO bottlenecks in general (which can be somewhat mitigated by using an SSD)







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 3 hours ago









          davidgo

          41.4k74985




          41.4k74985












          • I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
            – user3.1415927
            2 hours ago










          • Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
            – davidgo
            2 hours ago


















          • I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
            – user3.1415927
            2 hours ago










          • Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
            – davidgo
            2 hours ago
















          I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
          – user3.1415927
          2 hours ago




          I am using an SSD. Updated original question with that information. So if I keep memory allocation well within available RAM, processors are not as important? Would it be safer to allocate 3 instead of 4 processors?
          – user3.1415927
          2 hours ago












          Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
          – davidgo
          2 hours ago




          Processors are important, but you are unlikely to lick you system up by over subscribing the CPU. All of this us quite safe, and yes, allocating 3 CPUs may allow more responsiveness on the host, but it's not a big deal.
          – davidgo
          2 hours ago


















           

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