On the other hand, both of these options have a more prominent effect on the guest OS. Unlike a physical machine, however, it uses no extra battery power, RAM, or CPU cycles to do so Parallels unloads it from RAM and stores it purely on the hard disk (think of it closer to a Windows laptop "hibernating" than "sleeping"). When suspending, it works just like a physical Windows machine: it saves the current state of the operating system for later use. Rather, they only affect how the guest OS will boot next time - (i.e. Shutting Down in Parallels a) How it affects the host OSīoth options do not affect the host operating system - in your case, OS X - from a resource usage standpoint. Are there any good rules of thumb about whether or when to suspend the virtual machine?ġ) Suspending vs.Does running a virtual machine running in Parallels on OSX use additional CPU or other resources over and beyond the CPU usage indicated in Activity Monitor? For example does it reserve cores?.However, I'm worried that I'm missing something. There is also some small background CPU usage if you don't shut it down. So my initial conclusion is that if you are short on ram, then suspending or shutting down the virtual OS is a good idea. In addition, when Parallels was running with a virtual machine runnning or not, it used around 200 MB and about 0.5% of cpu. When Windows 7 was suspended or turned off the process disappeared completely.When idle the Windows 7 virtual machine prl_vm_app was using around 2GB of ram and 2 to 2.5% of CPU.Using the activity monitor, I noticed the following: (c) Quit parallels completely Initial observations Ultimately, I'm interested in whether it is best when Windows 7 in parallels is not in active use, to: I'm curious under what conditions I will experience a performance hit either in terms of CPU usage. I have it configured to use 2GM ram and 2 cores on a Retina MacBook Pro with 8GB ram. I run Windows 7 using Parallels in host operating system OSX.
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