About VirtualBox

Guest OS memory uses host memory at runtime.
Stop it and it will be released.

Storage in the guest operating system uses storage on the host even if it is not running.
When you create a Virtual Box drive, you can save as much storage as you want if you specify a variable size.
Once increased, it does not automatically become smaller.

If the memory usage exceeds 90%, the guest operating system may be shut down due to lack of memory, so you should adjust it while watching the situation.

Multiple boots are fine as long as you can handle it.

"If you are ""enjoying Linux"", you can start two guests at the same time while the host is moving briskly."However, I think it is better to keep the amount used by the host.*If you move guests one by one, there will be 8G for the host, so there should be no problem.

My private PC is 16G memory.With 8G left for the hosts, we're allocating 2 guests to 4G each, and we're playing with both guests starting up.

The PC I use for work is 8G memory, so I choose 4G as my guest.We have made several guests, but only one guest will be launched at the same time.落ちる Because I'm afraid of falling.

• Just like a real PC, all allocated memory (to the guest OS) is not always used.

• Guest OS is just one of the processes from the host OS's point of view, so you can of course boot simultaneously as long as your resources allow.

• "No matter how many units you put in, if you start it alone" is generally correct.I have created about 10 guest operating systems (one boot at a time) even on a PC with 32bit=4GB memory.

• Actually, the memory of the host OS as well as the speed of access to storage is important.

Just like a real PC, all allocated memory (to the guest operating system) is not always utilized.

"Guest OS" is just one of the processes from the host OS's point of view like any other application, so you can of course boot simultaneously as long as your resources allow.

"No matter how many units you put in, if you start it alone" is generally correct.I have created about 10 guest operating systems (one at a time) on a PC with 32bit= 4GB memory.

In fact, the speed of access to storage as well as the memory of the host OS is critical.

You can also change the memory quota from the guest OS settings in VirtualBox, but you should be warned if you try to allocate about half of the actual memory (in the host OS), so you may want to refer to this as well.