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Virtual machine -- how does it work



 
 
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  #16  
Old July 19th 17, 07:45 AM posted to alt.windows7.general
Char Jackson
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Posts: 10,449
Default Virtual machine -- how does it work

On Tue, 18 Jul 2017 20:08:53 +0100, "J. P. Gilliver (John)"
wrote:

In message , Char Jackson
writes:
[]
I'm not sure how that works, so I hope someone with experience of such
things might tell me.

Does it mean you have to boot twice, to run one OS on top of another?

If so, what effect does it have on boot time?


1. You would boot the laptop as you always do.
2. You would launch the host, or hypervisor, program.
3. Within that program, you would boot the VM.

So yes, there are two boots in that sequence.


Once you've done the first boot, can a VM system be saved in current
condition, rather like hybernating, or do you have to boot it every time
you want to use it?
[]


I use VMware Workstation and it allows me to 'pause' and "resume" any of
my VMs, with each of those operations taking about 3-5 seconds. The time
probably depends on a few things, such as amount of allocated RAM. Mine
are generally small, just big enough to meet a specific purpose, so
about 2GB to 4GB of allocated memory for each.

Of course, I can also shut them down and boot them up, but as expected
that takes a lot longer. I only shut a VM down when I need to adjust one
or more of its parameters, such as the amount of RAM allocated.

I frequently go into a meeting in a conference room where I'll need to
demonstrate something using 4 VMs, so I click 4 times to resume the 4
VMs, and in the time it takes me to reach over and grab the video cable
that I'm going to be using, the 4 VMs are up and stable. At the end of
the meeting, frequently the next group of people are piling into the
room and there wouldn't be time for an orderly shutdown of 4 VMs, so the
pause feature works really well. I click pause 4 times, and as I reach
down to grab my laptop case, the VMs go to sleep and I can close the lid
of my laptop. It's very fast and very slick.

--

Char Jackson
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  #17  
Old July 19th 17, 08:02 PM posted to alt.windows7.general
Mark Lloyd[_2_]
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Posts: 1,756
Default Virtual machine -- how does it work

On 07/18/2017 09:02 AM, Brian Gregory wrote:

[snip]

For 16 bit Windows programs a virtual machine running 32 bit Windows is
the only way I know.


Unless you have an actual older machine running older Windows (or, of
course, DOS).

I have such a machine. The CPU is a Pentium II class Celeron. The
motherboard is marked "Y2K compliant" (once I never thought "Y2K
compliant" would mean really old).

--
Mark Lloyd
http://notstupid.us/

"COFFEE.EXE Missing - Insert Cup and Press Any Key to continue."
  #18  
Old July 20th 17, 08:17 AM posted to alt.windows7.general
Steve Hayes[_2_]
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Posts: 1,089
Default Virtual machine -- how does it work

On Tue, 18 Jul 2017 15:02:04 +0100, Brian Gregory
wrote:

For DOS programs when using 64 bit Windows DOSBOX is likely to be the
best solution. Exceptions are possibly a few DOS games that need a lot
of CPU power. It's an emulation rather than a virtual machine.

https://www.dosbox.com/


Yes, I use that for programs written in TurboPascal, which can't cope
with high-speed processors.

But it seems that getting a 32-bit version of Windows would be
preferable for the other programs I use.


--
Steve Hayes
http://www.khanya.org.za/stevesig.htm
http://khanya.wordpress.com
 




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