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How does Memory allocation in VPC 2007 64bit on 64bit OS work?

Source: microsoft.public.virtualpc
Sent: 11/22/2008
From: Andrew Meador <(email address - cut out)>
Message:

I am considering building a new system and I'm trying to put
together specs. I'm inclined to build a system with Intel Quad Core
with either XP Pro 64 or Vista 64 and 8GB RAM. I want to run multiple
VMs in VPC. Since VPC 2007 has a 64 bit version, will it access all
available memory for allocation to guest OSs? For example, can I put
8GB RAM in the host machine, run 4-32bit guest OSs with 1.5GB
allocated to each? I know each 32bit OS could use the 1.5GB of memory,
but that would hinge of VPC 2007 using a total of 6GB of RAM to
distribute out to the VM's. Will this work? I have some stuff that
could really benefit from giving the guest OS's at least 1GB of RAM
and I would like to have them all running at times, while still
allowing a good bit of RAM to stay open to the host OS. The only way I
can see how to do that is with more than 4GB of RAM - thus the whole
64 bit route.

Thanks in adavance!

Andrew

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Related Messages

Re: How does Memory allocation in VPC 2007 64bit on 64bit OS work?

Sent: 11/22/2008
From: "Steve Jain [MVP]" <(email address - cut out)>
Message:

On Sat, 22 Nov 2008 13:38:24 -0800 (PST), Andrew Meador
<(email address - cut out)> wrote:

Yes, you can run your 4 VMs with 1.5GB each with a 64bit OS and VPC.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/

Show quoted text

> I am considering building a new system and I'm trying to put
>together specs. I'm inclined to build a system with Intel Quad Core
>with either XP Pro 64 or Vista 64 and 8GB RAM. I want to run multiple
>VMs in VPC. Since VPC 2007 has a 64 bit version, will it access all
>available memory for allocation to guest OSs? For example, can I put
>8GB RAM in the host machine, run 4-32bit guest OSs with 1.5GB
>allocated to each? I know each 32bit OS could use the 1.5GB of memory,
>but that would hinge of VPC 2007 using a total of 6GB of RAM to
>distribute out to the VM's. Will this work? I have some stuff that
>could really benefit from giving the guest OS's at least 1GB of RAM
>and I would like to have them all running at times, while still
>allowing a good bit of RAM to stay open to the host OS. The only way I
>can see how to do that is with more than 4GB of RAM - thus the whole
>64 bit route.
>
> Thanks in adavance!
>
>Andrew

Re: How does Memory allocation in VPC 2007 64bit on 64bit OS work?

Sent: 02/10/2009
From: Sjoerd
Message:

Steve,

I run 64bits Vista on a system with 8gb memory. I Installed VPC2007-64. I
still can't run 3 vpc with 2gb allocated to each vpc... Why is this, do you
know?

Kind regards,
Sjoerd

"Steve Jain [MVP]" wrote:

Show quoted text

> On Sat, 22 Nov 2008 13:38:24 -0800 (PST), Andrew Meador
> <(email address - cut out)> wrote:
>
> > I am considering building a new system and I'm trying to put
> >together specs. I'm inclined to build a system with Intel Quad Core
> >with either XP Pro 64 or Vista 64 and 8GB RAM. I want to run multiple
> >VMs in VPC. Since VPC 2007 has a 64 bit version, will it access all
> >available memory for allocation to guest OSs? For example, can I put
> >8GB RAM in the host machine, run 4-32bit guest OSs with 1.5GB
> >allocated to each? I know each 32bit OS could use the 1.5GB of memory,
> >but that would hinge of VPC 2007 using a total of 6GB of RAM to
> >distribute out to the VM's. Will this work? I have some stuff that
> >could really benefit from giving the guest OS's at least 1GB of RAM
> >and I would like to have them all running at times, while still
> >allowing a good bit of RAM to stay open to the host OS. The only way I
> >can see how to do that is with more than 4GB of RAM - thus the whole
> >64 bit route.
> >
> > Thanks in adavance!
> >
> >Andrew
>
> Yes, you can run your 4 VMs with 1.5GB each with a 64bit OS and VPC.
>
> --
> Cheers,
> Steve Jain, Virtual Machine MVP
> http://vpc.essjae.com/
>

Re: How does Memory allocation in VPC 2007 64bit on 64bit OS work?

Sent: 02/10/2009
From: "Steve Jain [MVP]" <(email address - cut out)>
Message:

On Tue, 10 Feb 2009 11:35:10 -0500, "Bob Campbell" <(email address - cut out)>
wrote:

Bob's got good points. I know this has come up with a couple other
people before not being able to run 3 VMs similarly configured.
I think Bob's on the right track.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/

Show quoted text

>"Sjoerd" <(email address - cut out)> wrote in message
>news:(email address - cut out)...
>> Steve,
>>
>> I run 64bits Vista on a system with 8gb memory. I Installed VPC2007-64. I
>> still can't run 3 vpc with 2gb allocated to each vpc... Why is this, do
>> you
>> know?
>
>I just tried this. I also have Vista 64 and 8 GB. I got an error saying
>there was not enough memory when starting the 3rd VM. I dropped it down to
>1.5 GB and tried again. It started OK. I then changed it back to 2 GB
>and started it again. It worked again, and I am showing 8190 total, 1040
>cached and 0 free.
>
>What do you have running on your host? Your memory may be fragmented. I
>assume VPC wants to allocate a continuous block of RAM for the VM. You may
>not have a single 2 GB block available for the 3rd VM. I must not have had
>a single 2 GB block either, even though I was showing plenty of RAM
>available. Starting it first with 1.5 GB must have dumped enough stuff
>from cache that everything got rearranged in RAM, so I then had a single 2
>GB block available.
>
>All of the above is pure speculation on my part. However, I now have 3
>VMs running, each with 2 GB RAM - 2 XP and 1 Win 7, so it CAN be done.

Re: How does Memory allocation in VPC 2007 64bit on 64bit OS work?

Sent: 02/10/2009
From: "Bob Campbell" <(email address - cut out)>
Message:

"Sjoerd" <(email address - cut out)> wrote in message
news:(email address - cut out)...

I just tried this. I also have Vista 64 and 8 GB. I got an error saying
there was not enough memory when starting the 3rd VM. I dropped it down to
1.5 GB and tried again. It started OK. I then changed it back to 2 GB
and started it again. It worked again, and I am showing 8190 total, 1040
cached and 0 free.

What do you have running on your host? Your memory may be fragmented. I
assume VPC wants to allocate a continuous block of RAM for the VM. You may
not have a single 2 GB block available for the 3rd VM. I must not have had
a single 2 GB block either, even though I was showing plenty of RAM
available. Starting it first with 1.5 GB must have dumped enough stuff
from cache that everything got rearranged in RAM, so I then had a single 2
GB block available.

All of the above is pure speculation on my part. However, I now have 3
VMs running, each with 2 GB RAM - 2 XP and 1 Win 7, so it CAN be done.

Show quoted text

> Steve,
>
> I run 64bits Vista on a system with 8gb memory. I Installed VPC2007-64. I
> still can't run 3 vpc with 2gb allocated to each vpc... Why is this, do
> you
> know?

Post Reply | This is Spam! | Mark as Spam

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