Hyper-V guest OS task manager reports more memory used than expected

I have a Hyper-V node with 32 GB of system memory and 6 cores (12 logical processors with hyperthreading) running Windows Server 2012 Datacenter. On this node I have a virtual machine with 4 GB of system memory and two logical processors running Windows
Server 2008 R2 Standard.
On the virtual machine, Task Manager show that 3.62 GB of memory are being used and 109 MB are free. This is despite the fact that nothing is installed or running on the vm except the operating system. The memory usage for all processes for all
users as reported by Task Manager is under 100 MB.
Any ideas on what can be causing such a huge discrepancy between the memory usage reported by Task Manager and reality? The host OS reports 9.8 GB out of 32 GB memory usage (expected since several VMs are running on the host), but I would not think
that the guest OS would be pegged.

Busy two weeks. Sorry I didn't respond sooner.
I should clarify that I was not running Task Manager on the host machine, but rather on the guest OS. Task manager on the VM was reporting incorrect memory usage for the VM. Task Manager on the host machine was reporting correct information for
the host.
I would expect that a guest OS should have accurate metrics for its own memory usage as this is usually the case with visualization solutions (Sun VirtualBox, Citrix, VMWare). Interestingly, although TaskManager on the guest OS is reporting incorrect
(3.62 GB) memory usage, the Hyper-V Manager shows reasonable and likely correct (574 MB) memory usage. Hyper-V Manager shows 598 MB of "Assigned Memory" and 574 MB of "Memory Demand", whereas TaskManager on the guest OS shows 3.62 GB of memory used.
I would have expected Task Manager on the guest OS to show 4 GB available, 574 MB used, about 3.4 GB free.

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Ravi Narasimhan wrote:
> Is it possible to access information from the NT Task Manager; CPU load,
> memory usage, swap usage, etc. within LV? I am doing some stability testing
> and would like to record this information as VIs start and finish and as
> data are being continuously streamed to disk. Goal is to identify places
> where the CPU load gets too high, thereby risking DAQ faults and other
> side effects. Pointers to the right place(s) in TFM appreciated.
>
> Thanks,
>
> --- Ravi
> --
> Ravi Narasimhan
> Dept. of Physics and Astronomy, UCLA
> http://www.physics.ucla.edu/~oski
> [email protected]
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