Question about shared memory

Hello!

I have a virtual machine that is configured with 1 GB of RAM and installed with Windows Server 2003. Shortly after starting the virtual machine, the info of the allocation of resources on the memory usage indicates the following:

While the Task Manager Windows VM shows the following:

While the use of the memory of the VM on the host is only 264 MB, why the use of the memory of comments displays 787 MB shared memory? The virtual machine is the only VM running on this host. If I understand correctly, "Shared memory" would theoretically show the amount of memory shared with other virtual machines on this host. For example, let's say I had two W2K3 VMs on that host with 1 GB of RAM each, the counter shared memory would report to the amount of memory that is the same for both these virtual machines and so physically shared. However, since there is no other virtual computer running on this host I don't really understand why he reports 787 MB!  It seems to me that the value of the shared memory is unused memory in fact (since the task inside the guest Manager reports only about 150 MB use and the virtual machine does not seem to consume the 264 MB mentioned on the host).

Any ideas what I'm missing? Thank you!

As you say

  • The virtual computer is configured with 1024 MB of RAM

  • The private memory usage is 237 MB

  • Shared memory is 787 MB

All Windows VMs zero start pages is that they fill all memory with zeros. So VMKernel identifies all pages from scratch can be shared to one. In your scenario THAT VM wrote zeors 1024Mo and out of which 787 MB is shared and still 237 is used which further can be shared. 787 MB shared memory means that it the memory saved with page sharing and memory amount can be used by other processes.

I hope this helps.

Thank you.

Tags: VMware

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