Windows Memory - OS Test

To understand the metrics reported by this test, it is essential to understand how memory is handled by the operating system. On any Windows system, memory is partitioned into a part that is available for user processes, and another that is available to the OS kernel. The kernel memory area is divided into several parts, with the two major parts (called "pools") being a nonpaged pool and a paged pool. The nonpaged pool is a section of memory that cannot, under any circumstances, be paged to disk. The paged pool is a section of memory that can be paged to disk. (Just being stored in the paged pool doesn't necessarily mean that something has been paged to disk. It just means that it has either been paged to disk or it could be paged to disk.) Sandwiched directly in between the nonpaged and paged pools (although technically part of the nonpaged pool) is a section of memory called the "System Page Table Entries," or "System PTEs." The WindowsMemory – Guest test tracks critical metrics corresponding to the System PTEs and the pool areas of kernel memory of a Windows virtual machine.

This test is disabled by default. To enable the test, go to the enable / disable tests page using the menu sequence : Agents -> Tests -> Enable/Disable, pick Hyper-V/Hyper-V VDI as the desired Component type, set Performance as the Test type, choose the test from the disabled tests list, and click on the < button to move the test to the ENABLED TESTS list. Finally, click the Update button.

Target of the test : A Hyper-V / Hyper-V VDI server

Agent executing the test : An internal agent

Output of the test : One set of results for every Windows VM guest/user on the monitored Hyper-V server

Configurable parameters for the test
Parameter Description

Test period

This indicates how often should the test be executed.

Host

Specify the HOST for which this test is to be configured.

Port

Specify the port at which the target host is listening. By default, this is NULL

Inside View Using

By default, this test obtains the “inside view” of VMs using the eG VM Agent. Accordingly, the Inside view using flag is set to eG VM Agent by default. The eG VM Agent is a piece of software, which should be installed on every VM on a hypervisor. Every time the eG agent runs this test, it uses the eG VM Agent to pull relevant 'inside view' metrics from each VM. Once the metrics are collected, the eG agent then communicates with each VM agent and pulls these metrics, without requiring administrator privileges. Refer to Configuring the Remote Agent to Obtain the Inside View of VMs for more details on the eG VM Agent.

Domain, Admin User, and Admin Password, and Confirm Password

By default, these parameters are set to none. This is because, by default, the eG agent collects 'inside view' metrics using the eG VM agent on each VM. Domain administrator privileges need not be granted to the eG agent if it uses this default approach to obtain the 'inside view' of Windows VMs.

Show Recent Websites DD

Typically, the detailed diagnosis of the Recent websites measure, if enabled, reveals the URL that is open in each browser tab of a virtual desktop. In large VDI environments supporting hundreds of virtual desktops and users, collecting and storing the details of every browser tab that a user opens can increase the strain on the eG database. To avoid this, by default, this test does not collect detailed diagnostics for the Recent websites measure. Accordingly, the Show Recent Websites DD is set to No by default. You can turn this flag on if you want, by selecting the Yes option. If this is done, then this test will collect detailed metrics for the Recent websites measure.

Report By User

For the Hyper-V monitoring model, the Report By User flag is set to No by default, indicating that by default, the guest operating systems on the Hyper-V server are identified using the hostname specified in the operating system. On the other hand, for the Hyper-V VDI model, this flag is set to Yes by default; this implies that in case of VDI servers, by default, the guests will be identified using the login of the user who is accessing the guest OS. In other words, in VDI environments, this test will, by default, report measures for every username_on_virtualmachinename.

Report Powered OS

This flag becomes relevant only if the report by user flag is set to ‘Yes’.

If the Report Powered OS flag is set to Yes (which is the default setting), then this test will report measures for even those VMs that do not have any users logged in currently. Such guests will be identified by their virtualmachine name and not by the username_on_virtualmachinename. On the other hand, if the Report Powered OS flag is set to No, then this test will not report measures for those VMs to which no users are logged in currently.

Ignore VMs Inside View

Administrators of some high security Hyper-V environments might not have permissions to internally monitor one/more VMs. The eG agent can be configured to not obtain the 'inside view' of such ‘inaccessible’ VMs using the Ignore VMs Inside View parameter. Against this parameter, you can provide a comma-separated list of VM names, or VM name patterns, for which the inside view need not be obtained. For instance, your Ignore VMs Inside View specification can be: *xp,*lin*,win*,vista. Here, the * (asterisk) is used to denote leading and trailing spaces (as the case may be). By default, this parameter is set to none indicating that the eG agent obtains the inside view of all VMs on a Hyper-V host by default.

Note:

While performing VM discovery, the eG agent will not discover the operating system of the VMs configured in the Ignore VMs Inside View text box.

Exclude VMs

Administrators of some virtualized environments may not want to monitor some of their less-critical VMs - for instance, VM templates - both from 'outside' and from 'inside'. The eG agent in this case can be configured to completely exclude such VMs from its monitoring purview. To achieve this, provide a comma-separated list of VMs to be excluded from monitoring in the Exclude VMs text box. Instead of VMs, VM name patterns can also be provided here in a comma-separated list. For example, your Exclude VMs specification can be: *xp,*lin*,win*,vista. Here, the * (asterisk) is used to denote leading and trailing spaces (as the case may be). By default, this parameter is set to none indicating that the eG agent obtains the inside and outside views of all VMs on a virtual host by default. By providing a comma-separated list of VMs/VM name patterns in the Exclude VMs text box, you can make sure the eG agent stops collecting 'inside' and 'outside' view metrics for a configured set of VMs.

Ignore WINNT

By default, the eG agent does not support the inside view for VMs executing on Windows NT operating systems. Accordingly, the Ignore WINNT flag is set to Yes by default.

Enable Memory Diagnosis

By default, theEnable Memory Diagnosis flag is set to NO, indicating that detailed diagnosis will not be available for the Free memory in VM measure reported by this test by default. If you want to view the detailed diagnosis of the Free memory in VM measure - i.e., to view the top 10 processes on the target VM that are utilizing memory excessively - you can change this flag to YES.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Free entries in system page table

Indicates the number of page table entries not currently in use by the guest.

Number

The maximum number of System PTEs that a server can have is set when the server boots. In heavily-used servers, you can run out of system PTEs. You can use the registry to increase the number of system PTEs, but that encroaches into the paged pool area, and you could run out of paged pool memory. Running out of either one is bad, and the goal should be to tune your server so that you run out of both at the exact same time. Typically, the value of this metric should be above 3000.

Page read rate in VM

Indicates the average number of times per second the disk was read to resolve hard fault paging.

Reads/sec

Page write rate in VM

Indicates the average number of times per second the pages are written to disk to free up the physical memory.

Writes/sec

Page input rate in VM

Indicates the number of times per second that a process needed to access a piece of memory that was not in its working set, meaning that the guest had to retrieve it from the page file.

Pages/sec

Page output rate in VM

Indicates the number of times per second the guest decided to trim a process's working set by writing some memory to disk in order to free up physical memory for another process.

Pages/sec

This value is a critical measure of the memory utilization on a guest. If this value never increases, then there is sufficient memory in the guest. Instantaneous spikes of this value are acceptable, but if the value itself starts to rise over time or with load, it implies that there is a memory shortage on the guest.

Memory pool non-paged data in VM

Indicates the total size of the kernel memory nonpaged pool.

MB

The kernel memory nonpage pool is an area of guest memory (that is, memory used by the guest operating system) for kernel objects that cannot be written to disk, but must remain in memory as long as the objects are allocated. Typically, there should be no more than 100 MB of non-paged pool memory being used.

Memory pool paged data in VM

Indicates the total size of the Paged Pool.

MB

If the Paged Pool starts to run out of space (when it's 80% full by default), the guest will automatically take some memory away from the System File Cache and give it to the Paged Pool. This makes the System File Cache smaller. However, the system file cache is critical, and so it will never reach zero. Hence, a significant increase in the paged pool size is a problem. This metric is a useful indicator of memory leaks in a guest. A memory leak occurs when the guest allocates more memory to a process than the process gives back to the pool. Any time of process can cause a memory leak. If the amount of paged pool data keeps increasing even though the workload on the guest remains constant, it is an indicator of a memory leak.

Committed memory in use in VM

Indicates the committed bytes as a percentage of the Commit Limit.

 

Percent

Whenever this measure exceeds 80-90%, application requests to allocate memory in the virtual memory (page file). This ratio can be reduced by increasing the Physical memory or the Page file.

Pool nonpaged failures in VM

Indicates the number of times allocations have failed from non paged pool.

Number

Generally, a non-zero value indicates a shortage of physical memory.

Pool paged failures in VM

Indicates the number of times allocations have failed from paged pool.

Number

A non-zero value indicates a shortage of physical memory.

Copy read hits in VM

Indicates what percent of read I/O being served is coming from system cache, not disk.

Percentage

This is an important counter for applications like the Citrix Provisioning server that stream large volumes of data. If the RAM cache of the server is not sufficiently large, a lot of the I/O requests will be served from the disk, and not the system cache. This will reduce performance. Hence, it is critical to monitor this metric. The higher the value, the better the performance you can see from the server.

Copy reads in VM

Indicates the number of hits that you are really getting per second.

Reads/sec

A copy read is a file read operation that is satisfied by a memory copy from a page in the cache to the application's buffer. The LAN redirector uses this method for retrieving information from the cache, as does the LAN server for small transfers. This method is also used by the disk file systems.

Page fault rate in VM

Indicates the number of page faults occurred per second.

 

Faults/sec