eG Monitoring
 

Measures reported by IGELOSMemoryTest

This test reports statistics related to the usage of physical memory of each of the IGEL Endpoints.

Outputs of the test :One set of results for every user_on_IGEL Endpoint

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Total_phy_mem Indicates the total physical memory of this IGEL Endpoint. MB  
Used_phy_mem Indicates the used physical memory of this IGEL Endpoint. MB The detailed diagnosis of this measure lists the name of each process, memory used by each process, percentage of memory used by each process, the name of the application and the images with args.
Free_phy_mem Indicates the free physical memory of this IGEL Endpoint. MB This measure typically indicates the amount of memory available for use by applications running on the target IGEL Endpoint.
Physical_mem_utilze Indicates the percent usage of physical memory by this IGEL Endpoint. Percent Ideally, the value of this measure should be low. While sporadic spikes in memory usage could be caused by one/more rogue processes on the IGEL Endpoint, a consistent increase in this value could be a cause for some serious concern, as it indicates a gradual, but steady erosion of valuable memory resources. If this unhealthy trend is not repaired soon, it could severely hamper the performance of the IGEL Endpoint, causing anything from a slowdown to a complete system meltdown.

You can use the detailed diagnosis of this measure to figure out which processes on the IGEL Endpoint are consuming memory excessively.
Available_phy_mem Indicates the amount of physical memory, immediately available for allocation to a process or for system use. MB Not all of the Available physical memory is Free physical memory. Typically, Available physical memory is made up of the Standby List, Free List, and Zeroed List.

When Windows wants to trim a process' working set, the trimmed pages are moved (usually) to the Standby List. From here, they can be brought back to life in the working set with only a soft page fault (much faster than a hard fault, which would have to talk to the disk). If a page stays in the standby List for a long time, it gets freed and moved to the Free List.

In the background, there is a low priority thread (actually, the only thread with priority 0) which takes pages from the Free List and zeros them out. Because of this, there is usually very little in the Free List.

All new allocations always come from the Zeroed List, which is memory pages that have been overwritten with zeros. This is a standard part of the OS' cross-process security, to prevent any process ever seeing data from another. If the Zeroed List is empty, Free List memory is zeroed and used or, if that is empty too, Standby List memory is freed, zeroed, and used. It is because all three can be used with so little effort that they are all counted as “available”.

A high value is typically desired for this measure.

This measure will be available for Windows 2008 VMs only.
Modified_mem Indicates the amount of memory that is allocated to the modified page list. MB This memory contains cached data and code that is not actively in use by processes, the system and the system cache. This memory needs to be written out before it will be available for allocation to a process or for system use.

Cache pages on the modified list have been altered in memory. No process has specifically asked for this data to be in memory, it is merely there as a consequence of caching. Therefore it can be written to disk at any time (not to the page file, but to its original file location) and reused. However, since this involves I/O, it is not considered to be Available physical memory.

This measure will be available for IGEL Endpoints hosted on Windows 2008 VMs only.
Standby_mem Indicates the amount of memory assigned to the standby list. MB This memory contains cached data and code that is not actively in use by processes, the system and the system cache. It is immediately available for allocation to a process or for system use. If the system runs out of available free and zero memory, memory on lower priority standby cache page lists will be repurposed before memory on higher priority standby cache page lists.

Typically, Standby memory is the aggregate of Standby Cache Core Bytes, Standby Cache Normal Priority Bytes, and Standby Cache Reserve Bytes. Standby Cache Core Bytes is the amount of physical memory, that is assigned to the core standby cache page lists. Standby Cache Normal Priority Bytes is the amount of physical memory, that is assigned to the normal priority standby cache page lists. Standby Cache Reserve Bytes is the amount of physical memory, that is assigned to the reserve standby cache page lists.

This measure will be available for IGEL Endpoints hosted on Windows 2008 VMs only.
Cached_mem This measure is an aggregate of Standby memory and Modified memory. MB This measure will be available for IGEL Endpoints hosted on Windows 2008 VMs only.
Max_memory_allocated Indicates the maximum amount of memory that this IGEL endpoint is allowed to use. MB This measure will be available only for those IGEL Endpoints that are provisioned from a Microsoft Hyper-V Hypervisor.
Max_memory_usage Indicates the percentage of memory that is utilized from the maximum amount of memory that this IGEL Endpoint is allowed to use. Percent This measure will be available only for those IGEL Endpoints that are provisioned from a Microsoft Hyper-V Hypervisor.