How Memory Usage is Calculated

On HP-UX:

Supplied templates are stored in /var/opt/amgr/templates/amgr/ to make it easier to update templates with new releases of HP Application Discovery. New application templates provided by HP can replace templates in this directory. Copies of these templates, which are stored in /var/opt/amgr/templates/local/, are unaffected by release updates to the software.

On Microsoft® Windows:

Templates are stored in the VSE install directory (C:\Program Files\HP\Virtual Server Environment\data\templates\). For information on where HP VSE is installed by default, see HP Insight Control Management Quick Setup Poster.

Processes have private memory, which is owned privately by each process, and they have shared memory. Shared memory can be shared (in theory) with none, one, some, or all other processes on the same system.

In Application Discovery memory calculations are made for matched applications and displayed in the detail screen of a host (total memory usage and by application), as shown in the following image.

In Application Discovery, application memory shown is the sum of all private memory in use by all the processes in that application and the sum of all shared memory in use by all the processes in that application. That is, shared memory is displayed as though it is not shared. This means that the totals shown for memory usage are an overstated approximation of actual memory usage for any particular application.

Here is why accurately summing memory shared among processes is difficult to do:

•The degree of sharing among processes is unknown. For a given process, the shared memory can be shared with every process on the system, only some processes on the system, only some processes within the application, or with all of the processes within the application.

•The 'right' answer for how to sum shared memory for processes depends in part on how the individual administrator uses the information for planning. For example, is the administrator thinking of adding an application instance to the host? Is he or she thinking of moving an application instance to another host? Is the administrator thinking of moving the entire application to another host?

To arrive at a usable deterministic answer, all the shared memory for each process is summed. This conservative calculation should allow you to safely estimate resource usage for the applications shown.

Understanding Server Resource Consumption

Application Discovery consumes varying amounts of server resources as it goes about its work of discovering application and system data for display and storage. To monitor this resource usage, select the Admin/Config tab and then the AD Server tab.

How Memory Usage is Calculated 19

5992-3838 specifications

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