User Input Delay - OS Test

One of the most difficult problems to diagnose by the administrators on physical desktops is the poor performance of the applications installed. Traditionally, diagnosis was done by collecting CPU, memory, disk I/O and a few other metrics. The data collected from traditional metrics were not sufficient to figure out the root cause of poor performance of the applications on the physical desktop since the variations measured by the metrics were large. Let's say, the user input (e.g. keyboard clicks and mouse clicks) sits in the input queue on the physical desktop host for longer duration until the input is picked up for processing by an application’s message queue. In such a case, the User Input Delay starts increasing because the physical desktop is under load, it means the slowness has been introduced on the physical desktop (and is not due to the network). This could be a sign that user experience is degrading to the point where administrators might want to add more hosts or increase the instance size of your hosts. Therefore, it is necessary for administrators to measure the user input flows or rather user input delays while the applications are being accessed. This can be easily measured using the User Input Delay - OS test!

This test captures such user input delays at each physical desktop and reports the same to the administrators. With the help of this test, administrators can determine the maximum and average time taken by the applications to respond to the user input at the physical desktop, and thus figure out if there is any time delay in responses from applications. In addition, these metrics help administrators to differentiate desktop-side issues from network issues.


This test will report measures only on physical desktops running Windows 2010 or above.

Target of the test : A Physical Desktop Group

Agent deploying the test : A remote agent

Outputs of the test : One set of results for the Physical Desktop Group that is being monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.


The nick name of the Physical Desktop Group component for which this test is to be configured.


Refers to the port at which the specified host listens to. By default, this is NULL.

Inside View Using

To obtain the 'inside view' of performance of the desktops - i.e., to measure the internal performance of the physical desktops - this test uses a light-weight eG VM Agent software deployed on each of the desktops. Accordingly, this parameter is by default set to eG VM Agent.

Report Powered OS

This flag is relevant only for those tests that are mapped to the Physical Desktops Details layer. If this flag is set to Yes (which is the default setting), then the 'inside view' tests will report measures for even those physical desktops that do not have any users logged in currently. Such desktops will be identified by their name and not by the username_on_physicalmachinename. On the other hand, if this flag is set to No, then this test will not report measures for those physical desktops to which no users are logged in currently.

Report By User

This flag is set to Yes by default. This implies that the physical machines in environments will always be identified using the login name of the user. In other words, this test will, by default, report measures for every username_on_physicalmachinename.

DD Frequency

Refers to the frequency with which detailed diagnosis measures are to be generated for this test. The default is 2:1. This indicates that, by default, detailed measures will be generated every time this test runs, and also every time the test detects a problem. You can modify this frequency, if you so desire. Also, if you intend to disable the detailed diagnosis capability for this test, you can do so by specifying none against DD frequency.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Maximum input delay

Indicates the maximum amount of time lag detected between the user's input through any input device (e.g., mouse, keyboard) and the time at which the application responds to the input.


Ideally, the values of these measures should be 0 or very low.

To know exactly which user/application experiences the maximum input lag, you can refer to the detailed diagnosis revealed by these measures.

Average input delay

Indicates the average amount of time lag detected between the user's input through any input device (e.g., mouse, keyboard) and the time at which the application detected the input.