Hi,
We are experiencing a peculiar issue with increased CPU utilisation at present and would appreciate any suggestions / guidance on how to resolve it.
The issue is we are seeing the winlogon.exe process continuing to utilise 1 - 3% CPU after login has completed, for each Citrix login via LoadRunner - for users manually logged-in this doesn't happen. The oddity is that the Citrix servers run on a mixture of ESX v4 and ESX v5.1 hosts - same Citrix image on both, however only the servers on ESX v5.1 exhibit the issue.
We have been discussing with Citrix the cause and below is a summary from that (although it's not certain this is root cause):
Traces have identified the client is requesting the TWI service by using the outputMode Flag a certain amount of CPU will have to be consumed to do the window monitoring even with AA hook enabled. Loadrunner seems to use the ICO .net API. So somewhere in the script used I suspect that there is a line of code:
$ICA.OutputMode = [WFICALib.OutputMode]::OutputModeNormal
# Valid OutputModes: OutputModeNonHeadless, OutputModeNormal, OutputModeRenderless,
If any of the above are set this means that outputMode=1.
Is there any way we can configure Loadrunner to set OutputMode to 0 or remove the flag completely.
We're running:
Citrix Server v6.1
ICA Client: v13.4.200