QlikView Distribution Service / Publisher (QDS) high CPU usage without active tasks

[Sonja_Bauernfeind]

The QlikView Distribution Service (QDS) is consuming a high percentage of overall CPU capacity.  No tasks are actively running. 

High Memory Handles in task manager for Qlikview Distribution Service are observed.

Environment:

QlikView  

All tasks will be checked no matter if they are enabled or disabled every 500ms in general, the auto adjustment option is not working good when a large number of tasks are disabled or not properly setup.

Risks for high cpu usage are caused by:

• large number of disabled tasks,
• enabled tasks but no source document connected to it.
• a fresh QVPR restore, but unfinished setup

Resolution:

Task files need to be updated regularly. It is possible to adjust the number of tasks updated per thread.

1. Stop the QlikView Distribution Service
2. Navigate to C:\Program Files\QlikView\Distribution Service\DistributionService.exe.config
3. Open the file in a text editor with elevated permissions.
   
   Option 1: Locate the below setting, or add it:
   

   <!-- Time to pause between task result cache updates, in milliseconds. -->
   <add key="TaskResultCacheUpdateSleepTimeBetweenUpdates" value="200"/>​

   
   Change the value to 1000, which is 1 sec, do not use a higher value than that.
   
   Option 2 (if the first one does not show results):
   

   <!-- Max number of tasks per thread updating the task result cache. Value less than one (1) enabled automatic calibration. -->
   <add key="TaskResultCacheUpdateMaxTasksPerThread" value="0"/>​

   
   Raise the value to lower the baseline QDS CPU consumption.  A starting value can be a slightly higher number than the total number of tasks in the deployment.
   
   
4. Save the file
5. Start the QlikView Distribution Service

[qwebnm]

What happens if I lower the value of TaskResultCacheUpdateSleepTimeBetweenUpdates from 200?