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

Digital Support
Digital Support

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

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


QlikView 12.20 (November 2017) 



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



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

  • Stop the QlikView Distribution Service
  • Navigate to C:\Program Files\QlikView\Distribution Service\DistributionService.exe.config
  • 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. 
To get the total of your tasks you can use the QVPR Analyser: https://community.qlik.com/docs/DOC-5892 Note that this tool is not a supported tool by Qlik.
  • Save the file
  • Start the QlikView Distribution Service
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Last update:
‎2020-08-26 06:56 AM
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