Table of Contents

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  1. Preface
  2. Analyst Service
  3. Content Management Service
  4. Data Integration Service
  5. Data Integration Service Architecture
  6. Data Integration Service Management
  7. Data Integration Service Grid
  8. Data Integration Service Applications
  9. Metadata Manager Service
  10. Model Repository Service
  11. PowerCenter Integration Service
  12. PowerCenter Integration Service Architecture
  13. High Availability for the PowerCenter Integration Service
  14. PowerCenter Repository Service
  15. PowerCenter Repository Management
  16. PowerExchange Listener Service
  17. PowerExchange Logger Service
  18. SAP BW Service
  19. Search Service
  20. System Services
  21. Test Data Manager Service
  22. Web Services Hub
  23. Application Service Upgrade
  24. Application Service Databases
  25. Connecting to Databases from Windows
  26. Connecting to Databases from UNIX
  27. Updating the DynamicSections Parameter of a DB2 Database
  28. Reporting Service (Deprecated)
  29. Reporting and Dashboards Service (Deprecated)

Dispatch Mode

Dispatch Mode

The dispatch mode determines how the Load Balancer selects nodes to distribute workflow tasks. The Load Balancer uses the following dispatch modes:
  • Round-robin. The Load Balancer dispatches tasks to available nodes in a round-robin fashion. It checks the Maximum Processes threshold on each available node and excludes a node if dispatching a task causes the threshold to be exceeded. This mode is the least compute-intensive and is useful when the load on the grid is even and the tasks to dispatch have similar computing requirements.
  • Metric-based. The Load Balancer evaluates nodes in a round-robin fashion. It checks all resource provision thresholds on each available node and excludes a node if dispatching a task causes the thresholds to be exceeded. The Load Balancer continues to evaluate nodes until it finds a node that can accept the task. This mode prevents overloading nodes when tasks have uneven computing requirements.
  • Adaptive. The Load Balancer ranks nodes according to current CPU availability. It checks all resource provision thresholds on each available node and excludes a node if dispatching a task causes the thresholds to be exceeded. This mode prevents overloading nodes and ensures the best performance on a grid that is not heavily loaded.
When the Load Balancer runs in metric-based or adaptive mode, it uses task statistics to determine whether a task can run on a node. The Load Balancer averages statistics from the last three runs of the task to estimate the computing resources required to run the task. If no statistics exist in the repository, the Load Balancer uses default values.
In adaptive dispatch mode, the Load Balancer can use the CPU profile for the node to identify the node with the most computing resources.
You configure the dispatch mode in the domain properties.