Set the minimum CPU utilization for a service class by
setting the value of the wlm_disp_min_util database
manager configuration parameter to a percentage. Service classes utilizing
CPU resources equal to or greater than that percentage are considered
active on the host or logical partition (LPAR) and the CPU shares
of the active service classes are factored into CPU allocation calculations.
Procedure
To set the minimum CPU utilization percentage for
service classes to be considered active:
Using the command line processor (CLP), issue the UPDATE
DATABASE MANAGER CONFIGURATION (or UPDATE DBM CFG)
command and set the value of the wlm_disp_min_util database
manager configuration parameter to 6%; the
parameter value is updated immediately by first attaching to your DB2® instance: attach to instance-name
update dbm cfg using wlm_disp_min_util 6
detach
Results
The minimum CPU utilization percentage for service classes
to be considered active has been set. Service classes that have a
CPU utilization percentage that is less than this minimum are considered
to be idle and their CPU allocations can then be proportionally reallocated
to service classes that can claim spare CPU resources.
What to do next
After having set the minimum CPU utilization percentage
for service classes to be considered active by the workload management
dispatcher, consider completing the following tasks:
- For the minimum CPU utilization setting to be effective, you must
enable the workload management dispatcher by configuring the wlm_dispatcher database
manager configuration parameter. See: Enabling workload management dispatcher.
- Set the dispatch concurrency level by configuring the wlm_disp_concur database
manager configuration parameter. See: Setting dispatch concurrency level.
- Create or alter a service class and configure the CPU limit by
using the CREATE SERVICE CLASS or ALTER SERVICE CLASS statement. See: Setting a CPU limit.
- Enable hard and soft CPU shares by configuring the wlm_disp_cpu_shares database
manager configuration parameter. See step 1 in: Enabling and setting CPU shares.
- Create or alter a service class and configure a hard or soft CPU
share by using the CREATE SERVICE CLASS or ALTER SERVICE CLASS statement.
See: Enabling and setting CPU shares.