HP-UX Workload Manager A.02.03.01 Release Notes for HP-UX 11i V1.0 and HP-UX 11i V2.0

HP-UX Workload Manager Release Notes

Known problems and workarounds

Capping issue on Pay Per Use and iCOD systems

Issue WLM maintains CPU allocations for workloads by capping their CPU

access. Unfortunately, an algorithm in the CPU scheduler that WLM uses

does not always preserve capping when one or more CPUs are deactivated

on a Pay Per Use system or an iCOD system.

Workaround Configure WLM as desired and then determine whether the capping issue is

present on your system. To determine whether this issue is present:

1. Activate your WLM configuration:

# wlmd -a configuration_file

2. Wait for several WLM intervals (60 seconds by default) to pass.

3. Display CPU shares and utilization data by entering the wlminfo

command:

# wlminfo group

A portion of sample wlminfo output is shown below:

Workload Group PRMID CPU Shares CPU Util Mem Shares State

OTHERS 1 450.00 4.49 0.00 ON

g_nice 2 108.00 55.57 0.00 ON

g_nightly 3 0.00 0.00 0.00 OFF

g_team 4 6.00 0.00 0.00 ON

4. Check the “CPU Shares” and “CPU Util” columns. For a given group, if

its “CPU Util” value is ever significantly greater than its “CPU Shares”

value, your system is affected by this issue. (“CPU Util” values slightly

above “CPU Shares” are normal.)

5. If your system is affected, install the following patches:

On HP-UX 11i V1.0 (B.11.11), install patches PHKL_30032,

PHKL_30033, PHKL_30034, PHKL_30035, PHKL_30036, and

PHKL_30037. Install all these patches at the same time.

On HP-UX 11i V2.0 (B.11.23), install the BUNDLE11i patch bundle.

Any version of this bundle is acceptable.