HP-UX Workload Manager User's Guide

Configuring WLM
Tuning the metrics and the SLOs
Chapter 5224
Trimming the statistics log file automatically
(optional)
You can automatically trim the statistics log file /var/opt/wlm/wlmdstats.
This file is created when you use the -l option to wlmd. Enable automatic
trimming of the file by using the wlmdstats_size_limit tunable. The
syntax is:
wlmdstats_size_limit = number_of_megabytes;
where
wlmdstats_size_limit
Is an optional tunable. Specify this tunable in a global
tune structure.
number_of_megabytes
Is an integer value from 0 to 2048. Once a file’s size is
greater than number_of_megabytes, the file is
trimmed. The default value is 0, which disables
automatic trimming. The wlmdstats file is trimmed by
renaming it wlmdstats.old. Then a new wlmdstats file
is started. The wlmdstats.old file includes a line at the
end of the file indicating that the file has been
automatically trimmed.
Tuning a workload’s SLO convergence:
cntl_kp (optional)
NOTE You can also tune convergence with the cntl_convergence_rate
tunable discussed in the section “Tuning a workload’s SLO convergence:
cntl_convergence_rate (optional)” on page 229.
The cntl_convergence_rate tunable, which uses normalization to
arrive at a new CPU allocation, is typically easier to use—requiring less
analysis than cntl_kp.