HP Process Resource Manager User's Guide

Fine-tuning your PRM configuration
Using prmanalyze to analyze your configuration
Chapter 8 167
almost all the machine! Upon closer examination though, the
administrator finds that the total seconds used is about the same as
every other day, but all the other groups went virtually idle on the
weekend. This application might be able to do its job even faster if we
took off the memory cap for group 2 only on the weekends. Because there
is no contention, a second configuration file could be created to repeal all
memory records and change the CPU allocations for the weekend.
Another item to note in the report is that group 1 (OTHERS) has bursts of
high activity relative to its normal levels. It may be worthwhile to do a
CPU conflict report, excluding known applications, to see who the
offender is:
# prmanalyze -s command -r cpu -t conflict -1 -d .4 -x mrkt_rsch -x financials
conflict CPU report by command name begins at Thu Jul 8 10:11:00 1999
ave CPUs threshold 0.40
unique id ave CPUs peak CPUs total secs % total
Jul 8 8:35 -
Jul 8 9:17 0.58 0.80 6102.48
mail_reader 0.50 0.56 5331.36 87.36
java 0.06 0.20 578.52 9.48
vi 0.02 0.09 155.52 2.55
It seems that in the morning, and then again after lunch, everyone in
OTHERS is busy reading mail. The administrator can track this usage. If it
gets out of hand, the administrator can then isolate mail_reader to its
own PRM group.
Example: Disk bandwidth
In the final example, mrkt_rsch users complain their report is taking too
long to generate. Using methods already outlined, the administrator
re-examines disk policy. The summary reports show that dump backup
takes over 90% of the disk bandwidth for the day. What happens if we
look for conflicts in disk usage without the interference of dump? We set
the conflict threshold at four Mbytes/second because our primary disk
volume group can service somewhere between four and eight Mbytes per
second, depending on the type of I/O. We exclude the financials
application because it runs in the Finance group, and has a disk of its
own.