GPA Manual for G-series RVUs

Guardian Performance Analyzer (GPA) Manual – (544977-001) Page 23 of 106
Running Measure
In this step, you run Measure to collect performance data for the system. When you run
Measure, you specify the measurement window and data collection interval that you
established in the previous step. (Refer to the Measure User’s Guide for more
information on using this product.)
Determining the Analysis Period
The object of this step is to examine the data collected with Measure in the preceding
step to determine the most appropriate period of system use for GPA to analyze. Keep
in mind the following:
• The analysis period should include the time of heaviest use, but should not be so
narrow as to result in tuning the system for just a sharp peak. For a system in
consistent daily use for 24 hours or some other large part of the day, the busiest
threehour period is the most suitable for analysis.
• The analysis period should be a minimum of one hour.
Creating the Structured Data Files for GPA
The purpose of this step is to create the three structured data files (CPU, PROCESS,
and DISC) that GPA will use for its analysis. You do this by using the Measure file
handler MEASFH.
Note
If MEASCOM reports a mismatch, it probably occurred because the system on which
you are running GPA is not the one being analyzed. This problem can be solved by
copying the active MEASFH file on the system being analyzed to the Measure data
subvolume. You can then move the correct MEASFH along with the Measure data files
to the other system.
Editing the GPA Text Statements
This is an optional step and is required only if you want to change the GPA text
statements (see GPA Analysis Statements
in Section 3: Description of GPA
Reports or omit them from the GPA report entirely. Editing the text statements,
contained in a file named TUNEDATA, requires some care and in doing so, you should
bear in mind the following:
• To edit the statements, use one of the NonStop system editors: EDIT, TEDIT, or
SEEDIT.
• GPA inserts performance data and variable information in the text statements by
means of a keyword-and-code-character analysis. Therefore, to maintain the
integrity of this information, do not change any of the code characters. These
characters precede each statement paragraph and are sometimes also embedded in