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Guardian Performance Analyzer (GPA) User Guide – (544541-006) Page 114 of 131
Implementing GPA Tuning
Recommendations
On the basis of its analysis, GPA makes the following kinds of explicit tuning
recommendations:
Moving primary disk processes to correct a load imbalance on the node.
Resetting disk cache allocations to improve cache hit performance and/or reduce
disk queuing.
Moving processes among CPUs to relieve a detected memory shortage problem or
to correct a processor utilization imbalance.
Reconfiguring the number of disk subprocesses associated with a logical volume.
Note that in making each tuning recommendation for a given run, GPA takes into account
the effect on the system of all previous tuning recommendations for that run. In this
way, GPA is able to issue multiple tuning recommendations in a single analysis.
You can implement the GPA recommendations for moving primary disk processes and
resetting cache allocations simply by running PUP or SCF using the PUPIN or SCFIN
file as input. Note that you must be a super group user to do this. PUPIN contains the
PUP PRIMARY and PUP SETCACHE commands required to perform the
corresponding tuning operations. SCFIN contains the SCF PRIMARY and SCF ALTER
DISK, CACHE commands required to perform the corresponding tuning operations.
If, after running PUPIN/SCFIN, you want to restore the system to its previous state, you
can do so by running PUP or SCF using PUPBAK or SCFBAK as the input file. After
implementing the GPA tuning recommendations, you should remeasure the system
and run another GPA analysis.
Beyond the GPA tuning recommendations, you can take these steps to deal with system
performance problems:
Check applications for possible bottlenecks.
Examine the data communications environment for sources of trouble.
Analyze the system hardware to determine if it provides an optimum configuration.
For system tuning, you need to keep in mind that GPA is meant to serve mainly as a guide
and to provide a quick and convenient performance analysis. For the best long-term
solutions to system performance problems, you need to have properly trained
personnel do a careful and detailed analysis.
[Back to TOC]
- (GPA) User Guide 1
- Document History 2
- Table of Contents 3
- List of Figures and Tables 7
- What’s New in This Manual 10
- About This Manual 11
- Notation Conventions 12
- …" 13
- Notation for Messages 16
- Section 1: Introducing GPA 19
- GPA Benefits and Features 20
- How GPA Works 21
- GPAH GPAG 22
- OBEYTUNE 22
- Standard Report Sections 24
- Optional Report Sections 25
- Exclude File 27
- File Specifications 28
- GPA Requirements 29
- Section 2: Running GPA 30
- Running Measure 32
- Running GPA 33
- Caution 34
- The GPA Pre-Requisites 35
- Example 36
- The GPA Runtime Parameters 38
- The GPA Procedure 40
- GPA Error Messages 42
- GPA Standard Report 45
- Node Characteristics 46
- Disk Volume Performance 48
- System Performance Score 51
- Processor Load Balance Chart 54
- Processor Performance Chart 56
- 60
- IPC Traffic Analysis 65
- GPA Analysis Statements 69
- GPA Optional Report 70
- Summary Section 72
- Detail Section 74
- System Performance Summary 76
- Cache Performance Analysis 92
- After Primary Changes 97
- Primary Changes 100
- Changes 101
- [Back to TOC] 101
- Process Move Recommendations 102
- Report Considerations 102
- Class for \NODEC 113
- Implementing GPA Tuning 114
- Recommendations 114
- Reports 115
- CPU Failure Simulation 121
- Disk Cache Change Analysis 125
- CPU Cache Change Analysis 126
- Error Reports 127
- Glossary 128
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