Hp XC System 3.x Software Manual de usuario descargar pdf (Pagina 48)

Interpreting hpcpilist Event Counts

The value of the instruction pointer recorded is typically several or many instructions after the

instruction that caused the event. This lag or skid is common to all profilers that sample instruction

pointers and HPCPI does not attempt to model the system to correct for this. As a result, HP

recommends that you examine the assembly code surrounding regions where high event counts

occur and consider if the surrounding code might be triggering the events. For more information,

see “HPCPI Product Limitations” (page 115).

48 Using HPCPI

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HP Part Number: 5992-4009 1
Published: March 2008 1
Edition: 1 1
Table of Contents 3
4 Table of Contents 4
Table of Contents 5 5
6 Table of Contents 6
Table of Contents 7 7
8 Table of Contents 8
List of Figures 9
List of Tables 11
About This Document 13
Related Information 14
Publishing History 14
HP Encourages Your Comments 15
1 Introduction 17
18 Introduction 18
22 Introduction 22
2 Installing HPCPI and Xtools 25
Installing the Software 26
Installing the Software 27 27
Installing the Software 29 29
Verifying the Installation 30
Removing the Software 30
3 Getting Started with HPCPI 31
32 Getting Started with HPCPI 32
4 Using HPCPI 35
Starting the hpcpid Daemon 36
Selecting Events to Monitor 37
Commonly Used Event Sets 38
Event Duty Qualifier 39
Labeling Data 40
42 Using HPCPI 42
Default Input Data 43
Flushing Data: hpcpictl flush 43
HPCPI Header 44
HPCPI Procedure Header 46
48 Using HPCPI 48
50 Using HPCPI 50
HPCPI Utility Options 51
Specifying Events to Display 52
Selecting Data by Label 52
Displaying Raw Values 53
Limiting the hpcpiprof Output 54
Additional Options 54
Using Event Sets 55
Event Intervals 56
Multiple Duty Groups 56
Itanium Instruction Metrics 57
5 Using HPCPI Labels 59
Step 3: Flushing the Data 60
Label Selectors 62
-not Operator 63
-and Operator 63
-or Operator 63
-equiv Operator 63
Operator Syntax 63
Multiple Labels 64
Reusing Labels 64
Comparing Epochs and Labels 64
Label Examples 65
Kernel Idle Data: -pid 0 66
Creating Labels in Programs 67
Fortran Code Example 68
Overview 69
% setenv HPCPIDB ~/hpcpidb 70
% mkdir -p $HPCPIDB 70
% hpcpid -create-epoch 70
Submitting the Job 71
Collecting Data on One Node 73
7 Using Xtools 75
Xtools Overview 76
Using xclus and xcxclus 76
Using xclus and xcxclus 77 77
Starting xclus and xcxclus 78
Starting xclus and xcxclus 79 79
80 Using Xtools 80
82 Using Xtools 82
84 Using Xtools 84
86 Using Xtools 86
Recording Data 89
Replaying Data 89
Plotting Data 89
90 Using Xtools 90
Viewing Grouped Nodes 92
Using xperf and xcxperf 94
Starting xperf and xcxperf 94
Instructions 96
Sum I/O B/W 97
98 Using Xtools 98
HTn (HyperTransport Links) 100
102 Using Xtools 102
106 Using Xtools 106
108 Using Xtools 108
% xclus -generic 109
% xcxclus -enhanced -apmond 110
Xtools Daemons 111
A Product Specifications 113
114 Product Specifications 114
HPCPI Product Limitations 115
Calls to exec() 116
Unknown Locations 116
Mandated Duty Groups 116
Active Fraction Changes 116
B HPCPI Quick Reference 117
Viewing HPCPI Data 118
C Xtools Quick Reference 119
Starting xperf or xcxperf 121
Glossary 123
124 Glossary 124
126 Index 126
128 Index 128
130 Index 130

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Hp XC System 3.x Software Manual de usuario Pagina 48

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