Q-Logic IB6054601-00 D Bedienungsanleitung PDF herunterladen (Seite 64)

3 – Using InfiniPath MPI

InfiniPath MPI Limitations

3-22 IB6054601-00 D

No ports available on /dev/ipath

NOTE: If port sharing is enabled, this limit is raised to 16 and 8 respectively. To

enable port sharing, set PSM_SHAREDPORTS=1 in your environment

There are no C++ bindings to MPI -- use the extern C MPI function calls.

In MPI-IO file I/O calls in the Fortran binding, offset or displacement arguments are

limited to 32 bits. Thus, for example, the second argument of

MPI_File_seek must

lie between -2

and 2

-1, and the argument to MPI_File_read_at must lie

between 0 and 2

-1.

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InfiniPath User Guide 1
Page ii IB6054601-00 D 2
IB6054601-00 D Page iii 3
Table of Contents 5
Page vi IB6054601-00 D 6
Appendix A Benchmark Programs 7
Appendix C Troubleshooting 7
Page viii IB6054601-00 D 8
IB6054601-00 D Page ix 9
Version 2.0 10
Page x IB6054601-00 D 10
Introduction 11
Overview 12
Switches 12
Interoperability 12
What’s New in this Release 13
Software Components 15
■ The InfiniPath User Guide 16
■ Release Notes 16
■ Quick Start Guide 16
1 – Introduction 18
1-8 IB6054601-00 D 18
Installed Layout 19
Memory Footprint 20
■ 1 adapter per node 21
InfiniPath Driver Startup 23
InfiniPath Driver Filesystem 23
Subnet Management Agent 24
Layered Ethernet Driver 24
Software Status 33
Process Limitation with ssh 35
Remove Unneeded Services 35
Disable Powersaving Features 36
Balanced Processor Power 37
CPU Affinity 37
Hyper-Threading 38
Homogeneous Nodes 38
Customer Acceptance Utility 40
2-24 IB6054601-00 D 42
Using InfiniPath MPI 43
An Example C Program 44
InfiniPath MPI Details 47
Compiling and Linking 49
To Use Another Compiler 50
Compiler and Linker Variables 51
Cross-compilation Issues 51
Running MPI Programs 52
The mpihosts File 53
Console I/O in MPI Programs 54
Environment for Node Programs 54
Multiprocessor Nodes 56
MPI Over uDAPL 59
MPD Description 60
Using MPD 60
File I/O in MPI 60
MPI-IO with ROMIO 61
Debugging MPI Programs 62
MPI Errors 62
Using Debuggers 62
InfiniPath MPI Limitations 63
Benchmark Programs 65
A – Benchmark Programs 70
A-6 IB6054601-00 D 70
A Batch Queuing Script 71
Allocating Resources 71
Generating the mpihosts File 72
Simple Process Management 73
Troubleshooting 75
BIOS Settings 76
Incorrect MTRR Mapping 77
Software Installation Issues 79
OpenFabrics Dependencies 79
Install Warning with RHEL4U2 79
Kernel Needs CONFIG_PCI_MSI=y 82
OpenFabrics Issues 86
Broken Intermediate Link 87
Performance Issues 87
MVAPICH Performance Issues 87
Mixed Releases of MPI RPMs 87
Compiler/Linker Mismatch 89
Using MPI.mod Files 93
Extending MPI Modules 94
C.8.12.1 96
MPI Messages 98
C.8.12.3 101
MPI Stats 102
Restarting InfiniPath 103
Recommended Reading 113
Clusters 114
Glossary 115
E – Glossary 116
E-2 IB6054601-00 D 116
IB6054601-00 D E-3 117
E-4 IB6054601-00 D 118
IB6054601-00 D E-5 119
E-6 IB6054601-00 D 120

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