Qlogic OFED+ Host Spécifications Page 121
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Noté. / 5. Basé sur avis des utilisateurs
B–Benchmark Programs
Benchmark 4: Measuring MPI Latency in Host Rings
IB6054601-00 H B-5
A
Searching for N/2 bandwidth. Maximum Bandwidth of 1958.400649
MB/s...
Found N/2 bandwidth of 992.943275 MB/s at size 153 bytes
This microbenchmark is available and can be downloaded from the QLogic web site:
http://www.qlogic.com
Benchmark 4: Measuring MPI Latency in Host
Rings
The program mpi_latency measures latency in a ring of hosts. Its syntax is
different from Benchmark 1 in that it takes command line arguments that let you
specify the message size and the number of messages over which to average the
results. For example, with a hosts file listing four or more nodes, the command:
$ mpirun -np 4 -ppn 1 -m mpihosts mpi_latency 100 0
might produce output like this:
0 1.760125
This output indicates that it took an average of 1.76 microseconds per hop to send
a zero-length message from the first host, to the second, to the third, to the fourth,
and then receive replies back in the other direction.
- OFED Software Users Guide 1
- Document Revision History 2
- QLogic OFED Version 1.4 13
- IB6054601-00 H Page xiii 13
- Page xiv IB6054601-00 H 14
- Table of Contents 15
- 5 Using QLogic MPI 16
- 6 Using Other MPIs 17
- List of Figures 22
- List of Tables 22
- 1 Introduction 23
- Overview 24
- Interoperability 25
- Convention Meaning 26
- Documentation 27
- Contact Information 27
- 1–Introduction 28
- 1-6 IB6054601-00 H 28
- 2 Feature Overview 29
- Other Changes 30
- Continued Support 30
- Table Notes 31
- PCIe is Gen 1 31
- Compiler Support 33
- Software Components 33
- 2–Feature Overview 34
- 2-6 IB6054601-00 H 34
- 3 Step-by-Step Cluster Setup 35
- Using MPI 36
- 4 InfiniPath Cluster Setup 37
- Installed Layout 38
- Memory Footprint 39
- 4-6 IB6054601-00 H 42
- # ifconfig ib0 42
- Using QLogic SRP 45
- Using OFED SRP 45
- IB6054601-00 H 4-11 47
- # ib_qlgc_vnic_query 47
- 4-12 IB6054601-00 H 48
- IB6054601-00 H 4-13 49
- 4-18 IB6054601-00 H 54
- $ ibv_devinfo 54
- InfiniPath Driver Filesystem 57
- Homogeneous Nodes 58
- Adapter and Other Settings 58
- Remove Unneeded Services 59
- Disable Powersaving Features 60
- Hyper-Threading 60
- Configuring for ssh 61
- The Intel Cluster Checker 67
- 4-32 IB6054601-00 H 68
- Other MPIs 70
- MPI-IO with ROMIO 70
- Getting Started with MPI 71
- QLogic MPI Details 73
- To Use Another Compiler 76
- Process Allocation 78
- 5–Using QLogic MPI 79
- IB6054601-00 H 5-11 79
- 5-12 IB6054601-00 H 80
- PSM_SHAREDCONTEXTS=0 80
- PSM_SHAREDCONTEXTS=NO 80
- Running in Shared Memory Mode 81
- Using mpirun 83
- Console I/O in MPI Programs 85
- Environment for Node Programs 85
- Environment Variables 86
- Name Description 87
- Performance Tuning 89
- MPD Description 91
- Using MPD 91
- Applications 92
- Debugging MPI Programs 93
- QLogic MPI Limitations 94
- Open MPI 97
- Running Open MPI Applications 98
- Running MVAPICH Applications 100
- Installation 102
- Compiling HP-MPI Applications 102
- Running HP-MPI Applications 102
- More Information on HP-MPI 102
- Platform (Scali) MPI 103
- Intel MPI 104
- IB6054601-00 H 6-13 107
- 6–Using Other MPIs 107
- 6-14 IB6054601-00 H 108
- A mpirun Options Summary 109
- Spawn Options 110
- Quiescence Options 111
- Verbosity Options 111
- Startup Options 111
- Stats Options 112
- Tuning Options 113
- Shell Options 114
- Debug Options 114
- Format Options 115
- Other Options 115
- A–mpirun Options Summary 116
- A-8 IB6054601-00 H 116
- B Benchmark Programs 117
- Between Two Nodes 119
- B–Benchmark Programs 122
- B-6 IB6054601-00 H 122
- C Integration with a Batch 123
- Using SLURM for Batch Queuing 124
- Allocating Resources 125
- Generating the mpihosts File 125
- Simple Process Management 126
- D Troubleshooting 129
- BIOS Settings 130
- SDP Module Not Loading 136
- Performance Issues 137
- Affinity on Opteron Systems 138
- MVAPICH Performance Issues 138
- Erratic Performance 139
- QLogic MPI Troubleshooting 140
- Mixed Releases of MPI RPMs 141
- Missing mpirun Executable 141
- Cross-Compilation Issues 142
- Compiler/Linker Mismatch 143
- Process Limitation with ssh 148
- Using MPI.mod Files 149
- Extending MPI Modules 149
- Queuing System 151
- General Error Messages 154
- MPI Messages 156
- MPI Stats 159
- D–Troubleshooting 160
- D-32 IB6054601-00 H 160
- E Write Combining 161
- PAT and Write Combining 162
- E–Write Combining 164
- E-4 IB6054601-00 H 164
- F Useful Programs and Files 165
- Table F-1. Useful Programs 166
- Program Name Function 166
- F–Useful Programs and Files 175
- IB6054601-00 H F-11 175
- # modprobe -v ib_ipath 175
- Common Tasks and Commands 177
- Function Command 178
- subdirectory of the 183
- F-20 IB6054601-00 H 184
- G Recommended Reading 185
- Clusters 186
- Networking 186
- Other Software Packages 186
- Glossary 187
- EE – kDAPL 188
- Glossary-2 IB6054601-00 H 188
- IB6054601-00 H Glossary-3 189
- Glossary-4 IB6054601-00 H 190
- IB6054601-00 H Glossary-5 191
- RDMA — uDAPL 191
- Glossary-6 IB6054601-00 H 192
- Numerics 193
- Index-2 IB6054601-00 H 194
- IB6054601-00 H Index-3 195
- Index-4 IB6054601-00 H 196
- IB6054601-00 H Index-5 197
- Index-6 IB6054601-00 H 198
- IB6054601-00 H Index-7 199
- Index-8 IB6054601-00 H 200
- IB6054601-00 H Index-9 201
- Index-10 IB6054601-00 H 202
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