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IB6054601-00 H B-1
B Benchmark Programs
Several MPI performance measurement programs are installed from the
mpi-benchmark RPM. This appendix describes these benchmarks and how to
run them. These programs are based on code from the group of Dr. Dhabaleswar
K. Panda at the Network-Based Computing Laboratory at the Ohio State
University. For more information, see: http://mvapich.cse.ohio-state.edu/
These programs allow you to measure the MPI latency and bandwidth between
two or more nodes in your cluster. Both the executables, and the source for those
executables, are shipped. The executables are shipped in the mpi-benchmark
RPM, and installed under /usr/bin. The source is shipped in the mpi-devel
RPM and installed under /usr/share/mpich/examples/performance.
The following examples are intended to show only the syntax for invoking these
programs and the meaning of the output. They are not representations of actual
InfiniPath performance characteristics.
Benchmark 1: Measuring MPI Latency Between
Two Nodes
In the MPI community, latency for a message of given size is the time difference
between a node program’s calling MPI_Send and the time that the corresponding
MPI_Recv in the receiving node program returns. The term latency, alone without
a qualifying message size, indicates the latency for a message of size zero. This
latency represents the minimum overhead for sending messages, due to both
software overhead and delays in the electronics of the fabric. To simplify the
timing measurement, latencies are usually measured with a ping-pong method,
timing a round-trip and dividing by two.
The program osu_latency, from Ohio State University, measures the latency for
a range of messages sizes from 0 to 4 megabytes. It uses a ping-pong method, in
which the rank zero process initiates a series of sends and the rank one process
echoes them back, using the blocking MPI send and receive calls for all
operations. Half the time interval observed by the rank zero process for each
exchange is a measure of the latency for messages of that size, as previously
- 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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