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A–Benchmark Programs
Benchmark 2: Measuring MPI Bandwidth Between Two Nodes
A-4 IB0054606-02 A
Benchmark 2: Measuring MPI Bandwidth
Between Two Nodes
The osu_bw benchmark measures the maximum rate that you can pump data
between two nodes. This benchmark also uses a ping-pong mechanism, similar to
the osu_latency code, except in this case, the originator of the messages
pumps a number of them (64 in the installed version) in succession using the
non-blocking MPI_I send function, while the receiving node consumes them as
quickly as it can using the non-blocking MPI_Irecv function, and then returns a
zero-length acknowledgement when all of the sent data has been received.
You can run this program by typing:
$ mpirun -H host1,host2 \
/usr/mpi/gcc/openmpi-1.4.3-qlc/tests/osu_benchmarks-3.1.1/osu
_bw
- OFED+ Host Software 1
- Release 1.5.4 1
- Document Revision History 2
- Table of Contents 3
- IB0054606-02 A v 5
- 5 Using Other MPIs 6
- E ULP Troubleshooting 10
- F Write Combining 10
- G Commands and Files 10
- H Recommended Reading 11
- List of Figures 12
- List of Tables 13
- User Guide 14
- Intended Audience 15
- Related Materials 15
- Documentation Conventions 15
- License Agreements 16
- Technical Support 17
- Knowledge Database 18
- 1 Introduction 19
- Overview 20
- Interoperability 21
- 1–Introduction 22
- 1-4 IB0054606-02 A 22
- 2 Step-by-Step Cluster Setup 23
- Using MPI 24
- 3 InfiniBand 25
- Installed Layout 26
- IPoIB Administration 29
- IB Bonding 30
- Red Hat EL5 and EL6 31
- Subnet Manager Configuration 34
- 3–InfiniBand 36
- 3-12 IB0054606-02 A 36
- Default Configuration 37
- 3-14 IB0054606-02 A 38
- DQG[ 39
- [I 39
- [ 40
- IB0054606-02 A 3-17 41
- ScanFrequency 42
- Other Settings 43
- Changing the MTU Size 44
- Managing the ib_qib Driver 45
- Performance Tuning 49
- Default Parameter Settings 50
- AMD CPU Systems 52
- AMD Interlagos CPU Systems 52
- Intel CPU Systems 52
- IB0054606-02 A 3-31 55
- Compute Nodes 59
- Node Type Selection 60
- Test Execution 60
- Homogeneous Nodes 61
- Adapter and Other Settings 62
- Remove Unneeded Services 63
- Configuring for ssh 64
- Process Limitation with ssh 68
- 3-48 IB0054606-02 A 72
- 4 Running MPI on QLogic 73
- Create the mpihosts File 75
- Running Open MPI Applications 75
- To Use Another Compiler 77
- Table 4-3. Intel 78
- Process Allocation 79
- Open MPI 81
- IB0054606-02 A 4-9 81
- 4-10 IB0054606-02 A 82
- PSM_SHAREDCONTEXTS=0 82
- PSM_SHAREDCONTEXTS=NO 82
- Running in Shared Memory Mode 83
- Using Open MPI’s mpirun 85
- Environment for Node Programs 87
- Setting MCA Parameters 89
- Name Description 91
- IB0054606-02 A 4-21 93
- compile line 93
- is used by other 93
- Debugging MPI Programs 94
- The TotalView 95
- 4-24 IB0054606-02 A 96
- MVAPICH2 100
- Running MVAPICH2 Applications 101
- Platform MPI 8 102
- Intel MPI 103
- Installation 104
- 5–Using Other MPIs 108
- 5-12 IB0054606-02 A 108
- 6 SHMEM Description and 109
- SHMEM Programs 111
- Compiling SHMEM Programs 112
- Running SHMEM Programs 113
- Slurm Integration 116
- Sizing Global Shared Memory 117
- 6-10 IB0054606-02 A 118
- Progress Model 119
- Active Progress 120
- Passive Progress 120
- Environment Variables 121
- Implementation Behavior 123
- 6-16 IB0054606-02 A 124
- IB0054606-02 A 6-17 125
- Operation Calls 126
- SHMEM Benchmark Programs 135
- QLogic SHMEM reduce benchmark 138
- Option Description 139
- 6-32 IB0054606-02 A 140
- 7 Virtual Fabric support in 141
- Virtual Fabric Support 142
- Using SL and PKeys 142
- Using Service ID 143
- Adapters 144
- 8 Dispersive Routing 145
- 8–Dispersive Routing 146
- 8-2 IB0054606-02 A 146
- IB0054606-02 A 8-3 147
- 8-4 IB0054606-02 A 148
- IB0054606-02 A 9-1 149
- Required Steps 150
- Installing DHCP 151
- Configuring DHCP 152
- Netbooting Over IB 153
- HTTP Boot Setup 162
- IB0054606-02 A 9-15 163
- /etc/init.d/httpd start 163
- 9-16 IB0054606-02 A 164
- A Benchmark Programs 165
- Between Two Nodes 168
- (osu_mbw_mr) 170
- A–Benchmark Programs 172
- A-8 IB0054606-02 A 172
- IB0054606-02 A A-11 175
- A-12 IB0054606-02 A 176
- B SRP Configuration 177
- QLogic SRP Configuration 178
- Specifying a Session 179
- B–SRP Configuration 180
- B-4 IB0054606-02 A 180
- script as follows: 182
- Port Indexes 184
- Specifying a SRP Target Port 185
- Specifying an Adapter 186
- Restarting the SRP Module 187
- SRP Initiator port to another 190
- FVIC in Chassis 194
- 1. Review ib_qlgc_srp_query 197
- Native IB Storage SRP Driver” 198
- Native IB Storage SRP Driver 198
- OFED SRP Configuration 200
- B-26 IB0054606-02 A 202
- C Integration with a Batch 203
- C-4 IB0054606-02 A 206
- D Troubleshooting 207
- BIOS Settings 208
- InfiniPath 212
- SDP Module Not Loading 213
- Performance Issues 215
- Erratic Performance 216
- Open MPI Troubleshooting 218
- E–ULP Troubleshooting 225
- IB0054606-02 A E-7 225
- Troubleshooting SRP Issues 227
- Following is an example: 230
- E-14 IB0054606-02 A 232
- IB0054606-02 A E-15 233
- E-16 IB0054606-02 A 234
- IB0054606-02 A E-17 235
- Solution: 237
- E-20 IB0054606-02 A 238
- F–Write Combining 240
- F-2 IB0054606-02 A 240
- # ipath_mtrr 240
- F-4 IB0054606-02 A 242
- Restarting InfiniPath 244
- Program Name Function 245
- G–Commands and Files 247
- IB0054606-02 A G-5 247
- Sample output: 248
- G-20 IB0054606-02 A 262
- OS_version/updates 267
- G-30 IB0054606-02 A 272
- # modprobe -v ib_qib 272
- Common Tasks and Commands 274
- Function Command 275
- Table G-4. Useful Files 276
- G-38 IB0054606-02 A 280
- OpenFabrics 282
- Clusters 282
- Networking 282
- Other Software Packages 282
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