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8–Dispersive Routing
8-2 IB0054606-02 A
Internally, PSM utilizes dispersive routing differently for small and large
messages. Large messages are any messages greater-than or equal-to 64K. For
large messages, the message is split into message fragments of 128K by default
(called a window). Each of these message windows is sprayed across a distinct
path between ports. All packets belonging to a window utilize the same path
however the windows themselves can take a different path through the fabric.
PSM assembles the windows that make up an MPI message before delivering it to
the application. This allows limited out of order semantics through the fabrics to be
maintain with little overhead. Small messages on the other hand always utilize a
single path when communicating to a remote node however different processes
executing on a node can utilize different paths for their communication between
the nodes. For example, two nodes A and B each with 8 processors per node.
Assuming the fabric is configured for a LMC of 3, PSM constructs 8 paths through
the fabric as described above and a 16 process MPI application that spans these
nodes (8 process per node). Then:
Each MPI process is automatically bound to a given CPU core numbered
between 0-7. PSM does this at startup to get improved cache hit rates and
other benefits.
Small Messages sent from a process on core N will use path N.
For a large message, each process will utilize all of the 8 paths and spray
the windowed messages across it.
The above highlights the default path selection policy that is active in PSM when
running on non-zero LMC configured fabrics. There are 3 other path selection
policies that determine how to select the path (or path index from the set of
available paths) used by a process when communicating with a remote node. The
above path policy is called adaptive. The 3 remaining path policies are static
policies that assign a static path on job startup for both small and large message
transfers.
Static_Src: Only one path per process is used for all remote
communications. The path index is based on the CPU number the process
is running.
NOTE
Only path N will be used by this process for all communications to any
process on the remote node.
NOTE
Multiple paths are still used in the fabric if multiple processes (each on
a different CPU) are communicating.
- 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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