Product specifications
Table Of Contents
- Table of Contents
- 1 Introduction
- 2 Feature Overview
- 3 Step-by-Step Cluster Setup and MPI Usage Checklists
- 4 InfiniPath Cluster Setup and Administration
- Introduction
- Installed Layout
- Memory Footprint
- BIOS Settings
- InfiniPath and OpenFabrics Driver Overview
- OpenFabrics Drivers and Services Configuration and Startup
- Other Configuration: Changing the MTU Size
- Managing the InfiniPath Driver
- More Information on Configuring and Loading Drivers
- Performance Settings and Management Tips
- Host Environment Setup for MPI
- Checking Cluster and Software Status
- 5 Using QLogic MPI
- Introduction
- Getting Started with MPI
- QLogic MPI Details
- Use Wrapper Scripts for Compiling and Linking
- Configuring MPI Programs for QLogic MPI
- To Use Another Compiler
- Process Allocation
- mpihosts File Details
- Using mpirun
- Console I/O in MPI Programs
- Environment for Node Programs
- Environment Variables
- Running Multiple Versions of InfiniPath or MPI
- Job Blocking in Case of Temporary InfiniBand Link Failures
- Performance Tuning
- MPD
- QLogic MPI and Hybrid MPI/OpenMP Applications
- Debugging MPI Programs
- QLogic MPI Limitations
- 6 Using Other MPIs
- A mpirun Options Summary
- B Benchmark Programs
- C Integration with a Batch Queuing System
- D Troubleshooting
- Using LEDs to Check the State of the Adapter
- BIOS Settings
- Kernel and Initialization Issues
- OpenFabrics and InfiniPath Issues
- Stop OpenSM Before Stopping/Restarting InfiniPath
- Manual Shutdown or Restart May Hang if NFS in Use
- Load and Configure IPoIB Before Loading SDP
- Set $IBPATH for OpenFabrics Scripts
- ifconfig Does Not Display Hardware Address Properly on RHEL4
- SDP Module Not Loading
- ibsrpdm Command Hangs when Two Host Channel Adapters are Installed but Only Unit 1 is Connected to the Switch
- Outdated ipath_ether Configuration Setup Generates Error
- System Administration Troubleshooting
- Performance Issues
- QLogic MPI Troubleshooting
- Mixed Releases of MPI RPMs
- Missing mpirun Executable
- Resolving Hostname with Multi-Homed Head Node
- Cross-Compilation Issues
- Compiler/Linker Mismatch
- Compiler Cannot Find Include, Module, or Library Files
- Problem with Shell Special Characters and Wrapper Scripts
- Run Time Errors with Different MPI Implementations
- Process Limitation with ssh
- Number of Processes Exceeds ulimit for Number of Open Files
- Using MPI.mod Files
- Extending MPI Modules
- Lock Enough Memory on Nodes When Using a Batch Queuing System
- Error Creating Shared Memory Object
- gdb Gets SIG32 Signal Under mpirun -debug with the PSM Receive Progress Thread Enabled
- General Error Messages
- Error Messages Generated by mpirun
- MPI Stats
- E Write Combining
- F Useful Programs and Files
- G Recommended Reading
- Glossary
- Index
B–Benchmark Programs
Benchmark 3: Messaging Rate Microbenchmarks
B-4 IB6054601-00 H
S
Benchmark 3: Messaging Rate Microbenchmarks
mpi_multibw is the microbenchmark that highlights QLogic’s messaging rate
results. This benchmark is a modified form of the OSU NOWlab’s osu_bw
benchmark (as shown in the previous example). It has been enhanced with the
following additional functionality:
The messaging rate and the bandwidth are reported.
N/2 is dynamically calculated at the end of the run.
You can run multiple processes per node and see aggregate bandwidth and
messaging rates.
The benchmark has been updated with code to dynamically determine which
processes are on which host. Here is an example output when running
mpi_multibw:
$ mpirun -np 16 -ppn 8 ./mpi_multibw
This will run on eight processes per node. Typical output might look like:
# PathScale Modified OSU MPI Bandwidth Test
(OSU Version 2.2, PathScale $Revision$)
# Running on 8 procs per node (uni-directional traffic for each
process pair)
# Size Aggregate Bandwidth (MB/s) Messages/s
1 26.890668 26890667.530474
2 53.692685 26846342.327320
4 107.662814 26915703.518342
8 214.526573 26815821.579971
16 88.356173 5522260.840754
32 168.514373 5266074.141949
64 503.086611 7860728.303972
128 921.257051 7197320.710406
256 1588.793989 6206226.519112
512 1716.731626 3352991.457783
1024 1872.073401 1828196.680564
2048 1928.774223 941784.288727
4096 1928.763048 470889.416123
8192 1921.127830 234512.674597
16384 1919.122008 117133.911629
32768 1898.415975 57935.057817
65536 1953.063214 29801.379615
131072 1956.731895 14928.679615
262144 1957.544289 7467.438845
524288 1957.952782 3734.498562
1048576 1958.235791 1867.519179
2097152 1958.333161 933.806019
4194304 1958.400649 466.919100