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- Outdated ipath_ether Configuration Setup Generates Error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
5–Using QLogic MPI
QLogic MPI Details
IB6054601-00 H 5-19
A
IPATH_UNIT This variable is for context sharing. When multiple
InfiniPath devices are present, this variable
restricts the use to a specific InfiniPath unit. By
default, all configured units are used in round
robin order.
Default: Unset
LD_LIBRARY_PATH This variable specifies the path to the run-time
library. It is often set in the .mpirunrc file.
Default: Unset
MPICH_CC This variable selects which compiler for mpicc,
and others, to use.
MPICH_CCC This variable selects which compiler for mpicxx,
and others, to use.
MPICH_F90 This variable selects which compiler for mpif90,
and others, to use.
MPIHOSTS This variable sets the name of the machines
(mpihosts) file.
Default: Unset
MPI_NPROCS This variable specifies the number of MPI pro-
cesses to spawn.
Default: Unset
MPI_SHELL Specifies the name of the program to log into
remote hosts.
Default: ssh unless MPI_SHELL is defined.
PSM_DEVICES Non-QLogic MPI users can set this variable to
enable running in shared memory mode on a sin-
gle node. This variable is automatically set for
QLogic MPI.
Default: PSM_DEVICES="self,ipath"
PSC_MPIRUN_DEFAULTS_PATH This variable sets the path to a user-local mpirun
defaults file.
Default:
/opt/infinipath/etc/mpirun.defaults
PSM_SHAREDCONTEXTS This variable overrides automatic context sharing
behavior. YES is equivalent to 1 (see Default).
Default: PSM_SHAREDCONTEXTS=1
Table 5-7. Environment Variables (Continued)
Name Description