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- Outdated ipath_ether Configuration Setup Generates Error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
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Environment variables are specified in descending order, as follows:
1. Set in the default shell environment on a remote node, e.g., ~/.bashrc or
equivalents.
2. Set in -rcfile.
3. Set the current shell environment for the mpirun command.
4. If nothing has been set (none of the previous sets have been performed),
the default value of the environment variable is used.
As noted in the above list, using an mpirunrc file overrides any environment
variables already set by the user. You can set environment variables for the node
programs with the -rcfile option of mpirun with the following command:
$ mpirun -np n -m mpihosts -rcfile mpirunrc program_name
In the absence of this option, mpirun checks to see if a file called
$HOME/.mpirunrc exists in the user's home directory. In either case, the file is
sourced by the shell on each node when the node program starts.
The .mpirunrc command line cannot contain any interactive commands. It can
contain commands that output on stdout or stderr.
There is a global options file for mpirun arguments. The default location of this
file is:
/opt/infinipath/etc/mpirun.defaults
You can use an alternate file by setting the environment variable
$PSC_MPIRUN_DEFAULTS_PATH. See the mpirun man page for more
information.
Environment Variables
Table 5-7 contains a summary of the environment variables that are used by
InfiniPath and mpirun.
Table 5-7. Environment Variables
Name Description
MPICH_ROOT This variable is used by mpirun to find the
mpirun-ipath-ssh executable, set up
LD_LIBRARY_PATH, and set up a prefix for all
InfiniPath pathnames. This variable is used by the
--prefix argument (or is the same as --pre-
fix), if installing InfiniPath RPMs in an alternate
location.
Default: Unset