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- Outdated ipath_ether Configuration Setup Generates Error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 Limitations
5-26 IB6054601-00 H
S
The following features of QLogic MPI facilitate debugging:
Stack backtraces are provided for programs that crash.
The -debug and -debug-no-pause options are provided for mpirun.
These options make each node program start with debugging enabled. The
-debug option allows you to set breakpoints, and start running programs
individually. The -debug-no-pause option allows postmortem inspection.
Be sure to set -q 0 when using -debug.
Communication between mpirun and node programs can be printed by
specifying the mpirun
-verbose option.
MPI implementation debug messages can be printed by specifying the
mpirun -psc-debug-level option. This option can substantially impact
the performance of the node program.
Support is provided for progress timeout specifications, deadlock detection,
and generating information about where a program is stuck.
Several misconfigurations (such as mixed use of 32-bit/64-bit executables)
are detected by the runtime.
A formatted list containing information useful for high-level MPI application
profiling is provided by using the
-print-stats option with mpirun.
Statistics include minimum, maximum, and median values for message
transmission protocols as well as a more detailed information for expected
and unexpected message reception. See “MPI Stats” on page D-31 for more
information and a sample output listing.
QLogic MPI Limitations
The current version of QLogic MPI has the following limitations:
There are no C++ bindings to MPI; use the extern C MPI function calls.
In MPI-IO file I/O calls in the Fortran binding, offset, or displacement
arguments are limited to 32 bits. Thus, for example, the second argument of
MPI_File_seek must be between -2
31
and 2
31
-1, and the argument to
MPI_File_read_at must be between 0 and 2
32
-1.
NOTE:
The TotalView
®
debugger can be used with the Open MPI supplied in this
release. Consult the TotalView documentation for more information.