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- Outdated ipath_ether Configuration Setup Generates Error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
4–InfiniPath Cluster Setup and Administration
Performance Settings and Management Tips
4-24 IB6054601-00 H
S
If you are using Network File System (NFS) or yellow pages (yp) passwords:
rpcidmapd
ypbind
portmap
nfs
nfslock
autofs
To watch for disk problems, use:
smartd
readahead
The service comprising the InfiniPath driver and SMA is:
openibd
Other services may be required by your batch queuing system or user community.
If your system is running the daemon irqbalance, QLogic recommends turning
it off. Disabling irqbalance will enable more consistent performance with
programs that use interrupts. Use this command:
# /sbin/chkconfig irqbalance off
See “Erratic Performance” on page D-11 for more information.
Disable Powersaving Features
If you are running benchmarks or large numbers of short jobs, it is beneficial to
disable the powersaving features, since these features may be slow to respond to
changes in system load.
For RHEL4, RHEL5, and RHEL6, run this command as a root user:
# /sbin/chkconfig --level 12345 cpuspeed off
For SLES 10, run this command as a root user:
# /sbin/chkconfig --level 12345 powersaved off
After running either of these commands, reboot the system for the changes to
take effect.
Hyper-Threading
If you are using Intel NetBurst
®
Processors that support Hyper-Threading, QLogic
recommends turning off Hyper-Threading in the BIOS, which will provide more
consistent performance. You can check and adjust this setting using the BIOS
Setup utility. For specific instructions, follow the hardware documentation that
came with your system.