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- Outdated ipath_ether Configuration Setup Generates Error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
4-22 IB6054601-00 H
S
Performance Settings and Management Tips
The following sections provide suggestions for improving performance and
simplifying cluster management. Many of these settings will be done by the
system administrator. User level runtime performance settings are shown in
“Performance Tuning” on page 5-21.
Homogeneous Nodes
To minimize management problems, the compute nodes of the cluster should
have very similar hardware configurations and identical software installations. A
mismatch between the InfiniPath software versions can also cause problems. Old
and new libraries must not be run within the same job. It may also be useful to
distinguish between the InfiniPath-specific drivers and those that are associated
with kernel.org, OpenFabrics, or are distribution-built. The most useful tools are:
ident (see “ident” on page F-6)
ipathbug-helper (see “ipathbug-helper” on page F-6)
ipath_checkout (see “ipath_checkout” on page F-7)
ipath_control (see “ipath_control” on page F-8)
mpirun (see “mpirun” on page F-12)
rpm (see “rpm” on page F-13)
strings (see “strings” on page F-13)
Adapter and Other Settings
The following adapter and other settings can be adjusted for better performance.
Use taskset to tune CPU affinity on Opteron systems with the
QLE7240, QLE7280, and QLE7140. Latency will be slightly lower for the
Opteron socket that is closest to the PCI Express bridge. On some chipsets,
bandwidth may be higher on this socket. See “Performance Tuning” on
page 5-21 for more information on taskset. Also see the taskset(1)
man page.
Use an IB MTU of 4096 bytes instead of 2048 bytes, if available, with
the QLE7240, QLE7280, and QLE7140. 4K MTU is enabled in the
InfiniPath driver by default. To change this setting for the driver, see “Other
Configuration: Changing the MTU Size” on page 4-18.
NOTE:
Run these tools to gather information before reporting problems and
requesting support.