HP-MPI User's Guide (11th Edition)

Tuning
Chapter 5182
• Message latency and bandwidth
• Multiple network interfaces
• Processor subscription
• Processor locality
• MPI routine selection
• Multilevel parallelism
• Coding considerations
• Using HP Caliper
The tuning information in this chapter improves application
performance in most but not all cases. Use this information together with
the output from counter instrumentation to determine which tuning
changes are appropriate to improve your application’s performance.
When you develop HP-MPI applications, several factors can affect
performance. These factors are outlined in this chapter.