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Configures MPI transport protocol behavior like EAGER_LIMIT and polling intervals for optimal performance.
Optimizes file I/O operations using collective operations and file views for MPI applications.
Tunes HPS drivers by adjusting settings like spoolsize and rpoolsize for IP buffer pools.
Adjusts IP subsystem variables like sb_max and tcp_sendspace for improved network performance.
Manages the file cache to reduce overhead impact on large parallel applications.
Utilizes svmon and vmstat commands to analyze virtual memory usage and identify potential bottlenecks.
Configures Technical Large Pages (TLPs) to enhance application performance by improving memory access efficiency.
Ensures correct memory affinity settings for LPARs on p690 systems for optimal performance.
Manages RSCT daemons like IBM.ConfigRMd and hats_nim for optimal system operation.
Reduces the impact of LoadLeveler daemons by adjusting their frequency, communication, and logging.
Configures AIX 5L thread variables like AIXTHREAD_SCOPE for performance tuning.
Sets trace and debug levels for HPS links using the Isattr command for performance monitoring.
Checks available CPUs and their frequencies, crucial for parallel application performance.
Ensures correct memory affinity settings for LPARs on p690 systems for optimal performance.
Investigates packet drops on the HPS switch hardware and software for performance issues.
Uses AIX 5L trace to monitor daemon activity and identify CPU-consuming processes.
Lists essential IBM documentation for HPS planning, installation, and service.
Provides references for Parallel Environment for AIX 5L MPI documentation.
Lists AIX 5L performance management and tools guides for further tuning.
References IBM Redbooks and POWER4 guides for system tuning and architecture.
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