DEC OSF/1 System Tuning and Performance Management

This document serves as a guide for system managers and programmers to diagnose and resolve performance issues within the DEC OSF/1 operating system. It aims to help users adjust applications and various system components to achieve better performance.

The manual is divided into three main sections:

1. Operating System Overview: Provides a foundational understanding of the system's architecture, including the Alpha AXP 64-bit architecture, process management, memory management (virtual memory, paging, swapping, and the Unified Buffer Cache - UBC), interprocess communication (IPC), and I/O subsystems (disks, file systems like UFS and AdvFS, and network systems).
2. Monitoring Your System: Describes numerous tools and techniques for identifying performance bottlenecks. Key monitoring tools discussed include ps, uptime, vmstat, swapon, iostat, dumpfs, dbx, netstat, and nfsstat, along with examples of their use to diagnose CPU, virtual memory, disk I/O, and network problems.
3. Tuning Subsystems and Applications: Offers comprehensive guidelines and specific adjustments for optimizing performance. This includes strategies for application optimization (compiler options, coding practices, data type and cache considerations), improving CPU utilization (job scheduling, kernel size), tuning memory (adjusting UBC, virtual memory parameters, and swap space configuration), and optimizing I/O (disk subsystems, UFS and AdvFS file systems, Common Access Method - CAM, and Network File System - NFS). The document stresses the importance of understanding the system's workload and making careful, incremental changes.