By IBM Redbooks
This IBM Redbook takes an insightful examine the functionality tracking and tuning instruments which are supplied with AIX 5L. It discusses using the instruments in addition to the translation of the implications in lots of examples.This publication is intended as a reference for approach directors and AIX technical aid pros to allow them to use the functionality instruments successfully and interpret the outputs whilst reading AIX procedure performance.A common notion and creation to the instruments is gifted to introduce the reader to the method of AIX functionality analysis.The person functionality instruments mentioned during this publication fall into those categories:- Multi-resource tracking and tuning instruments- CPU-related functionality instruments- Memory-related functionality instruments- Disk I/O-related functionality instruments- Network-related functionality instruments- functionality tracing instruments- extra functionality themes, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.
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Additional info for AIX 5L Performance Tools Handbook
Fixed priority threads will be placed on the global run queue if you run schedtune -F1. 6 Time slices The CPUs on the system are shared amongst all the threads by giving each thread a certain slice of time to run. The default time slice of one clock tick (10 ms) can be changed using schedtune -t. Sometimes increasing the time slice improves system throughput due to reduced context switching. The vmstat and sar commands show the amount of context switching. If you see a high value of context switches, then increasing the time slice can improve performance.
A process can either ignore the signal or it can release memory pages using the disclaim() subroutine. npskill The operating system will begin killing processes when the amount of paging space left on the system goes below this threshold. When the npskill threshold is reached, the operating system sends a SIGKILL signal to the youngest process. Processes that are handling a SIGDANGER signal and processes that are using the EPSA policy are exempt from being killed. nokilluid By setting the value of the nokilluid value to 1 (one), the root processes will be exempt from being killed when the npskill threshold is reached.
1, “TCP/IP protocols” on page 31. 2, “Network tunables” on page 32. Chapter 1. Introduction to AIX performance monitoring and tuning 29 The knowledge of the network topology used is necessary to understand and detect possible performance bottlenecks on the network. This includes information about the routers and gateways used, the Maximum Transfer Unit (MTU) used on the network path between the systems, and the current load on the networks used. This information should be well documented, and access to these documents needs to be guaranteed at any time.
AIX 5L Performance Tools Handbook by IBM Redbooks