Download e-book for iPad: AIX 5L Performance Tools Handbook by IBM Redbooks

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 method directors and AIX technical help execs to allow them to use the functionality instruments successfully and interpret the outputs while examining AIX procedure performance.A normal inspiration 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 booklet 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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Kernel threads are owned by a process. A process has one or more kernel threads. The advantage of threads is that you can have multiple threads running in parallel on different CPUs on a Symmetrical Multiprocessor System (SMP). Applications can be designed to have user level threads that are scheduled to work by the application or by the pthreads scheduler in libpthreads. Multiple threads of control allow an application to service requests from multiple users at the same time. Application threads can be mapped to kernel threads in a 1:1 or an n:1 relation.

A thread requesting such a lock is put to sleep if the lock is not available. The thread is put back to the run queue if the lock becomes available. There in an additional overhead for context switching and dispatching for sleeping locks. AIX provides two types of locks, which are: Read-write lock Multiple readers of the data are allowed, but write access is mutually exclusive. The read-write lock has three states: Exclusive write Shared read Unlocked Mutual exclusion lock Only one thread can access the data at a time.

In other words, do not design the system to be 100 percent busy from the start of the project. More information on system sizing can be found in the redbook Understanding IBM ^ pSeries Performance and Sizing, SG24-4810. When a system in a productive environment still meets the performance expectations for which it was initially designed, but the demands and needs of the utilizing organization has outgrown the system’s basic capacity, performance tuning is performed to avoid and/or delay the cost of adding or replacing hardware.

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