Download AIX 5L Performance Tools Handbook by IBM Redbooks PDF

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 consequences in lots of examples.This ebook 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 while interpreting AIX process performance.A basic suggestion 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 ebook 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 issues, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.

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The vmtune command’s parameters that affect paging are: Chapter 1. Introduction to AIX performance monitoring and tuning 13 npswarn The operating system sends the SIGDANGER signal to all active processes when the amount of paging space left on the system goes below this threshold. 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.

The PFT contains flags that indicate which pages have been referenced and which have been modified. If the page stealer finds a page in the PFT that has been referenced, then it will not steal the page, but rather will reset the reference flag. The next time that the page stealer passes this page in the PFT, if it has not been referenced, it will be stolen. Pages that are not referenced when the page stealer passes them the first time are stolen. Chapter 1. Introduction to AIX performance monitoring and tuning 11 When the modify flag is set on a page that has not been referenced, it indicates to the page stealer that the page has been modified since it was placed in memory.

In a thrashing condition processes encounter a page fault almost as soon as they are dispatched. None of the processes make any significant progress and the performance of the system deteriorates. 12 AIX 5L Performance Tools Handbook The operating system has a memory load control mechanism that detects when the thrashing condition is about to start. Once thrashing is detected, the system starts to suspend active processes and delay the start of any new processes. The memory load control mechanism is disabled by default on systems with more than 128 MB of memory.

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