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 method directors and AIX technical aid pros to allow them to use the functionality instruments successfully and interpret the outputs whilst examining AIX procedure performance.A common suggestion and advent 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 subject matters, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.
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Extra resources for AIX 5L Performance Tools Handbook
The major performance issue for disk drives is usually application-related; that is, whether large numbers of small accesses will be made (random), or smaller numbers of large accesses (sequential). For random access, performance will generally be better using larger numbers of smaller capacity drives. The opposite situation exists for sequential access (use faster drives or use striping with larger number of drives). Physical disk buffers The Logical Volume Manager (LVM) uses a construct called a pbuf to control a pending disk I/O.
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.
If the primary is busy, the system checks the secondary. If it is not busy, the read is initiated on the secondary. If the secondary is busy, the read is initiated on the copy with the least number of outstanding I/Os. Writes are initiated concurrently. Parallel/sequential The parallel/sequential policy always initiates reads on the primary copy. Writes are initiated concurrently. Parallel/round robin The parallel/round robin policy is similar to the parallel policy except that instead of always checking the primary copy first, it alternates between the copies.
AIX 5L Performance Tools Handbook by IBM Redbooks