AIX - Performance Management - Overview

AIX - Performance Management - Overview

The base priority of a thread is 40. The nice value defaults to 20 for foreground processes and 24 for background processes.The CPUs on a system are shared among all of the threads by giving each thread a time slice of one clock tick (10 ms).
Install the bos.perf.tools (base tools), bos.sysmgt.trace, bos.perf.perfstat and perfagent.tools filesets. Commands no longer supported: bf (bigfoot), bfrpt, lockstat, stem, and syscalls.

topas
Reports selected local system statistics.

schedo
Manages CPU scheduler tunable parameters.
schedo -o 15 : changes the time slice of one clock tick to 15 ms.

bindprocessor
Binds or unbinds the kernel threads of a process to a processor.
bindprocessor 22358 2 : binds the threads in process 22358 to processor 2.

perfpmr
A set of tools and instructions for collecting the data needed to analyze a AIX performance problem.

fdpr
A performance tuning utility for improving execution time and real memory utilization of user-level application programs.

iostat
Reports CPU statistics and input/output statistics for the entire system, adapters, tty devices, disks and CD-ROMs.
iostat -s 2 4 : displays four reports at two second intervals starting with the sum of all activities (-s).
iostat -a : generates an adapter throughput report for all of the disk adapters.
lsattr -E -l sys0 -a iostat : displays the current iostat settings.
chdev -l sys0 -a iostat=false : disable the collection of iostat data.

lvmstat
Reports input/output statistics for LPs, LVs and VGs for hot-spot management.
lvmstat -v rootvg -e : enables statistics collection for all the LVs in VG rootvg.
lvmstat -v rootvg : reports statistics for all the LVs in VG rootvg.
lvmstat -v rootvg -C : clears the counter for VG rootvg.
lvmstat -l hd6 : reports statistics for LV hd6 (paging).
See migratelp to move LPs from one PP to another on a different PV.