Performance Tuning WebWizard

Expanation of SMP

CPU Bottleneck ???

Criteria: XXX

SMP monitor Statistics

The basic CPU usage is on the SMP Screen of nmon.
The statisics break what the CPU is doing into 4 types of activity.

Sys System or Kernel This is running the UNIX/AIX Operating System Kernel which includes scheduling processes, file I/O, paging, device drivers and running the network.
Wait Waiting for I/O This is idle time while waiting for Disk I/O to complete.
User Applications This is user processes i.e. your applications and database programs.
Idle Nothing to do This is when the CPU has nothing to do i.e. waiting to users to request some action

Notes:

These percentages should add up to 100%
The CPU is "doing something" useful in sys and user
The CPU has "nothing to do" in wait and idle
The only difference between wait and idle is that in wait the CPU could do something useful, if the disks were faster.
Another way to view it is wait is waiting for Disk I/O and idle is waiting for users (or possibly network).

What can you do to tune SMP?

If you find the CPU is 100% busy all the time:

Plan for an upgrade!!

Sys	System or Kernel	This is running the UNIX/AIX Operating System Kernel which includes scheduling processes, file I/O, paging, device drivers and running the network.
Wait	Waiting for I/O	This is idle time while waiting for Disk I/O to complete.
User	Applications	This is user processes i.e. your applications and database programs.
Idle	Nothing to do	This is when the CPU has nothing to do i.e. waiting to users to request some action