The formula for velocity is:
where:
- using samples
- include:
- The number of samples of work using the processor
- The number of samples of work using non-paging DASD I/O resources (in a state of device connect).1
The I/O samples are derived from actual time measurements.
- delay samples
- include:
- The number of samples of work delayed for the processor
- The number of samples of work delayed for storage
- The number of samples of work delayed for non-paging DASD I/O.1
Work delayed for storage includes:- Paging
- Swapping
- Multiprogramming level (MPL)
- Server address space creation delays
- Initiation delays for batch jobs in WLM-managed job classes.
MPL is the SRM-controlled function that adjusts the number of address spaces allowed to be in central storage and ready to be dispatched.
I/O delays include:- IOS queue
- Subchannel pending
- Control unit queue delays
The samples for subchannel pending and control unit queue delay are derived from actual time measurements.