Performance control by I/O-to-processing ratio (non-APPC)

The performance control described in this topic is not supported in an APPC scheduling environment.

To regulate how a job is scheduled by JES3, code an IORATE parameter:

   //*MAIN IORATE=xxx

The IORATE parameter indicates if the job contains a low, medium, or high number of I/O instructions compared to the number of processing instructions. JES3 uses this value to determine the mix of jobs assigned to a processor: using this parameter, JES3 balances processor-bound processing with I/O-bound processing. A correct balance improves throughput.

Examples:

//*MAIN IORATE=HIGH
//*MAIN IORATE=LOW
//*MAIN IORATE=MED