MPL adjustment control

The OPT provides keywords to specify upper and lower thresholds for the variables that SRM uses to determine if it should increase, decrease, or leave the MPL unchanged. When one of these variables exceeds its threshold value, SRM regards this change as a signal to adjust the MPL. Table 1 summarizes the internal names for the control variables, their thresholds, and conditions that can influence a change.

Table 1. Summary of MPL adjustment control
Control variable and internal name	Thresholds that can influence an MPL change:		Keyword in OPT
Control variable and internal name	decrease	increase	Keyword in OPT
CPU utilization (RCVCPUA)	>RCCCPUTH	<RCCCPUTL	RCCCPUT
Page fault rate (RCVPTR)	>RCCPTRTH	<RCCPTRTL	RCCPTRT (see note)
UIC (RCVUICA)	<RCCUICTL	>RCCUICTH	RCCUICT
Percentage of online storage fixed (RCVFXIOP)	>RCCFXTTH	<RCCFXTTL	RCCFXTT
Percentage of storage that is fixed within the first 16 megabytes (RCVMFXA)	>RCCFXETH	<RCCFXETL	RCCFXET
Note: The default thresholds for this keyword causes the corresponding control variable to have no effect on MPL adjustment.