z/VM: CP Commands and Utilities Reference - z/VM - IBM

SET SRM
SET SRM
►►
Set
SRM
Authorization
Purpose
Operands
90 2
IABias
mmm nnn
DSPSlice
%
INITial
minslice
STORBuf aaa bbb
%
INITial
%
LDUBuf ddd eee
%
INITial
%
DSPBuf iiiii jjjjj kkkkk
MAXWSS
INITial
storpct
%
XSTORE
OFF
xstpct
%
Privilege Class: A
1390 z/VM: CP Commands and Utilities Reference
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Use SET SRM to change system parameters.
%
%
IABias [mmm[% ] nnn]
specifies the new “interactive bias” to take effect. An interactive bias with a
nonzero mmm causes users doing trivial transactions to receive better service
than their scheduling share would otherwise entitle them to receive. Interactive
bias causes a user’s share of the system to be momentarily larger than normal
at the start of a new transaction. As the transaction progresses, the user’s
share fades back to normal. This means that transactions requiring only a small
fraction of processing time get good response time.
The value mmm is a percentage of the distance from the user’s normal
dispatch-list position to the topmost user. It controls the “intensity” of the
interactive bias. This value is a decimal number from 0 to 100, with IPL and
default values of 90. The intensity determines where in the dispatch list the user
is inserted for the first minor time slice at the start of a new transaction. The
insertion point is somewhere between the normal (unbiased) insertion point and
the topmost user in the list. A value of 100 gives a very strong interactive bias,
and 0 eliminates the interactive bias.
The value nnn controls the duration of the interactive bias. This value is a
decimal number from 1 to 100, with IPL and default values of 2. The duration
specifies the number of minor time slices it takes for users to fade back to their
normal position in the dispatch list after the initial interactive boost. For
example, a setting of 3 means the boost to the user lasts for 3 minor time
slices. The effect is strongest on the first time slice and fades away until on the
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