SET Use the SET co •• and to establish system performs various functions to control the
options.
parameters. The SET command CP system and virtual machine The format of the Class A SET co.mand is: SET r ,
AFFinity [userid] ION I 10FFI Inn I L CPAssist
FAVORed
r ,
userid Ixx I IOFFI L .J r ,
JOurnal
1 {LOgOn} LInk ION I 10FFI REServe userid SASsist L {
XX
) OFF f {
ON}
[[PROC[nn]] OFF PRIORity userid nn
1The JOURNAL operand is valid only if STQUERY=YES is specified in
the SYSJRL macro instruction D!KSYS. r , AFFINITY [userid] lOB I IOFFI Inn I L (Attached processor system only) sets affinity for the
specified userid. If userid is omitted, affinity is set or
reset for the user who issued the co.mand. If 01 is specified
(specifically or by default), the value in the user's
directory entry is used. The value nn must be the hexadecimal (00-3F) processor address of an' installed processor of an
attached processor system. Affinity restricts execution of
the virtual machine to the specified processor, but does not
restrict CP code executed on behalf of a virtual machine to any processor.
Section 3. CP Commands 139
CPASSIST {ON } OFF sets CP assist to the active or the nonactive state. If CP
assist is active, functions normally executed by various
sections of CP routines are executed by processor hardware
logic. This function made active on VM/370 initialization, a
part of VM/370 Extended Control-Program Support (VM/370 ECPS), is available on System/370 models and 148.
Expanded virtual machine assist, another part of V8/370 ECPS, is also controlled by the SET CPASSIST ON and OFF operands.
Expanded virtual machine assist, an extension of function
provided by virtual machine assist, is set to the active state
upon '"/370 system initialization. Thereafter, to enable this
function, both SET CPASSIST ON and SET SASSIST ON commands must be invoked. To set expanded virtual machine assist to
the inactive state, use either SET CPASSIST OFF or SET SASSIST OFF. r , FAVORED userid Ixx I 10FFI L .J
sets the favored execution performance option for the
specified user (userid). The FAVORED function with percentage
(xx) specified can be in effect for only one virtual machine at any time. If xx (percentage values from 1 to 99 are valid)
is specified, VM/370 attempts to provide up to the specified
percentage of processor time to that virtual machine, provided
that virtual machine can fully utilize the processor time. At regular time intervals, the VM/310 dispatcher checks the
processor time used by the particular virtual machine; if the
percentage has been exceeded, the virtual machine is given his normal priority usage for the remainder of the interval. If
the percentage is low, the virtual machine is assigned highest
priority for the remainder of the interval. If OFF is
specified, the specified virtual machine is removed frem FAVORED status. If neither xx nor OFF is specified, the
virtual machine designated is always dispatchable; that is,
any time it is ready to use processor time, it is .given preference over other usets with the same priority. Multiple users may be classified as favored if they have no percentage
assigned; however, only one user may be designated in a single SET command. r , JOURNAL {LOGOI} 101 ! LINK IOFFI L .J
sets the status of the LOGON and LINK journaling functions. RESERVE user id {xx } OFF the reserved page performance oFtion for the specified user (userid). This performance option can be applied to only
one virtual machine at any time. The specified virtual
machine uses only the specified number of page frames (xx) for
its exclusive use. If the number of page frames does not
equal the most active pages, the virtual machine will
experience performance degradation. The page frames are not
locked and the virtual machine can also use other available
page frames; however, no other virtual machine can use a
reserved page frame unless all other available page frames 140 V"/370 Operator's Guide
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