Technical data

System Management Features
4.12 New System Parameters
4.12.5 LCKMGR_MODE (Alpha)
The LCKMGR_MODE parameter controls usage of the Dedicated CPU Lock
Manager. Setting LCKMGR_MODE to a number greater than zero (0) indicates
the number of CPUs that must be active before the Dedicated CPU Lock Manager
is turned on.
The Dedicated CPU Lock Manager performs all locking operations on a single
dedicated CPU. This can improve system performance on large SMP systems with
high MP_Synch associated with the lock manager.
For more information about usage of the Dedicated CPU Lock Manager, see the
OpenVMS Performance Management manual.
Specify one of the following:
Value Description
0 Indicates the Dedicated CPU Lock Manager is off. (The default.)
>0 Indicates the number of CPUs that must be active before the Dedicated
CPU Lock Manager is turned on.
LCKMGR_MODE is a DYNAMIC parameter.
4.12.6 NPAGECALC
NPAGECALC controls whether the system automatically calculates the initial
size for nonpaged dynamic memory.
Compaq sets the default value of NPAGECALC to 1 only during the initial boot
after an installation or upgrade. When the value of NPAGECALC is 1, the
system calculates an initial value for the NPAGEVIR and NPAGEDYN system
parameters. This calculated value is based on the amount of physical memory in
the system.
NPAGECALC’s calculations do not reduce the values of NPAGEVIR and
NPAGEDYN from the values you see or set at the SYSBOOT prompt. However,
NPAGECALC’s calculation might increase these values.
AUTOGEN sets NPAGECALC to 0. NPAGECALC should always remain 0
after AUTOGEN has determined more refined values for the NPAGEDYN and
NPAGEVIR system parameters.
4.12.7 NPAGERAD (Alpha)
NPAGERAD specifies the total number of bytes of nonpaged pool that will be
allocated for Resource Affinity Domains (RADs) other than the base RAD. For
platforms that have no RADs, NPAGERAD is ignored. Notice that NPAGEDYN
specifies the total amount of nonpaged pool for all RADs.
Also notice that the OpenVMS system might round the specified values higher
to an even number of pages for each RAD, which prevents the base RAD from
having too little nonpaged pool. For example, if the hardware is an AlphaServer
GS160 with 4 RADs:
NPAGEDYN = 6291456 bytes
NPAGERAD = 2097152 bytes
4–16 System Management Features