HP OpenVMS DCL Dictionary
START/CPU
Starts the specified secondary processor or processors (and any
associated vector processors). The /CPU qualifier is required.
Applies only to OpenVMS multiprocessing systems. Requires
CMKRNL (change mode to kernel) privilege.
Format
START/CPU [cpu-id[,...]]
Parameter
cpu-id[,...]
Specifies a decimal value representing the identity of a processor in a
OpenVMS multiprocessing system. On a VAX 6000 system or an Alpha 7000
system, the CPU ID is the backplane slot number of the processor. If
you do not specify a CPU ID and do not include the /ALL qualifier, the
START/CPU command selects a single available processor to join the
multiprocessing system.
Description
The START/CPU command starts a secondary processor in a OpenVMS
multiprocessing system.
You can issue a START/CPU command only for processors in the STOPPED or
TIMOUT state, as represented by the SHOW CPU command; otherwise, the
START/CPU command has no effect.
Qualifiers
/ALL
Selects all remaining processors in the system's available set to join
the multiprocessing system.
/DEFAULT_CAPABILITIES
Eliminates all previous capability (user and system) modifications for
the specified CPU and reinitializes them with the values in the global
initialization variable SCH$GL_DEFAULT_CPU_CAP.
Normally, user capabilities survive CPU shutdowns and restarts (not
reboots), making the downtime as transparent to the user as possible.
The CPU user capability bits are only initialized from
SCH$GL_DEFAULT_CPU_CAP at the first boot of the CPU. (The system
capability bits, however, are reinitialized to their defaults taken
from SCH$GL_DEFAULT_CPU_CAP.)
However, there may be times when the CPU needs to be returned to a
known, consistent state. The /DEFAULT_CAPABILITIES qualifier mimics the
behavior of the initial bootstrap of the CPU.
/POWER[=ON] (Alpha/I64 only)
Powers on the CPU prior to bringing the CPU into the active set.
Supported only on AlphaServer GS series systems.
Examples
The START/CPU command in this example selects a single inactive
processor from the set of those processors that are currently available
but inactive. When it completes its initialization, the selected
processor becomes part of the system's active set and is capable of
scheduling and executing processes.
The START/CPU command in this example selects the processors with CPU
IDs 4 and 7, if they are currently available and inactive. When they
complete initialization, these processors become part of the system's
active set and are capable of scheduling and executing processes.
The START/CPU/ALL command in this example selects all remaining
inactive and available processors. When they complete initialization,
these processors become part of the system's active set and are capable
of scheduling and executing processes.
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