VMS Help START, /CPU  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    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[,...]]

1 - 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.

2 - Qualifiers

 2.1 - /ALL

    Selects all remaining processors in the system's available set to
    join the multiprocessing system.

 2.2 - /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.

3 - Examples

    1.$ START/CPU

      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.

    2.$ START/CPU 4,7

      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.

    3.$ START/CPU/ALL

      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.