This parameter indicates that the corresponding CPU is a bitmap
    representing up to 1024 CPUs. Each bit set in this bitmap
    indicates that the corresponding CPU automatically attempts
    to join the active set in an OpenVMS symmetric multiprocessing
    environment when the instance is booted. A cleared bit indicates
    that the corresponding CPU is ignored only at boot time; if it is
    otherwise viable, the CPU can be started at a later time.

    SMP_CPU_BITMAP defaults to all bits set. (CPU 0 through CPU 1023
    are enabled for multiprocessing.) Note that the primary processor
    is always booted regardless of the setting of the corresponding
    bit in the CPU bitmap.

    To change the value of SMP_CPU_BITMAP in SYSBOOT or SYSGEN,
    specify a list of individual bits or contiguous groups of bits.
    For example:

       SYSGEN> SET SMP_CPU_BITMAP 0,5,17-21

    The command in this example sets bits 0, 5, 17, 18, 19, 20, and
    21 in the bitmap and clears all other bits.

    This parameter replaces the SMP_CPUS parameter.