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HP OpenVMS System Manager's Manual, Volume 2:... |
Managing Special Processing Environments |
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Creating a Multiprocessing Environment
You can control the membership and character of a multiprocessing
system at boot time by setting system parameters designed for these
purposes. Among the system parameters that manage a multiprocessing system
are the following parameters:
| Parameter | Function |
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MULTIPROCESSING
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Determines which synchronization
image is loaded into the operating system at boot time
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SMP_CPUS
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Determines which processors are brought
into the multiprocessing environment from the available set at boot
time
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For more information about these and other system parameters, refer to the HP OpenVMS System Management Utilities Reference Manual.
You
can add an available processor to the active set at boot time, or
you can add it later using the DCL command START/CPU. The DCL command STOP/CPU removes a processor from the active set.
SMP Extension License
On Alpha and I64 systems, you must register the SMP Extension License if you have an SMP system. This license upgrades the Operating System Base License and all Interactive User licenses to the matching multiprocessing level of your system.
Because the SMP Extension License grants all the rights the existing Base and User licenses provide at the uniprocessing level, reinstalling those licenses when you upgrade to a multiprocessing system is unnecessary. When your system is upgraded to a new multiprocessing level, add an SMP Extension License to your existing license.
Monitoring a Multiprocessing Environment
Several
operating system features provide special information about the
character, capabilities, and status of a multiprocessor system.
They include the DCL command SHOW CPU and the Monitor utility.
Obtaining Information About a Multiprocessor Configuration
The SHOW CPU command displays three levels of information describing
the configuration and status of a multiprocessing system:
| Level | Command Example | Display Contents |
|---|---|---|
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Summary
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SHOW CPU
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Indicates which processor
is primary, which processors are configured, and which processors
are active; displays the minimum revision levels for processors
in the system and the setting of the MULTIPROCESSING system parameter;
and indicates whether multiprocessing is enabled.
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Brief
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SHOW CPU/BRIEF
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Produces information from
the summary display; lists the current CPU state and the current
process (if any) for each configured processor.
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Full
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SHOW CPU/FULL
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Produces information from the summary
display and displays additional information; lists the current CPU state,
current process (if any), revision levels, and capabilities for
each configured processor; indicates which processes can be executed
only on certain processors.
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For more information about the DCL commands relating to SMP, refer to the HP OpenVMS DCL Dictionary; for information about the Monitor utility, refer to the MONITOR section in the HP OpenVMS System Management Utilities Reference Manual.
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