Add or Remove Virtual Processors

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Add or Remove Virtual Processors

Add or Remove Virtual Processors:

|-- -p--+---+--number--+-AIO-+----------------------------------|
        '-+-'          +-SHM-+
                       +-TLI-+
                       +-SOC-+
                       '-FIF-'

Element	Purpose	Key Considerations
-p number	Adds or removes virtual processors. The number argument indicates the number of virtual processors to add or remove.	Restrictions: If this value is a negative integer, processors are removed. If this value is a positive integer, processors are added. You can use the -p option only when the database server is in online mode, and you can add to only one class of virtual processors at a time. You cannot add or remove a CPU virtual processor. Although you can add a FIF VP in online mode, you cannot drop it in online mode. Additional Information: If you are removing virtual processors, the maximum cannot exceed the actual number of processors of the specified type. If you are adding virtual processors, the maximum is less than 64 kilobytes, but it is recommended that the number of CPU VPs not be greater than the number of physical processors.

Element

Purpose

Key Considerations

-p number

Adds or removes virtual processors. The number argument indicates the number of virtual processors to add or remove.

Restrictions: If this value is a negative integer, processors are removed. If this value is a positive integer, processors are added. You can use the -p option only when the database server is in online mode, and you can add to only one class of virtual processors at a time.

You cannot add or remove a CPU virtual processor. Although you can add a FIF VP in online mode, you cannot drop it in online mode.

Additional Information: If you are removing virtual processors, the maximum cannot exceed the actual number of processors of the specified type. If you are adding virtual processors, the maximum is less than 64 kilobytes, but it is recommended that the number of CPU VPs not be greater than the number of physical processors.

Extended Parallel Server supports adding all virtual processor classes except CPU. Virtual processors of all classes except CPU and AIO can be dropped.

For more information on the types of virtual processors, see the chapter on virtual processors and threads in the IBM Informix: Administrator's Guide.