VPCLASS Values and the SINGLE_CPU_VP Configuration Parameter

Informix® treats user-defined virtual-processor classes as if they were CPU virtual processors. If you set the SINGLE_CPU_VP configuration parameter to a nonzero value, you cannot create any user-defined virtual-processor classes.

Using a user-defined VPCLASS

If you set this configuration parameter to a nonzero value and then attempt to bring up the database server with a user-defined VPCLASS, you receive the following error message, and the database server initialization fails:
oninit: Cannot have SINGLE_CPU_VP non-zero and user-defined VP classes

Using the cpu VPCLASS

If you set this configuration parameter to a nonzero value and then attempt to bring up the database server with the VPCLASS cpu value for num set to a value greater than 1, you receive the following error message, and the database server initialization fails:
Cannot have SINGLE_CPU_VP non-zero and CPU VPs greater than 1.

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