Managing Virtual Processors

You can use the onmode and onstat utilities to manage virtual processors. For additional information about onmode and onstat, refer to the IBM Informix: Administrator's Reference.

Adding and Dropping Virtual Processors

You can add or drop virtual processors in a user-defined VP class or in the CPU VP class while the database server is online. Use onmode -p to add virtual processors to the class. For example, the following command adds two virtual processors to the newvp class:

onmode -p +2 newvp

Monitoring Virtual-Processor Classes

You can monitor VPs with the onstat utility. The -g glo option prints information about global multithreading such as CPU use of virtual processors and total number of sessions. A user-defined VP class appears in the onstat -g glo output as a new process.