Determining how many CPUs you have on Solaris UNIX

Problem(Abstract)

The NUMCPUVP and newer VPCLASS onCONFIG parameter should be set to one less than the actual number of physical CPUs present in the server. This document provides the commands to determine the number of CPUs on Sun machines.

Resolving the problem

When tuning various IBM Informix® products you need to know the number of processors on your system. The NUMCPUVP or VPCLASS cpu ONCONFIG configuration parameter, for instance, should be set to one less than the actual number of physical CPUs present in the server. 

On Sun Solaris you can determine how many processors your system has by using the unamecommand. Use the -X option to uname (located in /usr/bin) and look for the value of the parameter NumCPU. The -X option displays expanded system information as expected by SCO UNIX. See the man page for more information on uname -X. Use this command line:

/usr/bin/uname -X

Example:

This example is from a machine with 4 CPUs. It also uses grep to limit the output.


$ uname -X | grep Num
NumCPU = 4

Note: Please contact Solaris for information regarding multi-core (e.g. T-5240) processors and threads.

Note: Please see the manuals and online documentation for NUMCPUVP and VPCLASS ONCONFIGconfiguration parameters.

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