AFF_NPROCS

onconfig.std value

0

units

Number of CPUs

range of values

0 through number of CPUs in the computer

takes effect

When the database server shuts down and restarts

refer to

The following material:

• Virtual-processor classes, in the chapter on virtual processors and threads in the IBM Informix Administrator's Guide
• AFF_SPROC
• VPCLASS

On multiprocessor computers that support processor affinity, AFF_NPROCS specifies the number of CPUs to which the database server can bind CPU virtual processors. Binding a CPU virtual processor to a CPU causes the virtual processor to run exclusively on that CPU. The database server assigns CPU virtual processors to CPUs in serial fashion, starting with the processor number that AFF_SPROC specifies.

If you specify more CPU virtual processors than there are processors, the database server starts over again at the beginning. For example, if you set AFF_NPROCS to 3 and AFF_SPROCS to 5, the database server assigns two CPU virtual processors to processor 5, two CPU virtual processors to processor 6, and one CPU virtual processor to processor 7.