AFF_NPROCS

onconfig.std
value

0

units

Number of CPUs

range of values

0 through number of CPUs in a node or a computer

takes effect

When shared memory is initialized

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

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.

Extended Parallel Server can run on the following types of parallel-processing platforms:

• Massively parallel processing (MPP) systems composed of multiple computers that are connected to a single high-speed communication subsystem
• Clusters of stand-alone computers that are connected over a high-speed network
• Symmetric multiprocessing (SMP) computers

On parallel-processing platforms that support processor affinity, AFF_NPROCS specifies the number of CPUs to which the database server or coserver binds CPU virtual processors. Binding a CPU virtual processor to a CPU causes the virtual processor to run exclusively on that CPU. The database server or coserver assigns CPU virtual processors to CPUs in serial fashion, starting with the processor number that AFF_SPROC specifies.