AFF_SPROC

onconfig.std
value

0

units

CPU number

range of values

0 through (AFF_NPROCS - NUMCPUVPS + 1)

takes effect

When shared memory is initialized

refer to

Virtual-processor classes in the chapter on virtual processors and threads in the IBM Informix: Administrator's Guide

On multiprocessor computers that support processor affinity, AFF_SPROC specifies the CPU, starting with 0, on which the database server starts binding CPU virtual processors to CPUs. The AFF_NPROCS parameter specifies the number of CPUs that the database server will use. The NUMCPUVPS parameter specifies the number of CPU virtual processors to be started, and the AFF_SPROC parameter specifies the CPU on which the first virtual processor is to start. For example, if you assign eight CPUs (AFF_NPROCS = 8), and set NUMCPUVPS to 3 and AFF_SPROC to 5, the database server binds CPU virtual processors to the fifth, sixth, and seventh CPUs.

On parallel-processing platforms that support processor affinity, AFF_SPROC specifies the CPU at which the database server or coserver starts binding CPU virtual processors to CPUs. The AFF_NPROCS parameter specifies the number of CPUs to be assigned to the database server or coserver.