Set the -iqnumbercpus startup switch to specify the number of CPUs available. This parameter overrides the physical number of CPUs for resource planning purposes.
On machines with Intel® CPUs and hyperthreading enabled, set -iqnumbercpus to the actual number of cores
On machines where an operating system utility has been used to restrict SAP Sybase IQ to a subset of the CPUs within the machine
Administration: Database > Run Database Servers > Command Line Switches > Command Line Options for Performance > Memory Options > Number of CPUs Switch.