As a rule, two host CPUs per Avanti instance are recommended.  This ensures sufficient host system resources are available to handle peak application loads on the emulators, particularly I/O loads.  If sufficient CPUs are not available to the host, it will begin to utilize one or more CPUs dedicated to the Avanti instances.  This will adversely impact overall performance of the Avanti instances.  Implementing Avanti instances on a host system at a greater than 1 – 2 ratio of Avanti to host CPUs is a process that should be done carefully and monitored closely.