A computing system for allocating Virtual Network Functions, VNF, in a datacenter, the computing system comprising: a processing unit ; a computation module configured to, for each VNF of a plurality of incoming VNFs to the computing system: define an extinction factor corresponding to a datacenter unit in the datacenter based on a state of the datacenter, a VNF catalogue and a set of allocation rules , wherein the extinction factor indicates how many times an incoming VNF could be placed in the datacenter unit, wherein the VNF catalogue is a file that contains information on the plurality of incoming VNFs to the computing system in sequential order , and wherein the state of the datacenter indicates available computing resources of datacenter units in the datacenter; and in response to the defined extinction factor, determine an allocation model based on the VNF catalogue , the set of allocation rules , the extinction factor, and the state of the datacenter, wherein the allocation model indicates a datacenter unit of the datacenter to which the VNF is to be allocated; and an allocation module configured to allocate the VNF in the datacenter based on the allocation model, wherein if a VNF can be allocated in more than one datacenter unit, the allocation module is further configured to allocate the VNF to the datacenter unit that extincts the allocation of a fewest number of future VNFs. a processing unit ; a computation module configured to, for each VNF of a plurality of incoming VNFs to the computing system: define an extinction factor corresponding to a datacenter unit in the datacenter based on a state of the datacenter, a VNF catalogue and a set of allocation rules , wherein the extinction factor indicates how many times an incoming VNF could be placed in the datacenter unit, wherein the VNF catalogue is a file that contains information on the plurality of incoming VNFs to the computing system in sequential order , and wherein the state of the datacenter indicates available computing resources of datacenter units in the datacenter; and in response to the defined extinction factor, determine an allocation model based on the VNF catalogue , the set of allocation rules , the extinction factor, and the state of the datacenter, wherein the allocation model indicates a datacenter unit of the datacenter to which the VNF is to be allocated; and define an extinction factor corresponding to a datacenter unit in the datacenter based on a state of the datacenter, a VNF catalogue and a set of allocation rules , wherein the extinction factor indicates how many times an incoming VNF could be placed in the datacenter unit, wherein the VNF catalogue is a file that contains information on the plurality of incoming VNFs to the computing system in sequential order , and wherein the state of the datacenter indicates available computing resources of datacenter units in the datacenter; and in response to the defined extinction factor, determine an allocation model based on the VNF catalogue , the set of allocation rules , the extinction factor, and the state of the datacenter, wherein the allocation model indicates a datacenter unit of the datacenter to which the VNF is to be allocated; and an allocation module configured to allocate the VNF in the datacenter based on the allocation model, wherein if a VNF can be allocated in more than one datacenter unit, the allocation module is further configured to allocate the VNF to the datacenter unit that extincts the allocation of a fewest number of future VNFs. <EOS>