321Simulation Tools for Cloud Computing
between CloudSim entities and components. All components in CloudSim communicate through
message passing operations. The second layer consists of several sublayers that model the core ele-
ments of cloud computing. The cloud resources sublayers model datacenter, cloud coordinator, and
network topology between different datacenters.
A network ow model for cloud data center utilizing bandwidth sharing and latencies is proposed
to enable scalable and fast simulations. While the network ow model is sufcient for most network
calculations, it is less accurate compared to the packet-level model. NetworkCloudSim implements
network ow model design with low computational overhead and good approximation to rea ...