A computer-implemented method of computing throughput of a data-routing scheme for a network of nodes interconnected by links and having at least one ingress point and at least one egress point. The diagnosis system includes a diagnosis device which includes an RFID tag, stores a diagnosis instruction into the RFID tag, and receives a diagnosis result, an RFID tag is attached to the image forming apparatus. A bottom of the enclosure has a relatively low reflectivity interior surface. The bottom of the alarm works together with a light-touch switch, and the top of the alarm is an operation end. When conditions change, either the first virtual machine or the second virtual machine can request a renegotiation of the agreement to use computer resources. A sample flow from the main flow exits the sample outlet.