Abstract: A processor in a multi-node system includes a detecting module which obtains temperatures of all nodes periodically. A comparing module compares all obtained temperatures to obtain a greatest temperature. A determining module determines a fan speed value corresponding to the greatest temperature according to a predetermined table which records relationships of temperatures and fan speed values. A control module controls all fans to work at the fan speed value corresponding to the greatest temperature.

Abstract: A processor used in a multi-node system includes a detecting module, to obtain voltage and current information of all nodes in the multi-node system periodically. A calculating module calculates energy being consumed by each node of all the nodes according to the obtained voltage and current information. A determining module determines a node which needs to be reduced according to the energy calculation. A control module turns on a switch which is connected with the node whose energy needs to be reduced, thereby powering off the node whose energy needs to be reduced.

Abstract: In a method for viewing relevant circuits of a signal on a circuit design diagram of a printed circuit board (PCB), a circuit design diagram and a circuit testing program of the PCB are read from a storage system. A state of each signal of the PCB on the circuit design diagram is determined. Accordingly, sub circuit design diagrams of the signal are obtained from the circuit design diagram and stored into the storage device. When a testing instruction is selected from the circuit testing program, a signal of the PCB is determined. Sub circuit design diagrams of the determined signal are retrieved from the storage device and displayed on a display device.

Abstract: In a method for switching a work mode of an electronic device, if the electronic device receives a trigger signal when the electronic device is starting up, the electronic device enters the diagnostic mode. Otherwise, if the electronic device does not receive the trigger signal when the electronic device is starting up, the electronic device enters a production mode. When the electronic device receives the trigger signal in the production mode, operation parameters of the electronic device are stored into a storage system, and the electronic device switches from the production mode to the diagnostic mode. When the electronic device receives an exit command in the diagnostic mode, the electronic device switches from the diagnostic mode to the production mode.