A computing device is provided and includes a memory module, a sweep engine, a root snapshot module, and a trace engine. The blade server management system of the present invention has high system reliability and stability as well as a simple routing design while reducing the complexity of system design. When a load of the power supply is switched in a very short time, a power coupled to the compensation circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased. The image is then reprocessed using a spatiotemporal filter to correlate with the frequency components of the eddy current flaw signal to separate signals associated with cracks and other flaws at edges that would ordinarily be hidden by edge effect signals. At this moment, a center-to-center pitch LC1 between the center of the first coil 1a and that of the second coil 1b in the axis direction differs from a pole-to-pole pitch LM1 of the mover.