Optical interconnects for short-distance transmission are becoming more and more important along with the increasing demand on large-scale computing tasks. An analytic method to evaluate the computing performance of optical and electrical chip-to-chip interconnect systems from the parallel computing performance view is proposed. The mesh architecture model and hypercube architecture model are both investigated. The speedup and efficiency are selected to represent the parallel computing performance of an interconnect system. The relation between speedup and computing number,together with the relation between efficiency and computing number,are summarized and analyzed. The comparison shows that the parallel system based on optical chip-to-chip interconnects system has much higher speedup and efficiency than that based on electrical system.