The routing and wavelength assignment optimization problem in multi-domain WSON is researched. An inter-domain routing optimization algorithm based on improved ant colony algorithm is proposed. The proposed algorithm can achieve the routing optimization under multi-constraint condition, and can acquire the working and backup paths at one time for network survivability as well.Simulation experiments indicate that the algorithm can reduce the congestion degree of the networks and enhance the blocking performance of routing calculation for traffic requests when the interdomain path protection is required.

Binary translation system, a technique for translating executable binary program, could transform the code operating on a system structure into the command of another system structure. However, in multi-source translation system, the efficiency in floating point instruction translation realized by relying on software is not high. The floating point computation capacity is the important indicator of computer performance. By taking SW processor as the target platform, translation algorithm for floating point optimization based on QEMU translation system is put forward. It mainly includes the following two stages: firstly, the content of identifying floating point computation invoking helper function, the number obtaining parameter and returned value, data type information; secondly, the floating point operation of changing into local floating point operation and reduce the redundant floating points according to the standard of IEEE. According to the experiment of NPB test set, it manifests that the average speed-up ratio of floating point optimization algorithm can reach 30%.