Accelerating the scheduling of the network resources of the next-generation optical data centers

Data centers (DCs) play a key role in the evolving IT applications and they rely heavily on the optical interconnects to improve their performance and scalability. Optically switched DCs most often exploit the slotted Time Division Multiplexing Access (TDMA) operation and the Wavelength Division Multiplexing (WDM) technology and rely on the effective scheduling of the TDMA frames to decide in real time the end-to-end connections that include the network links, switches and ports. This task becomes computationally intensive as the communication requests increase.The current paper builds on a greedy scheduling algorithm to introduce a parallel technique that accelerates the scheduling process and improves optical DC's performance. The proposed technique handles efficiently the scheduler's data structures, minimizes the communication among the scheduler's processors and it is scalable. Moreover, this work presents the technique's performance results for a variety of scheduling scenarios and DC sizes executed on an algorithm-specific Single Instruction Multiple Data (SIMD) accelerator architecture and on a Graphics Processing Unit (GPU). The performance of the GPU and the SIMD accelerator implemented on FPGA validate the parallel scheduler technique.