Programming FPGAs Using OpenCL from Performance Model to Application Study

Recent adoption of OpenCL programming model by FPGA vendors has realized the function portability of OpenCL workloads on FPGA. However, the poor performance portability prevents its wide adoption. To harness the power of FPGAs using OpenCL programming model, it is advantageous to design an analytical performance model to estimate the performance of OpenCL workloads on FPGAs and provide insights into the performance bottlenecks of OpenCL model on FPGA architecture. In the first part of the talk, we present FlexCL, an analytical performance model for OpenCL workloads on flexible FPGAs. FlexCL estimates the overall performance by tightly coupling the on chip global memory and on-chip computation models based on the communication mode. Then, we present an application study of mapping stencil applications onto FPGAs using OpenCL programming model.