To reduce OPC simulation time, we attempt to apply graphic processing unit (GPU) to MBOPC because OPC process is good to be programmed in parallel. We address some issues that may typically happen during GPU-based OPC simulation in multi thread system, such as “out of memory” and “GPU idle time”. To overcome these problems, we propose a thread scheduling method, which manages OPC jobs in multiple threads in such a way that simulations jobs from multiple threads are alternatively executed on GPU while correction jobs are executed at the same time in each CPU cores. It was observed that the amount of GPU peak memory usage decreases by up to 35%, and MBOPC runtime also decreases by 4%. In cases where out of memory issues occur in a multi-threaded environment, the thread scheduler was used to improve MBOPC runtime up to 23%.
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Heejun Lee, Sangwook Kim, Jisuk Hong, Sooryong Lee, Hwansoo Han, "Thread scheduling for GPU-based OPC simulation on multi-thread," Proc. SPIE 10587, Optical Microlithography XXXI, 105870P (20 March 2018);