【摘要】 针对并行CPML存在的计算冗余和访问冗余问题,提出了一种用于时域有限差分法的图形处理器加速无除法联合最小访存CPML更新方案.该方案通过重新安排CPML迭代公式,将除法操作吸收进公式的固定系数中,消去了图形处理器计算中负担繁重的除法操作.该方案进一步通过合并PML区域内时域有限差分法常规场值更新步骤和CPML更新步骤,剔除了这两个步骤中的重复访存,使算法的访存需求最小化.数值验证结果表明,在同等精度下,CPML更新过程和PML区域场值整体计算过程分别减少了70%和44%的计算时间.更多还原

【Abstract】 To overcome computational redundancy and memory-access redundancy of the traditional GPUaccelerated CPML technique,a novel division-free and minimum-access CPML scheme is proposed.In the proposed scheme,the division operators in the CPML method are merged into a series of fixed coefficients by optimally rearranging the iteration process of CPML and then,the reduplicate memory accesses are eliminated by updating the FDTD and CPML operation in the PML region jointly.Experimental results show that the proposed structure can save up to 70% operation time compared with the traditional GPUCPML technique and 44% of field updating in the PML region,without any loss of accuracy.更多还原