二维浅水波并行模式的伴随

Adjoint Model of 2-D Parallel Shallow Water Model

以二维浅水波为例,详细探讨如何开发并行模式的切线性模式和伴随模式。切线性模式的并行机制和原始模式一致,而伴随模式不同。三个模式采用一致的数据剖分方法可提高并行效率。在集群并行计算机系统上采用一维数据剖分,切线性模式的通信量与原始模式相当,而计算量几乎是原始模式的2倍;伴随模式的通信量大约是原始模式的2倍,而计算量几乎是原始模式的3倍。在三个模式中,切线性模式的加速比最大。

This paper discusses how to develop adjoint model(ADM) and tangent linear model(TLM) of the parallel model based on shallow water equation.The parallel strategy of TLM is the same as the original parallel model.Parallel strategy of ADM is different.The three adopt uniform domain decomposition in order to improve the parallel efficiency.One domain decomposition is adopted on cluster parallel computer system.The computing cost of TLM is about as double as the original model and ADM's is about 3 times as that.The communication cost of ADM is about as double as the original parallel model.The speedup of TLM is the best among three models.