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DiRong1.0: a distributed implementation for improving routing network generation in model coupling
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DOI：10.5194/gmd-13-6253-2020.png)
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Abstract
En 中文
A fundamental functionality of model coupling in an Earth system model is to efficiently handle data transfer between component models. An approach of M x N communication following a routing network has been used widely used for data transfer, and routing network generation becomes a major step required to initialize data transfer functionality. Some existing coupling software such as the Model Coupling Toolkit (MCT) and the existing versions of the Community Coupler (C-Coupler) employ a global implementation of routing network generation that relies on gather-broadcast communications, which can be very inefficient under a case of a large number of processes. This is an important reason why the initialization cost of a coupler increases with the number of processor cores. In this paper, we propose a distributed implementation for routing network generation, version 1.0 (DiRong1.0), which does not introduce any gather-broadcast communication. Empirical evaluations show that DiRong1.0 is much more efficient than the global implementation. DiRong1.0 has already been implemented in C-Couplers, and we believe that some other couplers can also benefit from it.
Keywords:
COMMUNITY COUPLER
SYSTEM
COMMUNICATION
PERFORMANCE
PREDICTION
SOFTWARE
Journal
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