基于GPU的生态环境遥感评价模型并行化研究  

Parallelization on Model of Ecological Environment Remote Sensing Evaluation Based on GPU

作　　者：李林[1] 顾进锋[1] 宋安捷 郑海宁[1] 曹津[1] 朱德海[1] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]谢菲尔德大学计算机学院

出　　处：《农业机械学报》2017年第5期135-141,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(31471762)

摘　　要：通过基于GPU的生态环境遥感评价模型并行化研究,在深入分析CPU+GPU异构通用计算平台数据传输瓶颈的基础上,设计了数据分片、异步传输的GPU图像处理框架。在此基础上,将碳固定量、草地退化指数和生态环境指数3个计算模型基于CUDA进行并行化实现,并通过实验验证了该技术方法的有效性,随着数据规模的变大,碳固定量计算模型的加速比达到了8.04倍,草地退化指数计算模型的加速比达到了12.21倍,生态环境指数计算模型的加速比达到了7.45倍。In order to solve the problem of the model＇ s slowly processing speed of ecological environment remote sensing evaluation currently, a framework about GPU image processing was designed with data partitioning and scheduling asynchronous transmission which was based on the in-depth analysis about the data transmission bottleneck of heterogeneous CPU ＋ GPU general computing platform. It included the carbon fixed quantity and grassland degradation index, whose intrinsic parallelism met the GPU computing features. For the above models, it was put forward based on CUDA parallel implementation. The core link of indexes for evaluation of ecological environment of remote sensing data standardization and weighted fusion of CUDA parallel module were implemented. Finally, the effectiveness of technical methods was verified through experiments, as the scale of data became larger, the parallel execution speed of three business models became faster, the speedup ratio of the fixed amount of carbon achieved a 8.04 times execution rate lift; the speedup ratio of the index of grassland degradation achieved a 12.21 times execution rate lift; and the speedup ratio of the index of ecological environment achieved a 7.45 times execution rate lift. At the same time, the speedup ratio was decreased as the number of input data files increased, equipment between I/O was still the main factor which restricted the running efficiency of the algorithm.

关 键 词：生态环境评价 遥感 并行化处理 GPU CUDA 

分 类 号：S2[农业科学—农业工程]