排序方式: 共有27条查询结果,搜索用时 0 毫秒
21.
22.
A strategy for raster-based geocomputation under different parallel computing platforms 总被引:1,自引:0,他引:1
Cheng-Zhi Qin Li-Jun Zhan A-Xing Zhu Cheng-Hu Zhou 《International journal of geographical information science》2014,28(11):2127-2144
The demand for parallel geocomputation based on raster data is constantly increasing with the increase of the volume of raster data for applications and the complexity of geocomputation processing. The difficulty of parallel programming and the poor portability of parallel programs between different parallel computing platforms greatly limit the development and application of parallel raster-based geocomputation algorithms. A strategy that hides the parallel details from the developer of raster-based geocomputation algorithms provides a promising way towards solving this problem. However, existing parallel raster-based libraries cannot solve the problem of the poor portability of parallel programs. This paper presents such a strategy to overcome the poor portability, along with a set of parallel raster-based geocomputation operators (PaRGO) designed and implemented under this strategy. The developed operators are compatible with three popular types of parallel computing platforms: graphics processing unit supported by compute unified device architecture, Beowulf cluster supported by message passing interface (MPI), and symmetrical multiprocessing cluster supported by MPI and open multiprocessing, which make the details of the parallel programming and the parallel hardware architecture transparent to users. By using PaRGO in a style similar to sequential program coding, geocomputation developers can quickly develop parallel raster-based geocomputation algorithms compatible with three popular parallel computing platforms. Practical applications in implementing two algorithms for digital terrain analysis show the effectiveness of PaRGO. 相似文献
23.
24.
针对利用超高阶地球重力场模型计算大范围、高分辨率区域垂线偏差效率低的问题,提出基于OpenMP多核并行技术的数组升维和分区计算方法。实验表明,该方法计算垂线偏差的加速比最高达到5.6倍,显著提高了超高阶垂线偏差的计算效率,也为解决重力场数据处理过程中类似的快速计算问题提供了思路。 相似文献
25.
OpenMP并行算法在卫星重力场模型反演中的应用 总被引:1,自引:0,他引:1
利用卫星重力数据反演地球重力场需要解决重力场模型的高效计算问题。分析了最小二乘直接法求解重力场模型涉及的密集型计算任务,基于OpenMP实现了卫星重力场模型直接求解的并行算法。利用30天、5秒采样间隔的沿轨扰动位T和径向扰动重力梯度Tr数据,分别反演了60阶次的卫星重力场模型,计算结果表明,OpenMP并行算法能够有效提高直接法求解卫星重力场模型的计算效率,并具有很好的稳定性。 相似文献
26.
??OpenMP??????????Intel Math Kernel Library10.2??????????????????????????????????????????Ч??????????????1?????????????????γ??????????????????OpenMP????????????洢???????????????????????С??2???????????????????????????????γ?????????MKL?????????????Ч?????3??MKL??????Ч???????OpenMP????4?????????OpenMP??MKL??????????????????????????????????Ч??? 相似文献
27.