A NOVEL PARALLEL METHOD FOR SPECKLE MASKING RECONSTRUCTION USING THE OPENMP

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of the Korean Astronomical Society Pub Date : 2016-08-31 DOI:10.5303/JKAS.2016.49.4.157

Xuebao Li, Yan-fang Zheng

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引用次数: 1

Abstract

High resolution reconstruction technology is developed to help enhance the spatial resolution of observational images for ground-based solar telescopes, such as speckle masking. Near real-time reconstruction performance is achieved on a high performance cluster using the Message Passing Interface(MPI). However, much time is spent in reconstructing solar subimages in such a speckle reconstruction. We design and implement a novel parallel method for speckle masking reconstruction of solar subimage on a shared memory machine using the OpenMP. Real tests are performed to verify the correctness of our codes. We present the details of several parallel reconstruction steps. The parallel implementation between various modules shows a great speed increase as compared to single thread serial implementation, and a speedup of about 2.5 is achieved in one subimage reconstruction. The timing result for reconstructing one subimage with 256×256 pixels shows a clear advantage with greater number of threads. This novel parallel method can be valuable in real-time reconstruction of solar images, especially after porting to a high performance cluster.

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一种基于openmp的并行散斑遮蔽重建方法

为了提高地面太阳望远镜观测图像的空间分辨率，开发了高分辨率重建技术，如散斑掩蔽。使用消息传递接口(Message Passing Interface, MPI)可以在高性能集群上实现接近实时的重构性能。然而，在这种散斑重建中，重建太阳子图像花费了大量的时间。本文设计并实现了一种基于OpenMP的太阳子图像散斑遮蔽重建并行方法。进行了实际测试以验证代码的正确性。我们提出了几个平行重建步骤的细节。与单线程串行实现相比，各个模块之间的并行实现速度有很大提高，在一个子图像重建中速度提高了2.5左右。使用256×256像素重建一个子图像的计时结果在线程数量较多的情况下显示出明显的优势。这种新的并行方法在太阳图像的实时重建中具有重要的应用价值，特别是在移植到高性能集群之后。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Korean Astronomical Society 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.