High Performance Parallel Image Reconstruction for New Vacuum Solar Telescope

TL;DR

This paper presents a parallelized image reconstruction program for the New Vacuum Solar Telescope, achieving 71-fold speedup and enabling real-time processing of solar observational data using MPI-based C code on high-performance clusters.

Contribution

The paper introduces a parallel implementation of speckle masking reconstruction for NVST, significantly accelerating processing and enabling real-time applications.

Findings

Data processing speed increased by 71 times

Parallel implementation scales well on multi-processor systems

Potential bottlenecks identified for further optimization

Abstract

Many technologies have been developed to help improve spatial resolution of observational images for ground-based solar telescopes, such as adaptive optics (AO) systems and post-processing reconstruction. As any AO system correction is only partial, it is indispensable to use post-processing reconstruction techniques. In the New Vacuum Solar Telescope (NVST), speckle masking method is used to achieve the diffraction limited resolution of the telescope. Although the method is very promising, the computation is quite intensive, and the amount of data is tremendous, requiring several months to reconstruct observational data of one day on a high-end computer. To accelerate image reconstruction, we parallelize the program package on a high performance cluster. We describe parallel implementation details for several reconstruction procedures. The code is written in C language using Message Passing Interface (MPI) and optimized for parallel processing in a multi-processor environment. We show the excellent performance of parallel implementation, and the whole data processing speed is about 71 times faster than before. Finally, we analyze the scalability of the code to find possible bottlenecks, and propose several ways to further improve the parallel performance. We conclude that the presented program is capable of executing in real-time reconstruction applications at NVST.