Advection-Based Sparse Data Management for Visualizing Unsteady Flow

Advection-Based Sparse Data Management for Visualizing Unsteady Flow
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基于平流的稀疏数据管理,用于可视化不稳定流

DOI:
10.1109/tvcg.2014.2346418
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发表时间:
2014-12
影响因子:
5.2
通讯作者:
Pan Jingshan
Pan Jingshan
中科院分区:
计算机科学1区
文献类型:
--
作者:
Guo Hanqi;Zhang Jiang;Liu Richen;Liu Lu;Yuan Xiaoru;Huang Jian;Meng Xiangfei;Pan Jingshan

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在计算大规模非定常流场的积分曲线和积分曲面时,一个主要的瓶颈是数据访问需求和可用带宽(I/O和内存)之间的差距越来越大。在这项工作中,我们探索了一种新的基于对流的方案来管理流场数据,以提高效率和可扩展性。关键是首先将流场划分成小块(例如,单元或非常细粒度的单元块),然后(预先)使用并行键值存储按需获取和管理小块。其好处是(1)大大增加了本地范围分析(例如,源-目的地查询、条纹表面生成)的规模,可以适应任何给定的硬件资源限制;(2)提高了内存和I/O带宽效率以及朴素任务-并行粒子平流的可扩展性。我们使用一个原型系统演示了我们的方法,该原型系统既可以在工作站上工作,也可以在超级计算环境中工作。结果表明,与访问原始流数据相比,大大降低了I/O开销,并且在超级计算机上针对各种应用程序具有很高的可扩展性。
When computing integral curves and integral surfaces for large-scale unsteady flow fields, a major bottleneck is the widening gap between data access demands and the available bandwidth (both I/O and in-memory). In this work, we explore a novel advection-based scheme to manage flow field data for both efficiency and scalability. The key is to first partition flow field into blocklets (e.g. cells or very fine-grained blocks of cells), and then (pre)fetch and manage blocklets on-demand using a parallel key-value store. The benefits are (1) greatly increasing the scale of local-range analysis (e.g. source-destination queries, streak surface generation) that can fit within any given limit of hardware resources; (2) improving memory and I/O bandwidth-efficiencies as well as the scalability of naive task-parallel particle advection. We demonstrate our method using a prototype system that works on workstation and also in supercomputing environments. Results show significantly reduced I/O overhead compared to accessing raw flow data, and also high scalability on a supercomputer for a variety of applications.
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