hpc workflows consist of multiple phases and components executed collaboratively to reach the same goal. They perform necessary computations and exchange data, often through system-wide POSIX-compliant parallel file s...
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ISBN:
(纸本)9798350383461;9798350383454
hpc workflows consist of multiple phases and components executed collaboratively to reach the same goal. They perform necessary computations and exchange data, often through system-wide POSIX-compliant parallel file systems. However, POSIX file systems pose challenges in performance and scalability, prompting the development of alternative storage systems like object stores. Despite their potential, object stores face adoption barriers in hpc workflows due to their lack of workflow awareness and the structured nature of hpc data. This work presents a case study using the Proactive Data Containers (PDC), a framework focusing on object-centric runtime data management, to support a real-world astronomy workflow that runs on hpc systems, called Montage. Due to its user-space deployment feature, PDC is flexible to be adopted transparently with existing I/O libraries. This study explores the use of PDC with Montage's existing FITS-based I/O methods and discusses workflow-oriented optimizations such as caching, prefetching, and write aggregation, and provides insights and lessons learned throughout the porting process.
Criminal justice involved (CJI) individuals with a history of opioid use disorder (OUD) are at high risk of overdose and death in the weeks following release from jail. We developed the Justice-Community Circulation M...
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ISBN:
(纸本)9781665435772
Criminal justice involved (CJI) individuals with a history of opioid use disorder (OUD) are at high risk of overdose and death in the weeks following release from jail. We developed the Justice-Community Circulation Model (JCCM) to investigate OUD-CJI dynamics post-release and the effects of interventions on overdose deaths. The JCCM uses a synthetic agent-based model population of approximately 150,000 unique individuals that is generated using demographic information collected from multiple Chicago-area studies and data sets. We use a high-performance computing (hpc) workflow to implement a sequential approximate Bayesian computation algorithm for calibrating the JCCM. The calibration results in the simulated joint posterior distribution of the JCCM input parameters. The calibrated model is used to investigate the effects of a naloxone intervention for a mass jail release. The simulation results show the degree to which a targeted intervention focusing on recently released jail inmates can help reduce the risk of death from opioid overdose.
The traditional workflow in a high performance computing (hpc) simulation is to prepare the application's input, run the simulation, and visualize the simulation results in a post-processing step. By performing th...
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ISBN:
(纸本)9781510801011
The traditional workflow in a high performance computing (hpc) simulation is to prepare the application's input, run the simulation, and visualize the simulation results in a post-processing step. By performing these steps simultaneously, significant development and testing time can be saved. Computational steering provides the capability to direct or re-direct the progress of an hpc application at run-time by modifying application-defined control parameters using a steering client application. In this paper, we discuss a computational steering framework for the Blue Gene/Q system that provides an innovative solution and an easy-to-use platform, which allows user(s) to connect to and interact with running application(s) in real-time from native desktop steering applications and/or mobile devices. This framework uses RealityGrid as the underlying steering library and adds several enhancements to the library to enable steering support for the Blue Gene systems. The Blue Gene supercomputer presents special challenges for remote access because the compute nodes reside on private networks. This paper discusses an implemented solution for remote steering of simulation applications running on a high performance computer system and describes the implementation challenges.
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