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Title: National Computational Infrastructure for LatticeGauge Theory SciDAC-2 Closeout Report

As part of the reliability project work, researchers from Vanderbilt University, Fermi National Laboratory and Illinois Institute of technology developed a real-time cluster fault-tolerant cluster monitoring framework. The goal for the scientific workflow project is to investigate and develop domain-specific workflow tools for LQCD to help effectively orchestrate, in parallel, computational campaigns consisting of many loosely-coupled batch processing jobs. Major requirements for an LQCD workflow system include: a system to manage input metadata, e.g. physics parameters such as masses, a system to manage and permit the reuse of templates describing workflows, a system to capture data provenance information, a systems to manage produced data, a means of monitoring workflow progress and status, a means of resuming or extending a stopped workflow, fault tolerance features to enhance the reliability of running workflows. In summary, these achievements are reported: • Implemented a software system to manage parameters. This includes a parameter set language based on a superset of the JSON data-interchange format, parsers in multiple languages (C++, Python, Ruby), and a web-based interface tool. It also includes a templating system that can produce input text for LQCD applications like MILC. • Implemented a monitoring sensor framework in software that is in productionmore » on the Fermilab USQCD facility. This includes equipment health, process accounting, MPI/QMP process tracking, and batch system (Torque) job monitoring. All sensor data are available from databases, and various query tools can be used to extract common data patterns and perform ad hoc searches. Common batch system queries such as job status are available in command line tools and are used in actual workflow-based production by a subset of Fermilab users. • Developed a formal state machine model for scientific workflow and reliability systems. This includes the use of Vanderbilt’s Generic Modeling Envirnment (GME) tool for code generation for the production of user APIs, code stubs, testing harnesses, and model correctness verification. It is used for creating wrappers around LQCD applications so that they can be integrated into existing workflow systems such as Kepler. • Implemented a database system for tracking the state of nodes and jobs managed by the Torque batch systems used at Fermilab. This robust system and various canned queuries are used for many tasks, including monitoring the health of the clusters, managing allocated projects, producing accounting reports, and troubleshooting nodes and jobs.« less
Publication Date:
OSTI Identifier:
Report Number(s):
DOE F 241.3
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
Vanderbilt University
Sponsoring Org:
Contributing Orgs:
UniversityofArizona; UniversityofUtah; l UniversityofWashington; DePaulUniversity; IllinoisInstituteofTechnology; UniversityofNorthCarolina
Country of Publication:
United States