Engineering topics

Jamnagarwala, Arwa

Publications and source records attributed to Jamnagarwala, Arwa.

2 records

DOE OSTI2011

Kepler Scientific Workflow Design and Execution with Contexts

A context-aware scientific workflow is a typical scientific workflow that is enhanced with context binding and awareness mechanisms. Context facilitates further configuration of the scientific workflow at runtime such that it is tuned to its environment during execution and responds intelligently based on such awareness without customized coding of the workflow. In this paper, we present a context annotation framework, which supports rapid development of context-aware scientific workflows. Context annotation enables a diverse type of actor in Kepler that may bind with different sensed environmental information as part of the actor’s regular data. Context-aware actors simplify the construction of scientific workflows that require intricate knowledge in initializing and configuring a large number of parameters to cover all different execution conditions. This paper presents the motivation, system design, implementation, and usage of context annotation in relation to the Kepler scientific workflow system.

99 GENERAL AND MISCELLANEOUS↗

DOE OSTI2010

Context-Aware Scientific Workflow Systems using KEPLER

Data-intensive scientific workflows are often modeled using a dataflow-oriented model. The simplicity of a dataflow model facilitates intuitive workflow design, analysis, and optimization. However, some amount of control-flow modeling is often necessary for engineering fault-tolerant, robust, and adaptive workflows. Modeling the control-flow using inherent dataflow constructs will quickly end up with a workflow that is hard to comprehend, reuse, and maintain. In this paper, we propose a context-aware architecture for scientific workflows. By incorporating contexts within a data-flow oriented scientific workflow system, we enable the development of context-aware scientific workflows without the need to use numerous low-level control-flow actors. This results in a workflow that is aware of its environment during execution with minimal user input and responds intelligently based on such awareness at runtime. A further advantage of our approach is that the defined contexts can be reused and shared across other workflows. We demonstrate our approach with two prototype implementation of context-aware actors in KEPLER.

99 GENERAL AND MISCELLANEOUS↗