A Service Oriented HLA RTI on the Grid

Abstract

Modeling and simulation permeate all areas of business, science and engineering. To promote the interoperability and reusability of simulation applications and link geographically dispersed simulation components, distributed simulation was introduced. While the High Level Architecture (HLA) is the IEEE standard for distributed simulation, a Run Time Infrastructure (RTI) provides the actual implementation of the HLA. With increased size and complexity of simulation applications, large amounts of distributed computational and data resources are required. The Grid provides a flexible, secure and coordinated resource sharing environment which can facilitate distributed simulation execution. In this paper, we propose a Service Oriented HLA RTI (SOHR) framework which provides the functionalities of an RTI as Grid services and enables large scale distributed simulations to be conducted on a heterogeneous Grid environment. The various services in SOHR can be dynamically deployed, discovered and undeployed, leading to a scalable distributed simulation environment. While the communications between simulators are through Grid service invocations, the standard HLA interface is provided as a library to increase simulator reusability and interoperability. A subset of HLA specifications was implemented in a SOHR prototype based on GT4 and the experimental results have verified the feasibility of SOHR.

An Aspect-Oriented Approach for Disaster Prevention Simulation Workflows on Supercomputers, Clusters, and Grids

“…However, HLA is often perceived as a "heavy" standard [26], that is, complex, and difficult to learn and adopt. Moreover, despite much work put into improving HLA functionality for large-scale distributed environments, especially grids [27], there are still many challenges to be addressed [28]. In contrast to HLA, we addressed the issue of reusability within a single organization where non standard interfaces are used to couple the components of a single simulation application.…”

Dynamic Interactions in HLA Component Model for Multiscale Simulations

“…All federates within a federation are connected together using a tuple space, which they can use for subscribing and publishing events and data objects. The tuple space takes care of sending the appropriate data from the publisher to the subscriber (in most HLA implementations objects and interactions to be exchanged have to be specified before federation creation, but there exists an HLA implementation based on Grid Services [16] which does not have this limitation). HLA also includes advanced time management mechanisms that allows to connect federates with different internal time management.…”

An Efficient Time Management Scheme for Large-Scale Distributed Simulation Based on JXTA Peer-to-Peer Network

“…Indeed, many of the recent distributed simulation tools use network middleware to bridge the single processor's simulators for message passing in a distributed network environment. For instance, [15] implemented HLA's key functionalities as Grid service, thus, provided a distributed simulation framework based on invocations of Grid services. Other tools, such as DEVS/SOA, DCD++ [16], used the same strategy to wrap their existing single processor's simulators as standard web services to form a integrated distributed simulation environment with the Internet as backbone.…”