Data Distribution for Parallel CORBA Objects

IFIP Advances in Information and Communication Technology

Alléon³

2001

Self Cite

This paper describes an approach for scientific code coupling using CORBA objects. Our approach is based on an extension of CORBA, called PaCO (Parallel CORBA Object), to support efficiently the encapsulation of parallel codes into distributed objects. With such extension, a parallel code can be seen as a collection of identical CORBA objects. Our extension to CORBA modifies only the Interface Definition Language (IDL) syntax by adding new language constructs. These new keywords allow the specification of several aspects associated with a collection of objects. We developed a new IDL compiler that generates stubs and skeletons to manage collections of objects transparently to the users. Parallel CORBA objects have been used within an industrial application from Aerospatiale Matra in the field of Electromagnetic simulation. The paper gives some performance results.

Section: Methodsmentioning

confidence: 99%

Section: Stub and Skeleton Code Generationmentioning

confidence: 99%

Code Coupling Using Parallel Corba Objects

René

IFIP Advances in Information and Communication Technology

Alléon³

2001

Self Cite

“…Such asynchronous invocation mechanism is based on the returning of future [11] for out arguments. PACO PACO [12,13,14], whose model is shown in Figure 3, is another early attempt for parallel programming in CORBA. To implement the concept of parallel CORBA object as defined hereinbefore, Figure 4: Data Parallel Object.…”

Section: Pardismentioning

confidence: 99%

PACO++: a parallel object model for high performance distributed systems

Pérez

37th Annual Hawaii International Conference on System Sciences, 2004. Proceedings of The

Ribes

2004

With the availability of high bandwidth wide area networks, it is nowadays feasible to couple several computing resources-supercomputers or PC clusters-together to obtain a high performance distributed system. The question is to determine a suitable programming model that provides transparency, interoperability, reliability, scalability and performance. Since such distributed systems appear as a combination of distributed and parallel systems, it is very tempting to extend programming models that were associated to distributed or to parallel systems. Another choice is to combine the two different worlds into a single coherent one. A parallelism oriented model appears more adequate to program parallel codes while a distributed oriented model is more suitable to handle inter-code communications. We have designed the concept of parallel CORBA object to address this issue. It extends the CORBA specification with the notion of parallel object. A parallel CORBA object is a collection of CORBA object with a Single Program Multiple Data (SPMD) execution model. This paper deals with PACO++, a portable implementation of the concept of parallel CORBA object. It examines how the different design issues have been tackled with. For example, scalability is achieved between two parallel CORBA objects by involving all members of both collections in the communication. Early experiments with a 1 Gbit/s WAN show scalable performance: an aggregated bandwidth of 874 Mbit/s has been obtained between two parallel CORBA objects made of twelve nodes each. Such a performance has been obtained while preserving the semantics of CORBA. For example, parallel CORBA objects are interoperable with standard CORBA objects via a proxy mechanism. Only the implementer of a parallel CORBA object and parallel-aware clients have to deal with parallel issues. PACO++ is currently used as the high performance object platform for several multiphysics applications like hydrology and aircraft simulations.

“…The parallel CORBA object concept (PaCO) 19,20,21] is another attempt for parallel programming in CORBA. A parallel CORBA object is a collection of identical standard CORBA objects as shown in Figure 6.…”

Section: Paco: Parallel Corba Objectmentioning

confidence: 99%

Achieving portable and efficient parallel CORBA objects

Denis

Pérez

Concurrency and Computation

2003

Self Cite

SUMMARYWith the availability of Computational Grids, new kinds of applications are emerging. They raise the problem of how to program them on such computing systems. In this paper, we advocate a programming model based on a combination of parallel and distributed programming models. Compared to previous approaches, this work aims at bringing SPMD programming into CORBA in a portable way. For example, we want to interconnect two parallel codes by CORBA without modifying either CORBA or the parallel communication API. We show that such an approach does not entail any loss of performance compared to previous approaches that required modi cation to the CORBA standard. Moreover, using an ORB that is able to exploit high performance networks, we show that portable parallel CORBA objects can e ciently make use of such networks.