Aci grid asp client-Server Approach for Simulation over the grid frédéric Desprez

ACI GRID ASP Client-Server Approach for Simulation over the GRID

• Frédéric Desprez

• LIP ENS Lyon

• ReMaP Project

Grid RPC and ASP concepts

• Grid RPC and ASP concepts

• ACI Grid ASP

• Target applications

• DIET

• History
• An ASP platform

Grid RPC and ASP concepts

• Grid RPC and ASP concepts

• ACI Grid ASP

• Target applications

• DIET

• History
• An ASP platform

Grid RPC and ASP concepts

• Grid RPC and ASP concepts

• ACI Grid ASP

• Target applications

• DIET

• History
• An ASP platform

Project Overview

• Multi-disciplinary project

• Rent computational power and memory capacity over the net

• Four applications with different needs and different behavior

• Develop a toolbox for the deployment of application servers

• Study the impact of these applications on our environment and adapt it to these new needs

• A highly hierarchical and heterogeneous network (VTHD + networks of the labs involved in the project)

• A software architecture developed in an RNTL project (GASP)

ASP Partners

• ReMaP – LIP ENS Lyon F. Desprez, E. Caron, P. Combes, M. Quinson, F. Suter, Ing. X, Y

• ARES – INSA Lyon E. Fleury

• Résédas – LORIA Y. Caniou, E. Jeannot

• SDRP – LIFC J.-M. Nicod, L. Philippe, S. Contassot, F. Lombard

• Physique Lyon 1, Physique ENS Lyon, MAPLI J.-L. Barrat, V. Volpert

• LST – ENS Lyon G. Vidal

• SRMSC Nancy G. Monard

• IRCOM R. Quéré, R. Sommet

Grid RPC and ASP concepts

• Grid RPC and ASP concepts

• ACI Grid ASP

• Target applications

• DIET

• History
• An ASP platform

Target Applications

• Researchers of four different fields (chemistry, physics, electronics, geology)

• Four applications with different needs and different behavior

Applications in ASP Mode

• Study the target applications

• Validate the parallel versions on server

• Develop client and server « glues » and adapt DIET

• Validate the prototype with non-specialist users

• Adapt DIET if necessary

Digital Elevation Models (MNT)

• Stereoscopic processing:

• Maximal matching between the spots of both pictures.
• Elevation computation.

Digital Elevation Models (MNT), cont.

• Specific needs:

• Great amount of memory
• Great amount of data
• Visualization

• ASP approach:

• Computational power:
• Processing high-definition pictures
• Ex : Pictures from SPOT Satellite < 5m
• Reducing processing time
• Ex : Earthquake.

Molecular Dynamics

• Simulation of atomic trajectories from molecular interactions

• - Hydrodynamics (velocity fields, temperature, etc.)
• - Mechanical properties for solids at a micro scale:

• Short range interactions:

• - Partitioning  Good parallelism.

• Differential equation solving:

• Logs dumped on disk and exploited postmortem

• Private and public codes

Molecular Dynamics, cont.

• Specific needs:

• High accuracy
• Large systems
• Disk logs

• ASP approach:

• Computational power
• Checkpointing mechanisms on the grid

Potential Energy HyperSurface (HSEP)

HSEP, cont.

HSEP, cont.

• Specific needs:

• Use of a Relational DB (MySQL) storing all computation done and to be done
• A Web Interface (http+PHP) links the client to the RDB and DIET
• Results filtering through Python scripts
• Complexity: O(N4)

• ASP approach:

• DB as a DIET client
• Security
• Coarse grain parallelism

Microwave Circuits Simulation, cont.

• Large systems to solve

• Clients look fast and efficient sparse solvers

• Simulators source code may be confidential

• Dedicated servers for physical simulation, reachable through DIET which provides the part of the jacobian matrix in order to build the large system to solve

Grid RPC and ASP concepts

• Grid RPC and ASP concepts

• ACI Grid ASP

• Target applications

• DIET

• History
• An ASP platform

Hierarchical architecture for scalability

• Hierarchical architecture for scalability

• Distributing information in the entire tree

• plug-in schedulers

• Data persistence