ProActive components and legacy code

Matthieu MOREL

Objective : a framework for Grid components

Facilitating the design and implementation of complex distributed systems

Leveraging the ProActive libraryProActive components benefit from underlying features

Allowing reuse of legacy components (e.g. MPI)

Providing tools for defining, assembling and monitoring distributed components

Overview

Component-based programmingFractal component modelTowards Grid componentsOn-going and future works

Overview

Component-based programmingFractal component modelTowards Grid componentsOn-going and future works

A CORBA Component

MyBusinessComponent

Component interface

Facets

Eventsources

Eventsinks

Attributes

Receptacles

OF

FE

RE

DR

EQ

UIR

ED

Component based programming

Component = software unit, deployment unit

Industrial acceptance : EJBs, CCM, COM …

3 key concepts : 1. Encapsulation

Black boxes, offered and required services, configuration 2. Composition

Design of complex systems Hierarchical organization into sub-systems

3. Description ADL Logical and geographical composition Tools

REUSABILITYCUSTOMIZATION

COMPLEXITY HANDLING

HIGH ABSTRACTION LEVEL

Overview

Component-based programmingFractal component modelFeatures for Grid computingOn-going and future works

Fractal component model

Defined by Bruneton, Coupaye, Stefani, INRIA & FTKey features :

Lightweight and extensible Recursive Dynamic

Reference implementation : Julia (FT)New implementation based on active objectsStandard tools in the community (ADL, GUI)

Content

Cell analogy

CONTROLLER

CONTENT

Content

Interface = access point

Content

Hierarchical model

Content

Binding = interaction

Content

Binding = interaction

SUPER BINDING LIFE CYCLE CONTENT

Content

Controllers : non-functional properties

Overview

Component-based programmingFractal component modelTowards Grid componentsOn-going and future works

An activity, a process, …potentially in its own JVM

Primitive

Composite: Hierarchical, and

Distributed over machines

Parallel: Composite

+ Multicast (group)

Components for the GRID

Distributed Components

1 component can be distributed over several hosts

Components vs. Activities and JVMs

Activity JVM Component

Components orthogonal

to activities and JVMs :

contain activities,

span across several JVMs

A way to globally manipulate

distributed and running activities

Group proxyGroup proxy

Multicaston client interface

Multicast on inner server interface

Groups in components

Migration capabilities of composites

Migrate sets of components, including composites

Migration capabilities of composites

Migrate sets of components, including composites

Co-allocation, re-distribution

e.g. upon communication intensive phase

Co-allocation, re-distribution

e.g. upon communication intensive phase

Co-allocation, re-distribution

e.g. upon communication intensive phase

At runtime or design time (ADL)

getA()

getB()

getAandB()

First Class Futures

1 : Synchronous method calls

getA()

getB()

getAandB()

getB()

getA()getAandB()

getA()

getB()

getAandB() getA()

getB()

getAandB()

getB()

getA()getAandB()

First Class Futures

2 : Asynchronous method calls, full-fledge wait-by-necessity

Non-blocking method calls

value of A

value of B

Process flow is not blocked by asynchronous computations

Overview

Component-based programmingFractal component modelTowards Grid componentsOn-going and future works

On-going work : optimizations

Dynamic shortcuts for distributed bindings

(through tensioning)

1 remote call

On-going work : GUI

Perspective : legacy code wrappers

MPI Code (C/Fortran)method calls

messages on tags

messages on tags

method calls

Perspective : MxN communications

M components

N components

GATHERING

SCATTERING

REDISTRIBUTION from M to N

Conclusion

Conclusion : ProActive Components

Encapsulation : Formed from one (or several) Active Object Executing on one or several JVMs Server ports: Java Interfaces Client ports: Java Attributes

Composition : Composite components : hierarchical Point-to-point or Group communication between components Parallel component : multicast of calls in composites,

redistribution

Description : XML definition of primitive and composite (ADL) Virtual nodes capture the deployment capacities and needs

Merci!

Questions?

Contact : Matthieu Morel