Legion Introductory Tutorial


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Table of Contents

Legion Introductory Tutorial

Metasystems Background

The Opportunity

Our Vision - One Transparent System

Metasystem Benefits

Shared Persistent Spaces

Transparent Remote Execution

Parallel Processing

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Wide-area parallel processing


Meta-application example

Characteristics of Meta-applications


The Problem

Legion Philosophy

Legion philosophy

Architecture and Object Model

Legion is object-based

The object model

Legion Object Identifiers (LOIDs)

Dotted-hex notation

Access Control

Host objects



Class Objects

For example...

Binary Management

Users View

First steps

Authentication (login)

Legion (context) space

Contexts are more general than Unix directories

Context Examples

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Access Control

Access Control

Unified Console

TTY Objects in Action

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Running sequential applications

Registering the binary

Remote execution

Example 1

Example 2

Parameter space studies


Example 1

Example 2

Legion-aware sequential applications

Legion I/O

C interface example

Fortran Interface

Linkage requirements

Parallel Computing

Parallel Computing

MPI - relink

Running an MPI program

MPI program execution

User-directed scheduling

Debugging MPI

MPL - A Parallel C++

Pipeline example

Code Examples

The makefile

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Basic Fortran Support - BFS

Sample BFS Interfaces

BFS Method Invocation

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BFS Compilation and Linkage


Status - sites

Legion 1.3 Tools

Legion 1.3 Platforms

Queuing Systems

Getting Legion

Author: Andrew Grimshaw