Java Environment for Parallel Realtime Development Platform Independent Software Development for Multicore Systems

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Realtime Development

Platform Independent Software Development

for Multicore Systems

Ingo Prötel, aicas GmbH

Computing Frontiers

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Jeopard—Java Environment for Parallel Realtime Development

Jeopard-Project:

Java Envorinment for Parallel Realtime

Development

Project Details:

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7th FP Objective ICT-2007.3.4: Computing Systems

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started January, 2008

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M-Lead: The Open Group

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Project Goal

Provide a platform independent software development environment

for

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complex

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safe

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Realtime

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multicore systems.

Leverage off existing technology and past projects:

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Java, RTSJ, SC-Java

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Multilayered Approach

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Applications

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Tools

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API (Java and C)‏

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Java VM

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Operating Systems (RTOS)‏

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CPU Architecture

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Corresponds to layered structure of the project

Project Work Package Structure

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Multi-Java Optimized Processor (JOP)‏

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HW support for synchronization

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WP 3: OS Layer

Corresponds to layered structure of the project

Project Work Package Structure

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Extend partitioning OS

–

HAL

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Microkernel API

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Kernel validation

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Coordination between OS and Java

threads

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CPU usage measurement

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CPU budget

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WP 3: OS Layer

WP 4: Virtual Machine Layer

Corresponds to layered structure of the project

Project Work Package Structure

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Realtime Memory Management

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Parallel and incremental

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Synchronization

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Java Monitors

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GC data structures

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Sub-word data access

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AOT-Compiler support

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WP 3: OS Layer

WP 4: Virtual Machine Layer WP 5: API Layer

Corresponds to layered structure of the project

Project Work Package Structure

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OS level API

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Java level API

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Standardization

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Multicore Association

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Java Community Process

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WP 3: OS Layer

WP 6: Analysis Tools

Corresponds to layered structure of the project

Project Work Package Structure

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Static Analysis for Correctness

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Fresco contract model for Java

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Concurrent Unit Testing FW

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WP 3: OS Layer

WP 6: Analysis Tools WP 7: Validation

Corresponds to layered structure of the project

Project Work Package Structure

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Multicore Radar Processor

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Software Radio

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Airlines Operation Communication

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WP 3: OS Layer

WP 6: Analysis Tools WP 7: Validation

WP 1: Requirements Analysis

WP 9: Management

Corresponds to layered structure of the project

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POSIX

Jamaica VM

Multicore platform

P1

P3

Pike OS microkernel

Expected Results: Jamaica on PikeOS

Multicore platform

P1

P3

Pike OS microkernel

Run in partition with POSIX identity using its own

scheduler

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Expected Results

RTOS

Java VM

Multi-JOP

Java application

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Expected Results

RTOS

Java VM

Multi-JOP

DFA

Java application

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Expected Results

RTOS

Java VM

Multi-JOP

DFA

Concurrent

Unit Test

Java VM

Java application

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Some Work Items (1)‏

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Parallel deterministic garbage collection

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Root scanning of multiple cores

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Parallel mark and sweep

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Locking of global data structures

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CPU partitioning on a multicore system

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Some Work Items (2)‏

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Realtime parallel scheduling

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OS scheduler provides CPU time on a set of CPUs

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Java scheduler assigns threads to CPUs

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Use concurrency information from static analysis

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Some Work Items (3)‏

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Nonfunctional analysis on multicore

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Show lack of deadlocks

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Identify race conditions

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Escape analysis

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Unit testing for multicore

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Simulate fully parallel environment

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Prune test cases

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Expected Technical Impact

Reduced SW Development Cost

through

standardised APIs that permit interoperability and

reuse of code on different platforms

Higher Reliability

through analysis tools

Reduced Time-to-Market

through standardized

development methods (Java) even for critical

embedded applications (e.g., in avionics,

automotive, industrial markets).

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Conclusion

Jeopard will provide

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standard APIs for Java (multicore RTSJ) and C

(multicore posix threads)‏

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scheduling technology for multicore RTOS

(multicore PikeOS)

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scheduling and memory management technology

for realtime Java VM (multicore JamaicaVM)‏

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