Moving to Realtime Java for Embedded Systems af James Hunt, Aicas

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The document discusses using Java for embedded systems and the JamaicaVM real-time Java virtual machine. It outlines barriers to using Java such as cost, stability, and technical uncertainties. It then covers JamaicaVM's attributes like performance, size, and platform support. The document also discusses porting to different processors and operating systems, as well as considerations for drivers, networking, and the build process.

Technology Business

aicas technology
Moving to Realtime Java for
Embedded Systems
Dr. James Hunt
CEO, aicas GmbH
Temadag om Java, Sept. 2013

2JamaicaVM: Realtime Response for Java Applications
Barriers to Using Java in ES
Business Uncertainties
cost
commercial stability
support
Techniclal Uncertainties
size and speed
device access
OS issues
how does it work in practice

3JamaicaVM: Realtime Response for Java Applications
Business Issues
Cost
Effect on Product Cost
Porting Costs
External Dependencies
Licensing risk
Support risk
Obsolecense risk

4JamaicaVM: Realtime Response for Java Applications
Resource Requirements
Processor
32 bit or 64 bit
speed depends on application
graphics?
computational intesity?
Memory
512k has been done
from 4M w/o graphics, 20M w/ graphics
depends on application

5JamaicaVM: Realtime Response for Java Applications
Attributes
Performance
500usec periodic thread w/ allocation on Linux w/
Preempt patch, Intel Core Duo, 5usec jitter
Similar result on VxWork, PowerPC
Size
minimum for HelloWorld >1Mbyte
depends on application complexity
Java Versions
J2SE 1.6 & J2ME 1.4 both w/ RTSJ

6JamaicaVM: Realtime Response for Java Applications
JamaicaVM Platform Support
RTOS
VxWorks
Linux/RT
QNX
WinCE
Windows XP...
Integrity
ThreadX
Solaris
Processors
PowerPC
SH4
ARM
Atom
x86
IA-64

7JamaicaVM: Realtime Response for Java Applications
Porting
Processor dependencies
No JIT
base AOT uses platform C compiler
Operating System
easier for POSIX like systems
harder for others
Graphics
most costly
leverage standard libraries

8JamaicaVM: Realtime Response for Java Applications
Operating System
Is an RTOS Required? Yes for
scheduling
network
file system
boad support package
Is an RTOS required?
Yes for hard realtime
No for soft realtime

9JamaicaVM: Realtime Response for Java Applications
Drivers
Device access
JNI w/ C or C++ (SWIG)
RawMemory—access control and data registers
Happenings—manage interrupts
Interrupt Service Routined
Networking
ethernet
CAN
etc.

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Moving to Realtime Java for Embedded Systems af James Hunt, Aicas

1. aicas technology Moving to Realtime Java for Embedded Systems Dr. James Hunt CEO, aicas GmbH Temadag om Java, Sept. 2013

2. 2JamaicaVM: Realtime Response for Java Applications Barriers to Using Java in ES Business Uncertainties cost commercial stability support Techniclal Uncertainties size and speed device access OS issues how does it work in practice

3. 3JamaicaVM: Realtime Response for Java Applications Business Issues Cost Effect on Product Cost Porting Costs External Dependencies Licensing risk Support risk Obsolecense risk

4. 4JamaicaVM: Realtime Response for Java Applications Resource Requirements Processor 32 bit or 64 bit speed depends on application graphics? computational intesity? Memory 512k has been done from 4M w/o graphics, 20M w/ graphics depends on application

5. 5JamaicaVM: Realtime Response for Java Applications Attributes Performance 500usec periodic thread w/ allocation on Linux w/ Preempt patch, Intel Core Duo, 5usec jitter Similar result on VxWork, PowerPC Size minimum for HelloWorld >1Mbyte depends on application complexity Java Versions J2SE 1.6 & J2ME 1.4 both w/ RTSJ

6. 6JamaicaVM: Realtime Response for Java Applications JamaicaVM Platform Support RTOS VxWorks Linux/RT QNX WinCE Windows XP... Integrity ThreadX Solaris Processors PowerPC SH4 ARM Atom x86 IA-64

7. 7JamaicaVM: Realtime Response for Java Applications Porting Processor dependencies No JIT base AOT uses platform C compiler Operating System easier for POSIX like systems harder for others Graphics most costly leverage standard libraries

8. 8JamaicaVM: Realtime Response for Java Applications Operating System Is an RTOS Required? Yes for scheduling network file system boad support package Is an RTOS required? Yes for hard realtime No for soft realtime

9. 9JamaicaVM: Realtime Response for Java Applications Drivers Device access JNI w/ C or C++ (SWIG) RawMemory—access control and data registers Happenings—manage interrupts Interrupt Service Routined Networking ethernet CAN etc.

10. 10JamaicaVM: Realtime Response for Java Applications JamaicaVM Build Process Optimization JamaicaVM Builder JamaicaVM Builder Java Byte Code Interpreted Executable Profiled Executable JamaicaVM Builder Profile Optimized Executable IDE Source Code Javac Test on Host (JamacaVM Pluggin) Test on Target Test Performance

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