JOP - Java Optimized Processor

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Documentation

This page is the starting point for various documents.

JOP Reference Handbook

An Introduction to the Design Flow for JOP

Getting Started, an introduction of build process.

SimpCon - a Simple SoC Interconnect, Draft

Further support is available via the Yahoo group java-processor .

Thesis

Publiactions

Journal Articles

Martin Schoeberl, A Java processor architecture for embedded real-time systems,
Journal of Systems Architecture, 54/1--2:265--286, 2008. doi:10.1016/j.sysarc.2007.06.001 (pdf, bibtex).

Martin Schoeberl, Time-predictable Computer Architecture,
EURASIP Journal on Embedded Systems, vol. 2009, Article ID 758480:17 pages, 2009. EURASIP JES. (pdf, bibtex).

Walter Binder, Martin Schoeberl, Philippe Moret, and Alex Villazon. Cross-profiling for Java processors.
Software: Practice and Experience, 39/18:1439-1465, 2009. pdf

Martin Schoeberl, Wolfgang Puffitsch, Rasmus Ulslev Pedersen and Benedikt Huber. Worst-case execution time analysis for a Java processor.
Software: Practice and Experience, 40/6:507-542, 2010. pdf doi

Martin Schoeberl and Wolfgang Puffitsch. Non-blocking real-time garbage collection.
Trans. on Embedded Computing Sys., accepted, 2009. pdf

Christof Pitter and Martin Schoeberl. A real-time Java chip-multiprocessor.
Trans. on Embedded Computing Sys., 31 pages, accepted 2009. pdf

Martin Schoeberl, Stephan Korsholm, Tomas Kalibera, and Anders P. Ravn. A hardware abstraction layer in Java.
Trans. on Embedded Computing Sys., 42 pages, accepted 2009. pdf

Martin Schoeberl. Scheduling of hard real-time garbage collection. Real-Time Systems, 35 pages, accepted 2010. pdf doi

Reviewed Conference and Workshop Papers

2010

Martin Schoeberl, Christopher Brooks, and Edward A. Lee Code Generation for Embedded Java with Ptolemy.
In Proceedings of the 8th IFIP Workshop on Software Technologies for Future Embedded and Ubiquitous Systems (SEUS 2010), Waidhofen/Ybbs, October 2010. Springer pdf

Martin Schoeberl and Peter Hilber. Design and Implementation of Real-Time Transactional Memory.
In Proceedings of the 20th International Conference on Field Programmable Logic and Applications (FPL 2010), Milano, Italy, August 2010. IEEE Computer Society pdf

Martin Schoeberl, Florian Brandner, and Jan Vitek. RTTM: Real-time transactional memory.
In Proceedings of the 25th ACM Symposium on Applied Computing, Sierre, Switzerland, March 2010. ACM Press. pdf

2009

Martin Schoeberl, Wolfgang Puffitsch, and Benedikt Huber. Towards time-predictable data caches for chip-multiprocessors.
In Proceedings of the Seventh IFIP Workshop on Software Technologies for Future Embedded and Ubiquitous Systems (SEUS 2009), 2009. Springer, November 2009. pdf

Martin Schoeberl, Peter Puschner, and Raimund Kirner. A single-path chip-multiprocessor system.
In Proceedings of the Seventh IFIP Workshop on Software Technologies for Future Embedded and Ubiquitous Systems (SEUS 2009), 2009. Springer, November 2009. pdf

Rasmus Ulslev Pedersen and Martin Schoeberl. Educational case studies with an open source embedded real-time java processor.
In Proceedings of the Workshop on Embedded Systems Education (WESE 2009), October 2009. pdf

Stephen A. Edwards, Sungjun Kim, Edward A. Lee, Isaac Liu, Hiren D. Patel, and Martin Schoeberl. A disruptive computer design idea: Architectures with repeatable timing.
In Proceedings of IEEE International Conference on Computer Design (ICCD 2009), October 2009. Lake Tahoe, CA. pdf

Jack Whitham, Neil Audsley, and Martin Schoeberl. Using hardware methods to improve time-predictable performance in real-time Java systems.
In Proceedings of the 7th International Workshop on Java Technologies for Real-time and Embedded Systems (JTRES 2009), Madrid, Spain, September 2009. ACM Press. pdf

Martin Schoeberl, Walter Binder, Philippe Moret, and Alex Villazon. Design space exploration for Java processors with cross-profiling.
In Proceedings of the 6th International Conference on the Quantitative Evaluation of SysTems (QEST 2009), Budapest, Hungary, September 2009. IEEE Computer Society. (pdf, bibtex).

Philippe Moret, Walter Binder, Alex Villazon, Danilo Ansaloni, and Martin Schoeberl. Locating performance bottlenecks in embedded Java software with calling-context cross-profiling.
In Proceedings of the 6th International Conference on the Quantitative Evaluation of SysTems (QEST 2009), Budapest, Hungary, September 2009. IEEE Computer Society.

Philippe Moret, Walter Binder, Martin Schoeberl, Alex Villazon, and Danilo Ansaloni. Analyzing performance and dynamic behavior of embedded Java software with calling-context cross-profiling.
In Proceedings of the 7th International Conference on the Principles and Practice of Programming in Java (PPPJ 2009), Calgary, Alberta, Canada, August 2009. ACM. (pdf, bibtex).

Martin Schoeberl and Peter Puschner. Is chip-multiprocessing the end of real-time scheduling?
In Proceedings of the 9th International Workshop on Worst-Case Execution Time (WCET) Analysis, Dublin, Ireland, July 2009. OCG. (pdf, bibtex).

Benedikt Huber and Martin Schoeberl. Comparison of implicit path enumeration and model checking based WCET analysis.
In Proceedings of the 9th International Workshop on Worst-Case Execution Time (WCET) Analysis, Dublin, Ireland, July 2009. OCG. (pdf, bibtex).

Thomas Henties, James J. Hunt, Doug Locke, Kelvin Nilsen, Martin Schoeberl, and Jan Vitek. Java for safety-critical applications.
In 2nd International Workshop on the Certification of Safety-Critical Software Controlled Systems (SafeCert 2009), Mar. 2009. (pdf, bibtex).

Martin Schoeberl. Time-predictable cache organization.
In Proceedings of the First International Workshop on Software Technologies for Future Dependable Distributed Systems, STFSSD 2009, Tokyo, Japan, March 2009. IEEE Computer Society. Invited paper. (pdf, bibtex).

Andy Wellings and Martin Schoeberl. Thread-local scope caching for real-time Java.
In Proceedings of the 12th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing ISORC 2009, Tokyo, Japan, March 2009. IEEE Computer Society. (pdf, bibtex).

Florian Brandner, Tommy Thorn, and Martin Schoeberl. Embedded JIT compilation with CACAO on YARI.
In Proceedings of the 12th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing ISORC 2009, Tokyo, Japan, March 2009. IEEE Computer Society. (pdf, bibtex).

2008

Walter Binder, Alex Villazon, Martin Schoeberl, and Philippe Moret, Cache-aware cross-profiling for Java processors,
In Proceedings of the 2008 international conference on Compilers, architecture, and synthesis for embedded systems, CASES 2008, Atlanta, Georgia, October 2008. (pdf, bibtex).

Martin Schoeberl and Wolfgang Puffitsch, Non-blocking object copy for real-time garbage collection,
In Proceedings of the 6th International Workshop on Java Technologies for Real-time and Embedded Systems, JTRES 2008, September 2008. (pdf, bibtex).

Wolfgang Puffitsch and Martin Schoeberl, Non-blocking root scanning for real-time garbage collection,
In Proceedings of the 6th International Workshop on Java Technologies for Real-time and Embedded Systems, JTRES 2008, September 2008. (pdf, bibtex).

Walter Binder, Martin Schoeberl, Philippe Moret, and Alex Villazon, Cross-profiling for embedded Java processors,
In Proceedings of the 5th International Conference on the Quantitative Evaluation of SysTems , QEST 2008, St Malo, France, September 2008. (pdf, bibtex).

Martin Schoeberl, Application experiences with a real-time Java processor,
In Proceedings of the 17th IFAC World Congress, IFAC 2008, Seoul, Korea, July 2008. (pdf, bibtex).

Peter Puschner and Martin Schoeberl, On composable system timing, task timing, and wcet analysis,
In Proceedings of the 8th International Workshop on Worst-Case Execution Time (WCET) Analysis, WCET 2008, Prague, Czech Republic, July 2008. (pdf, bibtex).

Christof Pitter and Martin Schoeberl, Performance evaluation of a Java chip-multiprocessor,
In Proceedings of the 3rd IEEE Symposium on Industrial Embedded Systems, SIES 2008, Jun. 2008. (pdf, bibtex).

Stephan Korsholm, Martin Schoeberl, and Anders P. Ravn, Interrupt Handlers in Java,
In Proceedings of the 11th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing, ISORC 2008, Orlando, Florida, USA, May 2008. (pdf, bibtex).

Trevor Harmon, Martin Schoeberl, Raimund Kirner, and Raymond Klefstad, Toward libraries for real-time Java,
In Proceedings of the 11th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing, ISORC 2008, Orlando, Florida, USA, May 2008. (pdf, bibtex).

Martin Schoeberl, Stephan Korsholm, Christian Thalinger, and Anders P. Ravn, Hardware objects for Java,
In Proceedings of the 11th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing, ISORC 2008, Orlando, Florida, USA, May 2008. (pdf, bibtex).

Trevor Harmon, Martin Schoeberl, Raimund Kirner, and Raymond Klefstad, A modular worst-case execution time analysis tool for Java processors,
In Proceedings of the 14th IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS 2008, St. Louis, MO, United States, April 2008. (pdf, bibtex).

2007

Martin Schoeberl, SimpCon - a Simple and Efficient SoC Interconnect,
In Proceedings of the 15th Austrian Workhop on Microelectronics, Austrochip 2007, Graz, Austria, October 2007. (pdf, bibtex).

Martin Schoeberl and Jan Vitek, Garbage collection for safety critical Java,
In Proceedings of the 5th international workshop on Java technologies for real-time and embedded systems, JTRES 2007, Vienna, Austria, September 2007. (pdf, bibtex).

Christof Pitter and Martin Schoeberl, Towards a Java multiprocessor,
In Proceedings of the 5th international workshop on Java technologies for real-time and embedded systems, JTRES 2007, Vienna, Austria, September 2007. (pdf, bibtex).

Martin Schoeberl, Architecture for object oriented programming languages,
In Proceedings of the 5th international workshop on Java technologies for real-time and embedded systems, JTRES 2007, Vienna, Austria, September 2007. (pdf, bibtex).

Wolfgang Puffitsch and Martin Schoeberl, picoJava-II in an FPGA,
In Proceedings of the 5th international workshop on Java technologies for real-time and embedded systems, JTRES 2007, Vienna, Austria, September 2007. (pdf, bibtex).

M. Schoeberl, A Time-Triggered Network-on-Chip,
In International Conference on Field-Programmable Logic and its Applications , FPL 2007, Amsterdam, Netherlands, August, 2007. (pdf, bibtex).

C. Pitter and M. Schoeberl, Time Predictable CPU and DMA Shared Memory Access,
In International Conference on Field-Programmable Logic and its Applications , FPL 2007, Amsterdam, Netherlands, August, 2007. (pdf, bibtex).

R. Kirner and M. Schoeberl, Modeling the Function Cache for Worst-Case Execution Time Analysis,
In Proceedings of the 44rd Design Automation Conference , DAC 2007, San Diego, CA, USA, June 2007. (pdf, bibtex).

M. Schoeberl, Mission Modes for Safety Critical Java,
In 5th IFIP Workshop on Software Technologies for Future Embedded & Ubiquitous Systems , SEUS 2007, Santorini Island, Greece, May 2007. (pdf, bibtex).

M. Schoeberl, H. Sondergaard, B. Thomsen and A. P. Ravn, A Profile for Safety Critical Java,
In 10th IEEE International Symposium on Object/component/service-oriented Real-time distributed Computing , ISORC 2007, Santorini Island, Greece, May 2007. (pdf, bibtex).

2006

M. Schoeberl and R. Pedersen, WCET Analysis for a Java Processor,
In Proceedings of the Workshop on Java Technologies for Real-Time and Embedded Systems , JTRES 2006, Paris, France, October 2006. (pdf, bibtex).

R. Pedersen and M. Schoeberl, Exact Roots for a Real-Time Garbage Collector,
In Proceedings of the Workshop on Java Technologies for Real-Time and Embedded Systems , JTRES 2006, Paris, France, October 2006. (pdf, bibtex).

R. Pedersen and M. Schoeberl, An Embedded Support Vector Machine,
In Proceedings of the Fourth Workshop on Intelligent Solutions in Embedded Systems , WISES 2006, Vienna, Austria, June 2006. (pdf, bibtex).

Martin Schoeberl, Instruction cache fuer echtzeitsysteme, Austrian patent AT 500.858, April 2006.

M. Schoeberl, Real-Time Garbage Collection for Java,
In Proceedings of the 9th IEEE International Symposium on Object and Component-Oriented Real-Time Distributed Computing , ISORC 2006, Gyeongju, Korea, April 2006. (pdf, bibtex).

M. Schoeberl, A Time Predictable Java Processor,
In Proceedings of the Design, Automation and Test in Europe Conference, DATE 2006, Munich, Germany, March 2006. (pdf, bibtex).

2005

M. Schoeberl, Evaluation of a Java Processor,
In Tagungsband Austrochip 2005, Austrochip 2005, Vienna, Austria, October 2005. (pdf, bibtex).

M. Schoeberl, Design and Implementation of an Efficient Stack Machine,
In Proceedings of the 12th IEEE Reconfigurable Architecture Workshop, RAW 2005, Denver, Colorado, USA, April 2005. (pdf, bibtex).

F. Gruian, P. Andersson, K. Kuchcinski, and M. Schoeberl, Automatic Generation of Application-Specific Systems Based on a Micro-programmed Java Core,
In Proceedings of the 20th ACM Symposium on Applied Computing, Embedded Systems track, SAC 2005, Santa Fee, New Mexico, March 2005. (pdf, bibtex).

2004

M. Schoeberl, A Time Predictable Instruction Cache for a Java Processor,
In Workshop on Java Technologies for Real-Time and Embedded Systems, JTRES 2004, LNCS 3292, Agia Napa, Cyprus, October 2004. (pdf, bibtex).

M. Schoeberl, Design Rationale of a Processor Architecture for Predictable Real-Time Execution of Java Programs,
In Proceedings of the 10th International Conference on Real-Time and Embedded Computing Systems and Applications, RTCSA 2004, Gothenburg, Sweden, August, 2004. (pdf, bibtex).

M. Schoeberl, Real-Time Scheduling on a Java Processor,
In Proceedings of the 10th International Conference on Real-Time and Embedded Computing Systems and Applications, RTCSA 2004, Gothenburg, Sweden, August, 2004. (pdf, bibtex).

M. Schoeberl, Java Technology in an FPGA,
In Proceedings of the International Conference on Field-Programmable Logic and its applications, FPL 2004, Antwerp, Belgium, August 2004. (pdf, bibtex).

M. Schoeberl, Restricitons of Java for Embedded Real-Time Systems,
In Proceedings of the 7th IEEE International Symposium on Object-Oriented Real-Time Distributed Computing, ISORC 2004, Austria, Vienna, May 2004. (pdf, bibtex).

2003

M. Schoeberl, JOP: A Java Optimized Processor,
In Workshop on Java Technologies for Real-Time and Embedded Systems, JTRES 2003, LNCS 2889, Catania, Italy, November 2003. (pdf, bibtex).

M. Schoeberl, Design Decisions for a Java Processor,
In Tagungsband Austrochip 2003, Linz, Austria, October 2003. (pdf, bibtex).

M. Schoeberl, Using a Java Optimized Processor in a Real World Application,
In Proceedings of the First Workshop on Intelligent Solutions in Embedded Systems, WISES 2003, Vienna, Austria, June 2003. (pdf, bibtex).

Technical Reports

Martin Schoeberl, Hiren D. Patel, and Edward A. Lee. Fun with a deadline instruction.
Technical Report UCB/EECS-2009-149, EECS Department, University of California, Berkeley, Oct 2009. (pdf).

Martin Schoeberl, Walter Binder, and Alex Villazon. Object cache evaluation. Technical report, Technical University of Denmark, 2010. (pdf)

Working Paper

JOP

jop3_arch.ppt Power Point presentation of JOP.

FPGA

A small introduction to load a simple design to the Cyclone board can be found here: hello_world.pdf

tuning.pdf Tuning a Processor for FPGA Technology, describes how to squeeze out a few nano seconds for a higher clock frequency in JOP; now 100 MHz ;-)