PCJ is a library for Java language that helps to perform parallel and distributed calculations. The current version is able to work on the multicore systems connected with the typical interconnect such as ethernet or infiniband providing users with the uniform view across nodes.
Download PCJ library (jar file of 29.04.2017 ver. 5.0.6) Latest (bug fixing release)!
Download PCJ manual (pdf) for PCJ 5 New!
The PCJ library can be used with no cost at BSD license. It requires Java 8 and no additional tools or comilers. The PCJ library for Java 7 is available in the dowload section.
The source code is available at GitHub: https://github.com/hpdcj/pcj
Version 5.0.6 fixes some bugs occuring with the massive communication.
Version 5.0.3 contains support for Intel KNL chips.
Version 5 introduces asyncPut() and asyncGet() methods; put() and get() methods are now synchronous. There is new handling of shared variables. The code developed for PCJ 4 hast to be modified. For details please reffer to the JavaDoc file.
The usage should be acknowledged by reference to the PCJ web site and/or reference to the papers:
- M. Nowicki, M. Ryczkowska, Ł. Górski, M. Szynkiewicz, P. Bała PCJ - a Java library for heterogenous parallel computing In: X. Zhuang (Ed.) Recent Advances in Information Science (Recent Advances in Computer Engineering Series vol 36) WSEAS Press 2016 pp. 66-72
- M. Nowicki, Ł. Górski, P. Grabarczyk, P. Bała PCJ - Java library for high performance computing in PGAS model In: W. W. Smari and V. Zeljkovic (Eds.) 2012 International Conference on High Performance Computing and Simulation (HPCS) IEEE 2014 pp. 202-209
- M. Nowicki, P. Bała PCJ-new approach for parallel computations in java In: P. Manninen, P. Oster (Eds.) Applied Parallel and Scientific Computing, LNCS 7782, Springer, Heidelberg (2013) pp. 115-125
- M. Nowicki, P. Bała Parallel computations in Java with PCJ library In: W. W. Smari and V. Zeljkovic (Eds.) 2012 International Conference on High Performance Computing and Simulation (HPCS) IEEE 2012 pp. 381-387
Usage of the PCJ:
- M Ryczkowska, M Nowicki, P Bala Level-synchronous BFS algorithm implemented in Java using PCJ Library In: 2016 International Conference on Computational Science and Computational Intelligence (CSCI), Las Vegas, NV, USA}, 2016, pp. 596-601
- Ł Górski, F Rakowski, P Bała A case study of software load balancing policies implemented with the PGAS programming model In: W. W. Smari, V. Zejkovic (Eds) (eds.) 2016 International Conference on High Performance Computing \& Simulation (HPCS),
IEEE 2016, pp. 443 - 448
- M Ryczkowska, M Nowicki, P Bala The Performance Evaluation of the Java Implementation of Graph500 In: R. Wyrzykowski et all (eds.) Parallel Processing and Applied Mathematics, Springer 2016 pp. 221-230
- Ł Górski, F Rakowski, P Bała Parallel Differential Evolution in the PGAS Programming Model Implemented with PCJ Java Library In: R. Wyrzykowski et all (eds.) Parallel Processing and Applied Mathematics, Springer 2015, pp. 448-458
- M Nowicki, M Marchwiany, M Szpindler, P Bała On-line Service for Teaching Parallel Programming In:Euro-Par 2015: Parallel Processing Workshops, Springer 2015, pp. 78-89
- M. Ryczkowska Evaluating PCJ library for graph problems-Graph500 in PCJ In: W. W. Smari and V. Zeljkovic (Eds.) 2012 International Conference on High Performance Computing and Simulation (HPCS) IEEE 2014 pp. 1005-1007
Contact: firstname.lastname@example.org email@example.com
Nowadays, almost everyone interested in parallel and distributed calculations pays a lot of attention to the development of the hardware. However, changes in hardware are associated with changes in the programming languages. A good example is Java with its increasing performance and parallelization tools introduced in Java SE 5 and improved in Java SE 6 . Java, from the beginning, put emphasis on parallel execution introducing as far back as in the JDK1.0 the Thread class. The parallelization tools available for Java include solutions based on various implementations of the MPI library , distributed Java Virtual Machine  and solutions based on Remote Method Invocation (RMI) .
PCJ is a library [1, 2] for Java language that helps to perform parallel and distributed calculations. The current version is able to work on the multicore systems connected with the typical interconnect such as ethernet or infiniband providing users with the uniform view across nodes.
The library implements partitioned global address space model  and was inspired by languages like Co-Array Fortran , Unified Parallel C  and Titanium . In contrast to listed languages, the PCJ does not extend nor modify language syntax. For example, Titanium is a scientific computing dialect of Java, defines new language constructs and has to use dedicated compiler. When developing the PCJ library, we put emphasis on compliance with Java standards. The programmer does not have to use additional libraries, which are not part of the standard Java distribution. Compared to the Titanium, PCJ does not need a dedicated compiler to preprocess code.
The first prototype version of PCJ  has been developed from scratch using the Java SE 7. Java SE 7 implements Sockets Direct Protocol (SDP), which can increase network performance over infiniband connections. Than the internode communication has been added allowing users to run multiple PCJ threads withon single Java Virtual Machine. Current version has been developed in 2013 and includes many bug fixes and improvements compare to the initial version. Especially the users interface has been stabilized.