MPJ Express is a thread-safe Java messaging library that provides a full implementation of the mpiJava 1.2 API specification. This specification defines a MPI-like bindings for the Java language. We have implemented two communication devices as part of our library, the first, called niodev is based on the Java New I/O package and the second, called mxdev is… (More)
With the transition to multicore processors almost complete, the parallel processing community is seeking efficient ways to port legacy message passing applications on shared memory and multicore processors. MPJ Express is our reference implementation of Message Passing Interface (MPI)-like bindings for the Java language. Starting with the current release,… (More)
(2009) A comparative study of Java and C performance in two large-scale parallel applications. SUMMARY In the 1990s the Message Passing Interface Forum defined MPI bindings for Fortran, C, and C++. With the success of MPI these relatively conservative languages have continued to dominate in the parallel computing community. There are compelling arguments in… (More)
One of the most challenging aspects to designing a Java mes-saging system for HPC is the intermediate buffering layer. The lower and higher levels of the messaging software use this buffering layer to write and read messages. The Java New I/O package adds the concept of direct buffers, which—coupled with a memory management algorithm—opens the possibility… (More)
The need to increase performance while conserving energy lead to the emergence of multi-core processors. These processors provide a feasible option to improve performance of software applications by increasing the number of cores, instead of relying on increased clock speed of a single core. The uptake of multi-core processors by hardware vendors present… (More)
Efforts to build Java messaging systems based on the MPI standard have typically followed either the JNI approach or the pure Java approach. On commodity platforms like Fast Ethernet, advances in JVM (Java Virtual Machine) technology now enable networking applications written in Java to rival their C counterparts. On the other hand, improvements in… (More)
Gadget-2 is a massively parallel structure formation code for cosmological simulations. In this paper, we present a Java version of Gadget-2. We evaluated the performance of the Java version by running a colliding galaxy simulation and found that it can achieve around 70% of C Gadget-2's performance.