Java and Mobility

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Topic: Java Programming

Short Desciption:
... devices have outnumbered PCs •Do you own a mobile phone? •Do you own some other

 

Content Inside:
MPJExpressMeets Gadget: Towardsa Java Code for Cosmological Simulations Mark Baker1, Bryan Carpenter2 and Aamir Shafi3 1 ACET, University of Reading 2 OMII, University of Southampton 3 DSG, University of Portsmouth Abstract. Gadget-2 is a massively parallel structure formation code for cosmological simulations. In this paper, we presenta 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% ofC Gadget-2sperformance. 1 Introduction Various computer scientists have argued that Java could make an excellent language for developing scientific codes. To date this argument has not con- vincedtoomany practising computational scientists. The scarcity of high-profile number-crunching codes implemented in Java does not help the case. We have recently released MPJ Express[1], a thread-safe, production quality Java messaging system for high performance computing. To help establish the practicality of real scientific computing using message passing Java we have ported the parallel cosmological simulation code, Gadget-2, from Cto Java, using MPJExpress. Gadget-2[7]isamassively parallel structure formation code developed by Volker Springelatthe Max Planck Institute of Astrophysics. Versions of Gadget-2 have been used in various research papers in astrophysics literature, including the noteworthy"Millennium Simulation"[8]—the largest ever model of the Universe. Producing a Java version of Gadget is an experiment that helps us to un- derstandwhere Java stands in comparison to C—an already established HPC language. Concerns about Javasperformancehave stopped many computational scientists from seriously considering it. But constant improvements in JIT (Just In Time) compilers, which translatebytecode into the native machine code at runtime, have improved thecompuational performance. Exploitation of Java for simulation pr ...

 

 

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