Basic HTML version of Foils prepared November 5 98

Foil 47 Java and Parallelism?

From Integration of Scientific and Technical Computing with Enterprise Information Systems: Gateway and IPSE ASC Dayton Ohio Invited Presentation -- October 29 98. by Geoffrey C. Fox


1 The Web integration of Java gives it excellent "network" classes and support for message passing.
2 Thus "Java plus message passing" form of parallel computing is actually somewhat easier than in Fortran or C.
3 Coarse grain parallelism very natural in Java and we have illustrated this with WebFlow
4 "Data Parallel" languages features are NOT in Java and have to be added extending ideas from HPF and HPC++ etc
  • e.g. NPAC's HPJava translates to Java+Messaging just as HPF translates to Fortran plus message passing
5 Java has built in "threads" and a given Java Program can run multiple threads at a time
  • In Web use, allows one to process Image in one thread, HTML page in another etc.
  • threads can be used to do more general parallel computing but only on shared memory computers

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