Basic HTML version of Foils prepared May 18 99

Foil 25 Java and Parallelism I?

From Java Grande Overview IPPS/SPDP 1999 International Workshop on Java for Parallel and Distributed Computing San Juan Puerto Rico -- April 12 99. by Geoffrey C. Fox
1 There are several forms of parallelism
  • a) Fine grain functional parallelism as in overlap of communication and computation
  • b) Coarse grain distributed objects
  • c) Fine grain data parallelism which is historically either implemented with high level language (HPF) or explicit user defined message passing(MPI) -- this gives "massive parallelism" as in parallelism over grid points or particles in scientific computing
2 In a Nutshell, Java is better than previous languages for a) and b) and no worse for c)
  • Automatically provides "task parallelism" which needs to be added in painful fashion for Fortran
  • The Web integration of Java gives it excellent "network" classes and support for message passing.
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