Basic HTML version of Foils prepared Jan 1 99

Foil 37 Java and Parallelism I?

From aJava Grande and Pragmatic Programming Environments Invited Talk at ISCOPE 98, Santa Fe -- Dec 10 98. by Geoffrey 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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