Problems and Issues

• Adaptive Parallelism

  • heterogeneous, asynchronous, amorphous networks
  • cannot rely on specific number of processorsor static info about processor speeds
  • eager scheduling, Linda, coarse-grain dataflow, Cilk

• Fault-Tolerance

  • voting, replication, spot-checking, backtracking, checkpointing

• Computational Security

  • danger of sabotage and spying
  • digital signatures, checksums
  • encrypted computation, dynamic obfuscation

• Scalability

  • need to support volunteer servers

• Programmer and User-Interface

  • make it easy, attractive, and powerful

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