Shared Memory

• Multi-Process Shared Memory

  • shmget, shmat
  • Synchronization via UNIX semaphores

• Threads

  • Compiler-generated “automatic” parallelism
  • Thread libraries - CPSlib, Solaris, Windows NT, Pthreads

• Multi-process vs. Threads

  • Threads are created more quickly and are “lighter”
  • Threads can ignore data ownership - risk of corruption
  • Multi-process ensures automatic data localization
  • Debugging probably easier with MP

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