PARALLEL PROCESSING

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WHY <strong>PARALLEL</strong> <strong>PROCESSING</strong>?! Single core performance growth has slowed. More cost-effective to add multiple cores. Tuesday, August 20, 13
THREADS VS PROCESSES Both can be used to do parallel processing A process can launch multiple threads (threads run only on the same node) A thread runs within a process and has access to the memory and resources available to that process A user or program can launch multiple processes (they can run on the same node or across nodes) and communicate via IPC Different tools for working with threads and processes, although the goal is the same Tuesday, August 20, 13
Page 1: Tuesday, August 20, 13 PARALLEL PRO
Page 5 and 6: BENEFITS VS COSTS Using more cores
Page 7 and 8: AMDAHL’S LAW P=Number of Cores al
Page 9 and 10: EXAMPLE (CONTINUED) Within each gro
Page 11 and 12: SHOULD I GO PARALLEL? Careful tunin
Page 13 and 14: TAKE CONTROL OF IMPLICIT THREADS SA
Page 15 and 16: PBS PRO Job scheduler on the SSG th

PARALLEL PROCESSING

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