PARALLEL PROCESSING

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DEPENDENCIES

Can you break the entire problem (except for the

spawn and gather) into independent chunks?

Yes - potential candidate for parallel execution

No - the benefits of parallelization depend

directly on the time spent executing parallel code

Identify the portions of your code that do not

have dependencies

We will not discuss solutions with dependencies

Tuesday, August 20, 13

presentation - VirtualRDC @ Cornell - Cornell University

DEPENDENCIES Can you break the entire problem (except for the spawn and gather) into independent chunks? Yes - potential candidate for parallel execution No - the benefits of parallelization depend directly on the time spent executing parallel code Identify the portions of your code that do not have dependencies We will not discuss solutions with dependencies Tuesday, August 20, 13

AMDAHL’S LAW P=Number of Cores alpha=proportion of time NOT spent in parallel Diminishing Returns to increasing P for a problem of fixed size Tuesday, August 20, 13

Page 1 and 2: Tuesday, August 20, 13 PARALLEL PRO
Page 3 and 4: THREADS VS PROCESSES Both can be us
Page 5: BENEFITS VS COSTS Using more cores
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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