Lecture 10: OpenMP Loop Scheduling

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Announcement

Code of the day: what does parallel actually do?

Data races are a correctness problem

OpenMP atomic

Cost and implementation

C++ atomics and compare-and-swap

Quiz: can this assertion fail?

Worksharing: divide work across a team

Canonical loops and independent work

Load balance versus locality

Static, dynamic, and guided schedules

Choosing a schedule

What the scheduler examples do

collapse: expose more iterations to one team

Summing a rectangular array

Quiz: collapse all three matrix-multiplication loops?