Rob Pike - "Concurrency is not Parallelism"

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Rob Pike - "Concurrency is not Parallelism"

source: https://www.youtube.com/watch?v=cN_DpYBzKso

Notes

• the world is not object oriented, is actually parallel
• concurrency is dealing with a lot of things at once, parallel is doing a lot of things at once, one is about structure, the other is about execution.
• concurrency is a about by breaking down a program into pieces that can be executed independently.
• communication is the means to coordinate the independent executions.
• Paper Communicating Sequential Processes (1978)
• Paper Communicating Sequential Processes (2015)
• Performance improved by adding a concurrent procedure to a existing design.
• There many ways to beak the process down.
• That's concurrent design.
• Once we have the breakdown, parallelization can take in and correctness is easy.

Go demo

• Goroutines: they're like threads, but they're much cheaper
• Goroutines are multiplexed onto OS threads as required
• When a goroutine blocks, that thread blocks but no other goroutine blocks.
• Goroutines vs green threads Goroutines vs Coroutines

Conclusion

• Concurrency is powerful.
• Concurrency is not parallelism.
• Concurrency enables parallelism.
• Concurrency makes parallelism easy.