Ask HN: Some examples of parallel but not concurrent processing

2 points

9 years ago

Lately I've been studying the different async workflows and the most confusing bit (so far) is the difference between concurrent execution and parallel execution.

I have examples for concurrent-not-parallel, like single threaded processes or a multi-threaded program on a single thread processor.

What I cannot find are examples of scenarios where the execution is parallel, but not concurrent. TBH, it seems impossible (so far).

Wikipedia did give me one - Bit-level parallelism[1]. But that topic is a bit out of reach for me (again, so far).

Can anyone give me a more simple parallel-not-concurrent execution scenario?

[1]: https://en.wikipedia.org/wiki/Bit-level_parallelism

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