Concurrent or Parallel?
This is a book about concurrency, so why are we talking about parallelism? Although theyâre often used interchangeably, concurrent and parallel refer to related but different things.
Related but Different
A concurrent program has multiple logical threads of control. These threads may or may not run in parallel.
A parallel program potentially runs more quickly than a sequential program by executing different parts of the computation simultaneously (in parallel). It may or may not have more than one logical thread of control.
An alternative way of thinking about this is that concurrency is an aspect of the problem domainâyour program needs to handle multiple simultaneous (or near-simultaneous) events. Parallelism, ...
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