4 ms·
The dictionary definition of concurrency contradicts this video. Concurrency is defined as "happening or existing at the same time".
by CoconutPilot 8y ago
The dictionary definition of concurrency contradicts this video. Concurrency is defined as "happening or existing at the same time".
- steamer25 8y agoI think what he means is that he's defining 'concurrent' as a sort of abstract parallelism which can run on 'n' CPU cores. It becomes concrete parallelization when you set n to 2 or more but can still be considered concurrent software architecture even if someone only ever runs their copy with n=1. To address another comment, I agree this distinction has limited utility (assuming I understand it correctly). This context of discussing architectures which promote abstract parallelism is probably about the only place it's useful. I agree that a strict/true interpretation of 'concurrency' (as distinct from Pike's definition) would not include time slice multi-tasking since it depends on the limits of human perception to appear as truly-concurrent/executed-in-parallel when it's actually fine-grained sequential processing.
- gpderetta 8y agoThe difference is instantaneously (parallelism) vs over a period of time (concurrency). Edit: compare a batch system (no concurrency and no parallelism), Vs a time sharing system on an uniprocessor (concurrency) Vs a time sharing system on a multiprocessor (parallelism).