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Questions about algorithms or programs that compute on multiple processing units simultaneously. Not to be confused with concurrent or distributed computing!

Common category tags are but also if the question is about parallel complexity (buzzwords include e.g. PRAM or NC).

Find a general introduction on fitting topics on Wikipedia.

In particular, contrast with and which have different focus. See these discussions for more information on this:

That said, if you run into issues in your parallel algorithm, certainly use this tag in addition!