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Careful what data you send or how to tank your performance with Task.async

PragTob

PragTob

Careful what data you send or how to tank your performance with Task.async

I ran into an interesting problem recently where simple concurrency on the BEAM via Task.async made my application a lot slower and a lot more memory hungry. This blog post illustrates the issue with a short example, where processing 3 non-trivial actions on a list in parallel is slower than doing it sequentially, and then explains why this happens and what can or can’t be done about it.

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