Tasks vs GenServer

[axelson]

@mgwidmann

One limitation I ran into using Task.async_stream , one slow process will stop the processing of future work. Say you have 1000 items and number 30 takes significantly more time than the rest (as is with email commonly), processing at a concurrency of 8 for example the 39th task won’t be executed because it will be waiting on the 30th to complete. This happens because the Task.async_stream function ensures ordering, using a selective receive against the PID.

If you don’t want this behavior you can set ordered to false and then the output will not be buffered at all.