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Adding basic support for stackless threads #4145
@msimberg I think that this requires a bit more experimentation/time. Let's wait with this one until we are sure that we see a gain and do not introduce undue overheads to the common case. The code as is decreases the performance of running 500000 tasks by about 3% compared to master (for the stack-full case), but improves things for the new stack-less threads by 7% (compared to master). I would like to do a better analysis and avoid any decrease in performance compared to what we have.