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It buys you the stack size of each thread which only matters if you have a stupid amount of connections. In this article[1] the author makes a comparison between the 2 models and 7000 concurrent users will chew up 450MB of stack space. Of course this is adjustable.

[1] http://byteworm.com/evidence-based-research/2017/03/04/compa...




On most Linux systems stack is allocated with mmap with overcommiting. Until first write all those pages will share same zeroed page AFAIK. Then only overwritten pages will be allocated.

Am I wrong?


How do you save on stack space with asyncio? Don't you have to keep the coroutine object in memory somewhere?


I think the idea is that these "coroutine objects" (or the equivalent structure in whatever language) is smaller than the typical stack size for a thread. For example, the default stack size on Windows is 1 MB. So if you have a thread per connection, obviously this is going to take up a decent amount of memory. I'm guessing the answer to this is a thread pool so your memory usage doesn't blow up.

https://msdn.microsoft.com/en-us/library/windows/desktop/ms6...




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