> you do compete with Go (4 kB initial stack segment) and Erlang (2.4 kB on 64 bit).
Actually, goroutines have a default stack size of 8kb since 1.2. Also, applicable to this discussion, in 1.3 Go will be moving away from segmented stacks to contiguous growable stacks: https://docs.google.com/document/d/1wAaf1rYoM4S4gtnPh0zOlGzWtrZFQ5suE8qr2sD8uWQ/pub On Tue, Oct 22, 2013 at 12:52 AM, Patrick Walton <pwal...@mozilla.com>wrote: > On 10/21/13 8:48 PM, Daniel Micay wrote: > >> Segmented stacks result in extra code being added to every function, >> loss of memory locality, high overhead for calls into C and >> unpredictable performance hits due to segment thrashing. >> >> They do seem important for making the paradigm of one task per >> connection viable for servers, but it's hard to balance that with other >> needs. >> > > I'm not sure they're that important even for that use case. Is 4 kB (page > size) per connection that bad? You won't compete with nginx's memory usage > (2.5 MB for 10,000 connections, compared to 40 MB for the same with 4 kB > stacks), but you do compete with Go (4 kB initial stack segment) and Erlang > (2.4 kB on 64 bit). > > Besides, if we really wanted to go head-to-head with nginx we could > introduce "microthreads" with very small stack limits (256 bytes or > whatever) that just fail if you run off the end. Such a routine would be > utterly miserable to program correctly but would be necessary if you want > to compete with nginx in the task model anyhow :) > > Realistically, though, if you are writing an nginx killer you will want to > use async I/O and avoid the task model, as even the overhead of context > switching via userspace register save-and-restore is going to put you at a > disadvantage. Given what I've seen of the nginx code you aren't going to > beat it without counting every cycle. > > Patrick > > > ______________________________**_________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/**listinfo/rust-dev<https://mail.mozilla.org/listinfo/rust-dev> >
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