4 ms·

Pretty sure that's what pg's said it is. Personally, that's way too short, as I'll leave threads open for half a day without reading it, then can't comment. I

• gnaritas 19y ago
  Because they take up ram on the server. 20 minutes is standard session timeout for most session based web frameworks.
  • phaedrus 19y ago
    I wonder - would it be technically feasible to page the continuations out to temporary files on the server? Kind of like cookies, but on the server instead of the client!
    • shiro 19y ago
      Technically possible. There are a few Scheme implementations that have persistent continuation (all I know is JVM based ones). Also this page contains a link to the slides that talks about persistent delimited continuation in OCaml: http://logic.cs.tsukuba.ac.jp/Continuation/program.html http://logic.cs.tsukuba.ac.jp/Continuation/program.html Making continuations serializable may cost its implementation, so whether it scales well for yc.news is anothoer question. I don't know the answer for it.
      • LogicHoleFlaw 19y ago
        In lua at least, continuations have a 1k stack overhead in memory per continuation. I believe they are serializable as well... I'll have to double-check that. At 1k+ a pop they're not cheap, but are manageable. Having my tabs open last for a couple of days instead of 30 minutes would make the site more pleasant for me.
  • axod 19y ago
    Reason enough not to use a 'session based web framework'. If PHP can do it...