On Jul 7, 2010, at 8:47 PM, gary b <gary.b...@gmail.com> wrote: > This blog post presents data showing that threading is faster than > NIO: > http://mailinator.blogspot.com/2008/02/kill-myth-please-nio-is-not-faster-than.html > I would not consider this article to be the definitive answer to the question of NIO vs threads. My experience with high throughput java servers is NOT what this guys represents. You can push NIO very far if you want to, although it is hard. The advantage with NIO is that your code doesn't have to go through the many abstraction layers that make things very easy for the developer but quickly get in your way if you want raw performance.
Also, in some instances with NIO you can even work directly with kernel buffers, and so the network data doesn't even need to be copied from the kernel space into the user space. That takes time if you are managing a lot of network traffic. Finally, as it has already been discussed, threads use memory, lots of it. If the number of threads is not bound, a traffic spike will make your memory requirements skyrocket, either exhausting the memory in your JVM or prompting the OS to start paging on its VM. In the second case, once your server is hitting Virtual Memory all those threads will cause page misses left and right, and you'll watch your server grind to a halt, since it will not be returning responses but still receiving requests and thus creating even more new threads, happily marching into a death spiral. Even if that article is right, fast != scalable, or high throughput, or bounded. Yes, I have issues with that article as I have seen it quoted one too many times ;) > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
