On Wed, Jul 22, 2009 at 9:56 PM, tmountain <tinymount...@gmail.com> wrote:
> > I've written a short blog post on using Clojure to search for > available ssh servers on my companies VPN. It starts with a single- > threaded example and then adds concurrency. The performance difference > in this case was pretty extreme. Sweeping 254 hosts in a serial single- > threaded fashion took twelve minutes with a network timeout of five > seconds per host. Adding concurrency resulted in a full sweep in six > seconds. If nothing else, I guess this is a good illustration of what > a huge win concurrency can performance wise. > > I initially tried to use pmap to parallelize the connections, but it > didn't provide any improvement (maybe I did it wrong?). pmap will only use 1 thread per CPU/core, and therefore is only useful for computationally intensive functions. send-off definitely sounds like the right solution for this type of problem. -- Cosmin Stejerean http://offbytwo.com --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
