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?). I opted to use agents with send-off because the documentation specifically mentions that send-off is intended for situations where the applied function might block. Anyway, I welcome suggestions as I'm still learning. The article can be found here: http://travis-whitton.blogspot.com/2009/07/network-sweeping-with-clojure.html Thanks, Travis --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
