I don't want to be too much of a downer, but our experience running Clojure on 48-core machines was pretty depressing, with our speedups often being near zero or even negative (that is, running on 48 cores can be slower than running on 1, for a task that would seem to be a good candidate for parallelization, and with what would seem to be good techniques for doing the parallelization). Several people tried to help us diagnose/fix the problems (see this thread: https://groups.google.com/forum/?fromgroups=#!topic/clojure/48W2eff3caU), but I don't think that there has been a definitive resolution.
-Lee On Apr 27, 2013, at 11:23 PM, Yves S. Garret wrote: > I'll take a blind stab at this and say that Erlang might actually do > more poorly, unless the chip's interchip message passing is taken > advantage of by Erlang. If there's a separate piece of hardware > taking on the role of being the messenger, having to waste computer > cycles to send a message isn't terribly efficient. > > > On Sat, Apr 27, 2013 at 11:17 PM, Cedric Greevey <cgree...@gmail.com> wrote: > On Sat, Apr 27, 2013 at 11:13 PM, Yves S. Garret <yoursurrogate...@gmail.com> > wrote: > How would this compare to Erlang? > > > On Sat, Apr 27, 2013 at 10:51 PM, Cedric Greevey <cgree...@gmail.com> wrote: > https://en.wikipedia.org/wiki/Intel_MIC > > 50+ cores?! Clojure will leave every other language in the dust on something > like that, thanks to its inherently scaleable concurrency constructs. Try > writing a 50-threaded Java application without getting deadlocks all over the > place, or cheating and using very coarse-grained locks (have fun with the > task manager showing 2% CPU utilization when your app is running full-bore!). > > If big, 32-bit addressing spaces were what made automatic memory management > really begin to come into its own (and with it, Java), then it's doubtless > 50-core machines that will make automatic concurrency management really begin > to come into its own. > > Erlang might also do well on such a machine. The actor model likely involves > more communication among the cores to get full utilization, but then, the > page describes some sort of message-passing system among the cores on MIC, so > ... > > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > -- Lee Spector, Professor of Computer Science Cognitive Science, Hampshire College 893 West Street, Amherst, MA 01002-3359 lspec...@hampshire.edu, http://hampshire.edu/lspector/ Phone: 413-559-5352, Fax: 413-559-5438 -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
