E-mail thread had less to do with issues of Clojure per se, but more with issues the JVM had running on a 48-way machine. Or am I missing something?
IIRC the Azul people played with Clojure a bit, I wonder if their suped-up JVM allows Clojure to perform any better. Timothy On Sat, Apr 27, 2013 at 9:36 PM, Lee Spector <lspec...@hampshire.edu> wrote: > > 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. > > > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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