Zak, This may not be your main issue and I haven't done enough testing with my own code to know if it's even my main issue, but I've found that things appear to go better for me on multicore machines if I invoke java with the -XX:+UseParallelGC option.
-Lee On May 30, 2010, at 12:31 PM, Zak Wilson wrote: > I'm running Clojure code on an early Mac Pro with OS X 10.5 and Java > 1.6. It has two dual-core Xeon 5150s and 5GB of memory. > > I'm not getting the performance I expected despite top reporting 390% > steady-state CPU use, so I wrote some trivial tests to see if I was > actually getting the benefit of all four cores. It runs about twice as > fast with four cores as with one, and only slightly faster with three > or four than with two. This code being trivially parallel, I was > expecting nearly 4x the speed with four cores. > > Here are the tests and results: http://gist.github.com/418631 > > I'd appreciate it if anybody could > > a. point out any problems with my code that might be hurting > performance > b. try this out on your own 3+ core machine and see if you have better > results -- Lee Spector, Professor of Computer Science School of 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 Check out Genetic Programming and Evolvable Machines: http://www.springer.com/10710 - http://gpemjournal.blogspot.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
