You can use Visual VM (https://visualvm.dev.java.net/) to see how the VM is using memory. I don't think it specifically show a log of GC activity, but it is pretty clear from the graphs.
mch On Nov 5, 8:41 am, "pepijn (aka fliebel)" <pepijnde...@gmail.com> wrote: > I don't know how to check the GC activity on my project, but I did run > Mian on Jython. It performs much like my initial Clojure version. It > consumes absurd amounts of memory and never finishes. > > So I think we can safely say that Java's GC or the way it stores data > is less efficient on this type of problem than Python. > > On Nov 4, 10:43 pm, Mike Meyer <mwm-keyword-googlegroups. > > > > > > > > 620...@mired.org> wrote: > > On Thu, 4 Nov 2010 22:28:12 +0100 > > Pepijn de Vos <pepijnde...@gmail.com> wrote: > > > > Hi all, > > > > I have written a Python script to analyze Minecraft levels and render a > > > graph. Then I did the same with Clojure. It takes Python 10 seconds to > > > analyze a map, while it takes Clojure over a minute. > > > > After having tried different options without any significant improvement, > > > I am lost as to why there is such a huge difference. I wouldn't mind an > > > extra pair of eyes/brains to look at this. > > > > I blogged about it in more detail > > > here:http://pepijndevos.nl/clojure-versus-python > > > Clojure version:https://github.com/pepijndevos/Clomian/ > > > Python version:https://github.com/l0b0/mian > > > > Clojure spends most of its time in the freqs function, here are a couple > > > of variations:https://gist.github.com/663096 > > > > If you want to run the code yourself, you'll need a Minecraft level and > > > JNBT, which is not on Maven. > > > JNBT:http://jnbt.sourceforge.net/ > > > The level used in the blogpost:http://dl.dropbox.com/u/10094764/World2.zip > > > Can you check GC activity in the clojure version? > > > I once ran into an issue where Python was running rings around an > > Eiffel version (compiled down to native code - no VM need apply). This > > looks similar to what you have, in that I built a large data > > structure, and then started groveling over it. Turned out that Eiffel > > was doing a mark-and-sweep GC, which was spending all of it's time > > marking and sweeping the large static data structure, whereas python > > doing a reference count GC didn't. Given that I know nothing about > > Java GCs, this is just a WAG. > > > Come to think of it, how about trying to run the program Jython? That > > should have the same GC issues. If it's some similar environmental > > problem, that would show up there as well. > > > <mike > > -- > > Mike Meyer <m...@mired.org> http://www.mired.org/consulting.html > > Independent Network/Unix/Perforce consultant, email for more information. > > > O< ascii ribbon campaign - stop html mail -www.asciiribbon.org -- 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
