Thanks. JVisualVM shows the initial memory usage is a couple hundred MB, then decreases to levels about what you described. I'm using a 64-bit Java with the -server option to increase the max heap size.
But in my actual application, the memory performance is much worse: the heap size keeps growing until it gets up to about 1000MB (and unlike the previous example, actually uses most of that space). Once it hits about 1000MB, instead of running GC once every couple of seconds, it runs GC almost constantly, causing my application to basically freeze. (Since the application is a game, any long-running GC is a problem.) Here is a screenshot from JVisualVM. In the CPU graph, you can see the purple spikes are where global GCs happen. At first, they happen occasionally, but at the end, GC is running frequently and repeatedly. http://imgur.com/fNFOr.png Of course, my application is much more complex than the previous example, and it's entirely possible I'm missing some sort of leak in my code. But at the core of the program, I'm just using a tree of nested maps and references, so theoretically they should have similar performance characteristics. Thanks again. Any further help would be appreciated. On Oct 3, 1:24 am, hoeck <i_am_wea...@kittymail.com> wrote: > Hi, > > to measure memory requirements of java programs, it is better use a > tool like jvisualvm. The JVM process aquires memory as it needs > according to its max heap and max permgen settings. > I ran your little snippet on my machine with java -Xmx5M -jar > clojure.jar, and > while jvisualvm reported around 2M heap usage (like a bare clojure > REPL), top showed a memory usage of about 25 Megabytes. > > The default max heapsize is, at least on my machine with a 32bit JVM, > at around 128M, and lots of it will be allocated up front, regardless > how > much heap the running java programm needs. > > Erik --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
