If it is a memory / gc problem, the easiest way to spot it is writing a gc log.
Add the following parameters to your JVM parameters: -Xloggc:D:/log/myGClog.log -XX:+PrintGCDetails Then, use a GC log viewer to keep a look on the logs (by refreshing or tail refresh) with a GC log viewer. These will show you heap usage and GC pause timings GCviewer <https://github.com/chewiebug/GCViewer> or HP Jmeter<https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=HPJMETER>are pretty useful. I prefer HP Jmeter although it might need some logfile wrangling because of some unlogical newlines in the Oracle JVM logs. Usually replacing \n: with : does the trick if it gives an 'insane data' error. On Saturday, October 13, 2012 7:14:43 PM UTC+2, Mark wrote: > > This feels like a memory leak problem. Try adding > -XX:-HeapDumpOnOutOfMemoryError. You might try lowering the max heap to > try and force an OOM earlier. Heap dumps can be analyzed using a variety > of tools. My favorite is eclipse.org/mat > > On Saturday, October 13, 2012 8:16:54 AM UTC-7, Jim foo.bar wrote: >> >> On 13/10/12 12:55, Jim - FooBar(); wrote: >> > On 13/10/12 12:50, Tassilo Horn wrote: >> >> pmap might not be as perfect for you use-case as you think. Because >> it >> >> is lazy and chunked, it won't keep you cores busy. Some time ago, >> there >> >> was a detailed thread about this on this list. >> > >> > But it does keep my cores fully busy (99-100%) for the first 40 min >> > roughly...IT is only after that that things go downhill... garbage >> > collection issues sound more plausible to me...I'm about to try the >> > new G1 collector and also since I'm doing string processing I'll try >> > "-XX:+OptimizeStringConcat" and potentially >> > "-XX:+UseCompressedStrings" (as long as the speed penalty is not that >> > big)... >> > >> > >> > Jim >> >> I switched from pmap to >> >> (r/fold n (r/monoid into vector) conj coll)) >> >> and the same thing happened again! >> after approximately 50 minutes cpu utilisation dropped from 4/4 to >> 1/4...I don't understand! >> >> Jim >> > -- 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
