On 23 Oct 2013, at 15:32, David Powell <djpow...@djpowell.net> wrote:
> When you say it is spending 99% of its time in PersistentHashSet.cons, is > that the time spent in just that method, or the time spent in that method and > the methods that it calls? The latter. > Given that (set ...) is one of the first things called by (solve..), and that > its contents are produced lazily by a for comprehension, if you are looking > at the total time spent in PersistentHashSet.assoc, then maybe that will be > particularly slow. Not that that solves the problem, but I was wondering if > PersistentHashSet.assoc might be a red herring. Ah - that's entirely plausible. I have basically no experience of profiling Clojure, or understanding the way in which laziness affects doing so (I suspect that it complicates things somewhat?). > Also, out of interest, are you using a sampling profiler, or an instrumenting > one? Sampling. > Sometimes the built-in hprof profiler is good for this sort of thing: > > java -Xrunhprof:cpu=times,depth=4 -Xmx2g -jar > target\chess-clojure-0.1.0-SNAPSHOT-standalone.jar > > - you can use either cpu=times for instrumenting, or cpu=samples for > sampling. > > It is nice because the depth parameter lets you find hotspots including a few > steps up the stacktrace (4 in this case). And you can use Ctrl-\ / > Ctrl-Break / SIG_QUIT to get it to dump the current stats while the program > is still running to see if some methods are getting worse over time. I've not used hprof before - I'll see if I can divine anything useful from it. Thanks. -- paul.butcher->msgCount++ Snetterton, Castle Combe, Cadwell Park... Who says I have a one track mind? http://www.paulbutcher.com/ LinkedIn: http://www.linkedin.com/in/paulbutcher MSN: p...@paulbutcher.com AIM: paulrabutcher Skype: paulrabutcher -- -- 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.
