I have been trying to profile a running node with queued requests and inserts. I have previously profiled nodes without queued requests/inserts, so I had assumed this would be possible. But it appears not to be. After many hours spent on this (mostly waiting for it to do something), it still doesn't work. So far:
Add to or change wrapper.conf: wrapper.java.additional.3=-Xloggc:freenet.loggc wrapper.java.additional.4=-Xrunhprof:heap=all,format=a,depth=12,lineno=y,doe=y,gc_okay=y wrapper.startup.timeout=0 wrapper.shutdown.timeout=0 wrapper.jvm_exit.timeout=0 wrapper.ping.timeout=0 wrapper.disable_restarts=true Add to or change freenet.ini: logger.priority=NORMAL node.disableHangCheckers=true (and remove any detailed log thresholds) The latest: [01:52] <toad_> i don't understand it [01:52] <toad_> everything i have done to try to get profiling to work while there are actual requests queued has been thwarted [01:52] <toad_> this is the latest: [01:52] <toad_> INFO | jvm 1 | 2007/02/16 01:28:33 | Dumping Java heap ... [01:52] <toad_> half an hour later, it's not using any CPU [01:52] <toad_> and apparently not doing anything [01:53] <toad_> but it hasn't dumped the heap [01:53] <toad_> nor has freenet resumed operations [01:53] <toad_> which is insane [01:54] <toad_> i don't think the right answer is not to address the problem, because if i can't get profiling data, how can i know whether doing XYZ to reduce memory usage will actually hit a significant part of the problem? [01:54] <toad_> you end up with complex code which doesn't actually help matters that way [01:57] <thatjoe> Is there a way to get an object (or byte) count by type? [01:59] <thatjoe> I wish I could be of help. I haven't done heavy-duty Java debugging in ages. If you want to port it to .NET I could help you track down memory problems, piece of cake! :) [01:59] <toad_> thatjoe: with jmap yes [01:59] <toad_> but that's not very helpful [01:59] <toad_> hprof lets you have detailed numbers on each backtrace [01:59] <toad_> which is VERY helpful [01:59] <toad_> but it's not working at all now [02:00] <toad_> also when i tried jmap <pid of java running fred> it didn't work :< -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: Digital signature URL: <https://emu.freenetproject.org/pipermail/devl/attachments/20070216/c15fc781/attachment.pgp>
