Le 30 sept. 2013 à 18:54, Les Mikesell <lesmikes...@gmail.com> a écrit :
> On Mon, Sep 30, 2013 at 5:32 AM, Fabrice Bacchella > <fbacche...@spamcop.net> wrote: >> >> I kept FILE as the backend, I agree that NIO is too heavy on memory. >> >> >> What symptoms do you have of NIO weightiness? I've struggled with NIO, too, >> and just wonder what you are seeing. Perhaps I missed something in the >> scroll back on this thread, sorry. >> >> >> I think the problems is in the read ahead policy on linux, that load page in >> chunk of mega bytes, just for a simple update of a few bytes. When you have >> a lot of rrd collected, it files the memory in a blink and you get too much >> swap in/swap out for real data. Switching from NIO to FILE decreased >> dramaticaly my IO load. > > Whether that is good or bad should depend on how much RAM you have > available for buffering - and RAM is pretty cheap these days. How > much does your system have besides what you give to the JVM? I have 42 GB of rrd in 12154 files, all of them are updated every 5 minutes. I think there is better usage of so much data than caching useless data. Especially if the solution is no-loose and no-cost choice. ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Please read the OpenNMS Mailing List FAQ: http://www.opennms.org/index.php/Mailing_List_FAQ opennms-devel mailing list To *unsubscribe* or change your subscription options, see the bottom of this page: https://lists.sourceforge.net/lists/listinfo/opennms-devel
