On Wed, May 28, 2014 at 6:02 PM, Karel Gardas <[email protected]> wrote: > > Thomas, > > thanks for your fast response. My comments are below. > > > On 05/28/14 05:27 PM, Thomas Mortagne wrote: >> >> You are mixing several things here. It's not because you hit Out of >> memory errors that you have a memory leak, it can simply mean that you >> have a document cache too big for the memory you allocated for >> example. You can modify the documents cache size in xwiki.cfg. > > > I see two caches in that file: > > xwiki.store.cache > xwiki.render.cache > > both seems to be commented out. > > >> How much memory did you allocated ? XWiki is not a small beast and it >> require a minimum to work. See >> http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Performances#HMemory. > > > To prevent misunderstanding. I've not set any limit on memory etc. I just > simply use xwiki-enterprise-jetty-hsqldb-6.0.1.zip as distributed on > xwiki.org. This distro does have 512MB RAM cap which following your link > above should be good for medium installs.
Ok that explains it, this distribution is more for tests purpose and the entire database is in memory so indeed the more pages you add the more memory you take. > > The question is, if the value of caches above are commented out in > xwiki.cfg, then what are actual default values which are used in the > xwiki-enterprise-jetty-hsqldb-6.0.1.zip distro? Just to know from which > value I shall go lower... > > Thanks! > Karel > > >> >> On Wed, May 28, 2014 at 4:58 PM, Karel Gardas<[email protected]> >> wrote: >>> >>> >>> Folks, >>> >>> I'm testing kind of scalability of XWiki by simple benchmark which >>> creates N >>> pages in a loop (one page at a time, it's not parallel run!) and then >>> when >>> this loop finishes, it again in another loop gets all the pages from the >>> server (again serially, one page at the time). For page creation we're >>> using >>> REST API, for getting the pages we're using common browseable URL >>> (/xwiki/bin/view/...). >>> Now the problem is that if I try to attempt creation of 100k pages, then >>> I >>> hit Java's out of memory errors and server is unresponsive from that >>> time. >>> I've tested this on: >>> >>> - xwiki-jetty-hsql-6.0.0 >>> - xwiki-jetty-hsql-6.0.1 >>> - xwiki-tomcat7-pgsql -- debian xwiki packages running on top of debian >>> 7.5 >>> >>> Of course I know the way how to increase Java's memory space/heap space. >>> The >>> problem is that this will not help here. Simply if I do so and then >>> create >>> 100 millions of pages on one run I will still get to the same issue just >>> it'll take a lot longer. >>> >>> I've googled a bit for memoryleaks issues on Java and found an >>> interesting >>> recommendation to use parallel GC. So I've changed start_xwiki.sh to >>> include >>> -XX:+UseParallelGC in XWIKI_OPTS >>> >>> Anyway, the situation is still looking suspiciously. I've connected >>> JConsole >>> to the xwiki java process and overall view looks: >>> >>> https://app.box.com/s/udndu96pl2fvuz3igvor >>> >>> this is whole run overview, but perhaps even more clear is it on last 2 >>> hours view which is here: >>> >>> https://app.box.com/s/deuix33fzejra4uur941 >>> >>> Sidenote this all is from debugging xwiki-jetty-hsql-6.0.1 distro. >>> >>> Now, what worries me a lot is this bottom cap which is growing. You can >>> see >>> that clearly in Heap Memory Usage from 15:15. In CPU usage you can also >>> see >>> that around the same time the CPU consumption went up from ~15% to ~45% >>> >>> When I switch to Memory Tab in JConsole and click several times on >>> "Perform >>> GC" button, the bottom cap is still there and I cannot get lower in >>> memory >>> usage. With this going on I can also see server failing after some time >>> on >>> OOM error. >>> >>> Any help with this is highly appreciated here. >>> >>> Thanks! >>> Karel >>> _______________________________________________ >>> devs mailing list >>> [email protected] >>> http://lists.xwiki.org/mailman/listinfo/devs >> >> >> >> > > _______________________________________________ > devs mailing list > [email protected] > http://lists.xwiki.org/mailman/listinfo/devs -- Thomas Mortagne _______________________________________________ devs mailing list [email protected] http://lists.xwiki.org/mailman/listinfo/devs
