I recognize the requirement, but I happily run Fedora over other HotSpot-variants in development. My point is only that we would ideally _not_ require a particular VM, although I also recognize that we require a certain level of predictability for good support.
Those options are exactly the ones to which I was referring. They work perfectly well in our experience, but we have _not_ done real, formal testing. This might be very worthwhile. --- A. Soroka Online Library Environment the University of Virginia Library On Jul 25, 2011, at 3:52 PM, Chris Wilper wrote: > Currently we do require the Sun/Oracle version of Java 6, so the > settings should be consistent across VMs. > > Incidently, are you familiar with CMSClassUnloadingEnabled and > UseConcMarkSweepGC? Apparently both are required to get the Sun/Oracle > VM to attempt to unload old classes. > > But I'm hesitant to recommend much without the actual tuning experience. > > - Chris > > On Mon, Jul 25, 2011 at 11:30 AM, <aj...@virginia.edu> wrote: >> This is even more relevant for those sites which are running a repository in >> the same container as other applications (which may be hungry for PermGen >> themselves). >> >> I've never seen the behavior that a repository starts up fine but eventually >> runs out of PermGen, which suggests against a memory leak, to me. I have >> many times seen a repository in a container with other apps fail to get up >> and running very quickly after JVM startup with PermGen problems. My >> experience has been that Fedora simply had a large appetite for classes and >> that appetite is fairly constant. >> >> We might also consider offering advice (but this would get pretty >> JVM-specific) about setting class unloading behavior. >> >> --- >> A. Soroka >> Online Library Environment >> the University of Virginia Library >> >> >> >> >> On Jul 25, 2011, at 8:35 AM, Chris Wilper wrote: >> >>> While running ConfigB tests on 3.5-SNAPSHOT with Oracle on Windows 7 >>> x64 last week, the embedded Tomcat gave me the dreaded >>> "OutOfMemoryError: PermGen Space". Has anyone else seen this yet when >>> running 3.5-SNAPSHOT? (particularly on 64-bit Windows or Linux) >>> >>> After looking into the problem a bit, I am coming around to the >>> conclusion that we should be recommending people set a maximum permgen >>> size to the VM (e.g. -XX:MaxPermSize=256m). >>> >>> Here's what I did after noticing the error: >>> >>> 1) Stopped tomcat and added the following line to >>> %FEDORA_HOME%\tomcat\bin\setclasspath.bat >>> >>> set JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8086 >>> -Dcom.sun.management.jmxremote.ssl=false >>> -Dcom.sun.management.jmxremote.authenticate=false -XX:MaxPermSize=256m >>> >>> 2) Started Tomcat and fired up VisualVM, adding the JMX Connection to port >>> 8086 >>> >>> 3) Ran mvn install -Dconfig=B and watched what it said about PermGen size. >>> >>> Here's what I noticed: >>> >>> Prior to the tests starting, PermGen was at about 54m with about 7200 >>> classes loaded. >>> After the tests ran for a few minutes, PermGen grew and seemed to >>> level out at about 98m with about 13500 classes loaded. >>> >>> It's quite possible we have a classloader leak somewhere. But even if >>> we don't, it seems we should be recommending a bigger MaxPermSize than >>> the default, 64m. >>> >>> - Chris >>> >>> ------------------------------------------------------------------------------ >>> Storage Efficiency Calculator >>> This modeling tool is based on patent-pending intellectual property that >>> has been used successfully in hundreds of IBM storage optimization engage- >>> ments, worldwide. Store less, Store more with what you own, Move data to >>> the right place. Try It Now! >>> http://www.accelacomm.com/jaw/sfnl/114/51427378/ >>> _______________________________________________ >>> Fedora-commons-developers mailing list >>> Fedora-commons-developers@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/fedora-commons-developers >> >> >> ------------------------------------------------------------------------------ >> Storage Efficiency Calculator >> This modeling tool is based on patent-pending intellectual property that >> has been used successfully in hundreds of IBM storage optimization engage- >> ments, worldwide. Store less, Store more with what you own, Move data to >> the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ >> _______________________________________________ >> Fedora-commons-developers mailing list >> Fedora-commons-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/fedora-commons-developers >> > > ------------------------------------------------------------------------------ > Storage Efficiency Calculator > This modeling tool is based on patent-pending intellectual property that > has been used successfully in hundreds of IBM storage optimization engage- > ments, worldwide. Store less, Store more with what you own, Move data to > the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ > _______________________________________________ > Fedora-commons-developers mailing list > Fedora-commons-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/fedora-commons-developers ------------------------------------------------------------------------------ Storage Efficiency Calculator This modeling tool is based on patent-pending intellectual property that has been used successfully in hundreds of IBM storage optimization engage- ments, worldwide. Store less, Store more with what you own, Move data to the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ _______________________________________________ Fedora-commons-developers mailing list Fedora-commons-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/fedora-commons-developers
