OpenJDK is one with which I've had no problems running Fedora, at least on
Linux. Some of the others were mixtures of Apache Harmony with other VMs. A few
of them worked well, others... not so much. {grin} Fedora, in fact, became
something of an acid test for me looking at alternatives to the Oracle product.
OpenJDK, I think, would be far and away the best candidate to add to the
testing rotation.
---
A. Soroka
Online Library Environment
the University of Virginia Library
On Jul 25, 2011, at 4:36 PM, Chris Wilper wrote:
> I'm curious -- which other VMs have you used successfully? I've
> wondered about OpenJDK myself...
>
> At any rate,I think it makes sense to at least document the specific
> settings of the currently-required VM. I'm game for having a list of
> VMs instead of a single required VM at some point (provided they're
> Java 6+). But I think if we're going to recommend any other VMs, we
> really should be testing with them as part of the dev/release cycle.
>
> - Chris
>
> On Mon, Jul 25, 2011 at 4:01 PM, <aj...@virginia.edu> wrote:
>> 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
>>
>
> ------------------------------------------------------------------------------
> 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
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