Linux Sun's JVM needs improvements

[Jim Cornette]

Edward Yang wrote:
> Jim Cornette wrote:
> 
>> Edward Yang wrote:
>>
>>> Gain Paolo Mureddu wrote:
>>>
>>>> Sam Varshavchik wrote:
>>>>
>>>>> Gain Paolo Mureddu writes:
>>>>>
>>>>>> Sun should really take care of thier JVM if they want to make Java 
>>>>>> succeed in *nix. Even their won JVM has many troubles running on 
>>>>>> their Solaris platform... So this is more a *nix in general issue 
>>>>>> than just Linux alone.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> I agree 100%.
>>>>>
>>>>> Unfortunately, it looks like you posted your message to the wrong 
>>>>> mailing list.  This is not the Sun Java mailing list.
>>>>>
>>>> This was actually a clean follow up to a series of posts about 
>>>> memory management in FC and Java came up, hence I forked the thread 
>>>> (too long, anyway) into this thread. So no, it is not the wrong list ;)
>>>>
>>> Okay, I want to add more about Sun's JVM performance.
>>>
>>> I have posted a message to Sun's forum about the memory footprint of 
>>> the JVM on FC3. Please visit 
>>> http://forum.java.sun.com/thread.jspa?threadID=590956 for the message.
>>>
>>>
>>
>> So if I understand this a bit, you are running Windows and then using 
>> Microsoft virtual machine to run Fedora, then running a java virtual 
>> machine and it is being a resource hog?
>>
>> Did you try to run RHL 8.0, then launch the microsoft virtual machine 
>> program through wine to launch Fedora and see if the memory resources 
>> are any better?
>>
>> Jim
>>
>>
> Sorry, I think there is some misunderstanding about virutal techonology.
> 
> In a virutal hardware box, the guest OS inside it does not know where it 
> is. It may be a litter or much slower than in a real hardware box, but 
> the memory footprint should never been any difference. That's why many 
> developers use Microsoft Virutal PC or VMWare to test there programs. 
> Think about it - you don't have to boot into another OS or go to another 
> computer that may be 50 meters far just to test a small problem of your 
> progarm!
> 
> So I think I I have FC3 installed in a real hardware box, the memory 
> footprint of the JVM will be the same.
> 
> 

You might try these tests using a real set of hardware. I did tests 
using Vmware to convert a legacy machine up to the latest. The test 
indicated that everything was fine.
I don't think that the virtual hardware is truely imitating real 
hardware in all aspects.
I would trust tests using real hardware more than tests on virtual 
machines. I have not had much trouble installing fedora on real 
machines, but too much using virtual machines.

Jim