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From: Marcel Offermans <marcel.offermans@luminis.eu>
To: "dev@felix.apache.org" <dev@felix.apache.org>
Subject: RE: Java process codepage sharing
Thread-Topic: Java process codepage sharing
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Date: Fri, 25 Jul 2014 14:16:13 +0000
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You might want to try and contact Jan Rellermeyer about this. Last time I t=
alked to him at an OSGi meeting he was looking into doing multi-tenancy bas=
ed on codepage sharing. He might have further insights into this.=0A=
=0A=
Greetings, Marcel=0A=
=0A=
________________________________________=0A=
From: Rob Walker <robw@ascert.com>=0A=
Sent: Friday, July 25, 2014 3:35 PM=0A=
To: dev@felix.apache.org=0A=
Subject: Re: Java process codepage sharing=0A=
=0A=
On 25/07/2014 15:20, Richard S. Hall wrote:=0A=
> On 7/25/14, 08:45 , Rob Walker wrote:=0A=
>> I'm being lazy here, but didn't find a quick answer via Google.=0A=
>>=0A=
>> I have it in the back of my mind that the Java VM has some kind of=0A=
>> codepage sharing i.e. 2 java process running the same code on the=0A=
>> same machine will only use one memory space for the loaded class=0A=
>> bytecode. Each will have it's own data pages clearly.=0A=
>>=0A=
>> 1st question is - am I correct on this?=0A=
>>=0A=
>> If this is true it leads to my 2nd question - whether Felix/OSGi=0A=
>> defeats? I'm assuming that any codepage sharing done by the VM would=0A=
>> be based on the absolute path to the JAR, and hence in an OSGi model=0A=
>> where we have a bundle cache per-process, the codepages may not end=0A=
>> up shared?=0A=
>=0A=
> I thought they only memory mapped the JRE classes, not application=0A=
> classes...=0A=
>=0A=
That could be what I'm thinking of!=0A=
=0A=
Be interesting to know if they do go beyond that=0A=
=0A=
> -> richard=0A=
>=0A=
>>=0A=
>>=0A=
>> Feel free to respond with links to article I need to go read!=0A=
>>=0A=
>> -- Rob=0A=
>>=0A=
>>=0A=
>> Ascert - Taking systems to the edge=0A=
>> robw@ascert.com=0A=
>> SA +27 21 300 2028=0A=
>> UK +44 20 7488 3470 ext 5119=0A=
>> www.ascert.com=0A=
>>=0A=
>=0A=
=0A=
--=0A=
=0A=
=0A=
Ascert - Taking systems to the edge=0A=
robw@ascert.com=0A=
SA +27 21 300 2028=0A=
UK +44 20 7488 3470 ext 5119=0A=
www.ascert.com=0A=
=0A=