Mark,

Thanks for your reply.

We have been testing against  5.5.0.Final  and  we faced some problems .
One of the problem was that we had a quick fix  to mvel component from redhat guys (with their good will )to one of the critical  concurrency issues we faced .But it seems that fix is not  part of these community releases and there has been changes to mvel after that change.

Is there a way that we can make  the same permgen  fix to the 5.4.0.Final codebase?.
Or
Is this possible to get the concurrency  fix  these newer versions?.


Thanks and regards,
Adarsh CHAINI
SENIOR LEAD DEVELOPMENT SPECIALIST | HSBC Bank Plc
8 Canada Square, London E14 5HQ, UK
_______________________________________________

Phone Int: (0)79914720 Ext: +44 (0)20 79914720
Mobile +44(0)7595530105
Email adarsh.chaini@hsbcib.com


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Protect our environment - please only print this if you have to!




From: Mark Proctor <mproctor@codehaus.org>
To: Rules Users List <rules-users@lists.jboss.org>
Date: 15/01/2014 21:05
Subject: Re: [rules-users] permgen leak
Sent by: rules-users-bounces@lists.jboss.org




why not just update to 5.6, it’s fixed there.
http://downloads.jboss.org/drools/release/5.6.0.Final/

You can specify dialect at the top of the drl file, to be applied to all rules in that file. But that’s about it.

Mark
On 15 Jan 2014, at 20:51, adarsh.chaini@hsbcib.com wrote:

Is this possible to set everything to MVEL Dialect as we are using  JavaDialect  in all our rules.
We had this few times before and we managed to avoid it with usage of CMSClassUnlaoadingEnabled .
But this has again comeback recently because the rate at which the classes are produced with load,CMS is unable to collect  the permgen space at same rate so it trips

Thanks and regards,

Adarsh CHAINI
SENIOR LEAD DEVELOPMENT SPECIALIST | HSBC Bank Plc
8 Canada Square, London E14 5HQ, UK
_______________________________________________

Phone Int: (0)79914720 Ext: +44 (0)20 79914720
Mobile +44(0)7595530105
Email adarsh.chaini@hsbcib.com



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Protect our environment - please only print this if you have to!
From: Mark Proctor <mproctor@codehaus.org>
To: Rules Users List <rules-users@lists.jboss.org>
Date: 15/01/2014 18:27
Subject: Re: [rules-users] permgen leak
Sent by: rules-users-bounces@lists.jboss.org



You can try setting everything to the MVEL dialect, and also forcing MVEL to reflection via the system property (turning off jit)
http://mvel.codehaus.org/Disabling+the+JIT+Compiler

Mark
On 15 Jan 2014, at 18:23, adarsh.chaini@hsbcib.com wrote:

Hi Mark/Davide

Is there a work around to this problem in 5.4?.


Thanks and regards,

Adarsh CHAINI
SENIOR LEAD DEVELOPMENT SPECIALIST | HSBC Bank Plc
8 Canada Square, London E14 5HQ, UK
_______________________________________________

Phone Int: (0)79914720 Ext: +44 (0)20 79914720
Mobile +44(0)7595530105
Email adarsh.chaini@hsbcib.com




_______________________________________________
Protect our environment - please only print this if you have to!
From: Mark Proctor <mproctor@codehaus.org>
To: Rules Users List <rules-users@lists.jboss.org>
Date: 08/01/2014 04:46
Subject: Re: [rules-users] permgen leak
Sent by: rules-users-bounces@lists.jboss.org



For anyone interested. The commit involves addressing two needs.
1) Enforcing MVEL reflection mode throughout - MVEL ASM optimiser can NEVER be used for anything (it doesn’t add much value anyway).
2) Avoiding giving the template system the root class loader(which we use for dynamic stuff), as those templates are statically cached.
https://github.com/sotty/drools/commit/1b75d4785861e72338cc5ea1280610a7937be017

Mark
On 8 Jan 2014, at 00:53, Mark Proctor <mproctor@codehaus.org> wrote:

> The root of the perm gen leak has now be solved,  thanks to some heroic work by community developer Davide Sottara.
>
> This is just in time for the 5.6 release going out this week. You will not need to use the kbase.dispose() work around.
>
> Mark
> On 6 Jan 2014, at 20:50, Mark Proctor <mproctor@codehaus.org> wrote:
>
>> The 5.6 approach should be considered a work around, not a fix. Somewhere a ref is being held, that shouldn’t be - we just haven’t found it yet.
>>
>> Mark
>>
>> On 6 Jan 2014, at 19:17, Davide Sottara <dsotty@gmail.com> wrote:
>>
>>> I have run pmander's tests, and reported in a previous email.
>>> The leak in 5.x is due to the nature of the composite classloader, and
>>> dispose()
>>> forces the memory to be released. I don't remember if that fix was in
>>> 5.6.CR1
>>> (probably not), so you may have to try 5.6.0-SNAPSHOT or wait for the
>>> end of the week.
>>> 6.x does not suffer from the same problem, but has a different issue -
>>> no way
>>> to unload kie modules once they are cached - which Mario has been
>>> working on.
>>> In either case, pmander's test works fine in both 5.6.x and 6.x after
>>> these fixes
>>> Davide
>>>
>>> On 01/06/2014 07:56 PM, Mark Proctor wrote:
>>>> I’ve been  told 5.6 will be released this week. This is because the JCR2GIT migration tool, in 5.6 is needed for our 6.0 product.
>>>>
>>>> Davide's current kbase.dispose() method, on the concrete class, should just be considered a work around for the problem. Unless this is fixed by someone in the community, I don’t think any core developers will have time to address this. At least not for 5.x; we’ll continue to look into it for 6.x.
>>>>
>>>> Mark
>>>>
>>>>
>>>> On 6 Jan 2014, at 16:14, brachi <brachi.w@sapiens.com> wrote:
>>>>
>>>>> see previous messages, pmander attached a unit test
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> View this message in context: http://drools.46999.n3.nabble.com/permgen-leak-tp4027038p4027539.html
>>>>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>>>>> _______________________________________________
>>>>> rules-users mailing list
>>>>> rules-users@lists.jboss.org
>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users@lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users@lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>


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Registered Office: 8 Canada Square, London E14 5HQ, United Kingdom
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Registered in England - Number 14259
Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority
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HSBC Bank plc may be solicited in the course of its placement efforts for a new issue, by investment clients of the firm for whom the Bank as a firm already provides other services. It may equally decide to allocate to its own proprietary book or with an associate of HSBC Group. This represents a potential conflict of interest. HSBC Bank plc has internal arrangements designed to ensure that the firm would give unbiased and full advice to the corporate finance client about the valuation and pricing of the offering as well as internal systems, controls and procedures to identify and manage conflicts of interest.

HSBC Bank plc
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Registered in England - Number 14259
Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority
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 ----------------------------------------- SAVE PAPER - THINK BEFORE YOU PRINT! This transmission has been issued by a member of the HSBC Group "HSBC" for the information of the addressee only and should not be reproduced and/or distributed to any other person. Each page attached hereto must be read in conjunction with any disclaimer which forms part of it. Unless otherwise stated, this transmission is neither an offer nor the solicitation of an offer to sell or purchase any investment. Its contents are based on information obtained from sources believed to be reliable but HSBC makes no representation and accepts no responsibility or liability as to its completeness or accuracy.