[rules-users] addKnowledgePackages Delay

[Rajnikant Gupta]

As I said earlier It *may* or *may not* be relevant in your case. Usually
caching improves performance significantly in drools.

 In case of our application it does so by a very significant factor.

Regards,

Rajnikant Gupta
http://rkthinks.wordpress.com/


2010/5/3 Moe Alkhafaji <moe.alkhafaji at medcpu.com>

>  Hmmm, so you are suggesting I keep caches all possible combinations of
> KnowledgePackages? If I have 100 possible KnowledgePackages and they are
> loaded and unloaded dynamically that means I will have to have 100 choose n
> where n goes from 1 to 100. That will make me go out of memory easy no?
>
> Thanks.
>
> Sent from my iPhone
>
> On May 3, 2010, at 2:07 AM, Rajnikant Gupta <capricorn.raj at gmail.com>
> wrote:
>
>   It may look something like this:
>
> Map *knowledgeBaseCacheMap* = new HashMap();
>
> this.knowledgeBase = knowledgeBaseCacheMap.get("<SOME_IDENTIFIER>");
>
> if(this.knowledgeBase == null){
>    this.knowledgeBase.addKnowledgePackages(packages);
>    *knowledgeBaseCacheMap.put("<SOME_IDENTIFIER>", this.knowledgeBase)*
> }
>
> By doing this the packages get added to the knowledgeBase only for the
> first time. From second request onwards you get the same knowledgeBase each
> time without the need for adding the packages again.
>
> But this is valid only if you are not changing your rules. If your rules
> are changing from time to time, you may have to look at caching at more
> lower levels.
>
> I am not sure whether this can be helpful in your case but this is often
> helpful.
>
>
> Regards,
>
> Rajnikant Gupta
> http://rkthinks.wordpress.com/
>
>
> 2010/5/3 Moe Alkhafaji <moe.alkhafaji at medcpu.com>
>
>>  Thanks for the reply. But I don't understand what you mean by caching
>> the KnowledgeBase. This is about adding a pre compiled KnowledgePackage to a
>> KnowledgeBase. So, how does caching a KnowledgeBase makes addition of new
>> KnowledgePackage faster? Please excuse my ignorance if I am not catching
>> what you are suggesting. Maybe a couple of lines of code to demonstrate your
>> suggestion would be greatly appreciated. Thanks.
>>
>> Sent from my iPhone
>>
>> On May 3, 2010, at 1:24 AM, Rajnikant Gupta <capricorn.raj at gmail.com>
>> wrote:
>>
>>   Hi,
>>
>> Yes, adding packages to knowledgeBase does take some time. You can
>> probably try caching your knowledgeBase. By doing this all, but first,
>> requests should be significantly fast.
>>
>>
>>
>>
>> Regards,
>>
>> Rajnikant Gupta
>>
>> <http://rkthinks.wordpress.com/>http://rkthinks.wordpress.com/
>>
>>
>> On Mon, May 3, 2010 at 11:36 AM, malkhafaji < <moe.alkhafaji at medcpu.com>
>> moe.alkhafaji at medcpu.com> wrote:
>>
>>>
>>> Hello,
>>>
>>> I am trying to add knowledge packages to an existing KnowledgeBase. My
>>> largest DRL file has 110 rules. I noticed that it may take up to 5
>>> seconds
>>> just to execute the following statement:
>>>
>>> this.knowledgeBase.addKnowledgePackages(packages);
>>>
>>> where "packages" is just a list of one knowledge package representing one
>>> drl. The nature of my rules is that I initially load a small set of rules
>>> and then at runtime my rules may load other DRLs. The problem is each DRL
>>> loading command (this.knowledgeBase.addKnowledgePackages(packages)) takes
>>> a
>>> few seconds and I have no idea why. Although, all those DRLs are already
>>> compiled (at startup time). It is the line I pasted above that takes the
>>> longest time out of anything else I do.
>>>
>>> Any idea why just merely adding a KnowledgePackage list to a
>>> KnowledgeBase
>>> can take this much time? Do you guys have any suggestions on how I can
>>> reduce this time? I tried to create another dummy KnowledgeBase and get
>>> the
>>> KnowledgePackage from it at runtime and add that to my KnowedgeBase above
>>> (thinking that would reduce the time maybe), but not at all.
>>>
>>> Any ideas would be great. The API does not have much info on what that
>>> add
>>> method exactly does behind the scenes, and how I can get around the long
>>> delays. This is very frustrating to me, and I am not sure where to look.
>>> Thanks for ANY help at all.
>>> --
>>> View this message in context:
>>> <http://drools-java-rules-engine.46999.n3.nabble.com/addKnowledgePackages-Delay-tp772574p772574.html>
>>> http://drools-java-rules-engine.46999.n3.nabble.com/addKnowledgePackages-Delay-tp772574p772574.html
>>> Sent from the Drools - User mailing list archive at Nabble.com<http://nabble.com/><http://nabble.com/>
>>> .
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