[OFBiz] Users - OFBIZ Cache Tuning in base/config/cache.properties

[mpf at zentric.com]

Hi again on this issue,

I reseached over the available documentation again (last time in march 2005
) but didnt find any news. So this is another attemp to get a better
understanding.

Existing Info I found:
Wiki: http://ofbizwiki1.go-integral.com/Wiki.jsp?page=CacheSettings
ProductionSetupguide:
http://www.undersunconsulting.com/static/OFBizBasicProductionSetup.pdf

There is not much detail in those documents. They both pretty much say:  Do
it in the cache.properties :-)

I think all ofbiz admins need more detail on it. Thats why I specify the
questions more detailed and would appreceate if anybody would post a
example fine-tuned cache.properties file

All Feedback and hints will be compiled by me and added to the wiki/faq

So here are my questions
1. Question: What is the Flag "useSoftreference" for? What does true and
false do?
2. Question: What  unit is "maxSize" and what if it is left empty in the
cache.propery?


3.Question: What exactly do the per-delegator Entity Engine cache settings
tune?
#Examples for per-delegator Entity Engine cache settings
#entitycache.entity-list.default.ProductPriceRule.expireTime=0
#entitycache.entity-list.default.ProductPriceRule.useSoftReference=true

4. On the Cache Maintenance Page I finde entriey like
"entitycache.entity.default.XXXX" and "entitycache.entity-list.default.
XXXXX". What is the difference betwen those?
And why is there no entry in the cache.properties for
entitycache.entity.default.XXXX entries?
Where do I create those entitycache.entity.default.XXXX entries
5. Questions regarding the Cache Maintenance Page
I cleared the cache and afterwards I montitored the caches (I hope the
formating with tabs is visibel too you)

Cache Name                                      size        hitCount
missCount   maxSize     expireTime  useSoftRef?
a) entitycache.entity-list.default.ProductCategoryMember    9,822
7,992             54,072      20,000      86,400,000  true
b) entitycache.entity-list.default.ProductPriceAction             52
2,180             2,736             3,000             86,400,000
true
c) entitycache.entity-list.default.ProductPriceCond         109
56,733      59,239      70,000      86,400,000  true

On a) With cache the missCount was allmost emmidiatly at 54000 the hitCount
and size slowly crow. My question now is: Why isnt the size 20000 after
54000 misses? TheProdukctCategoryMember is ideal for caching.
On b and c) since cache clearing the cachehit count is growing almost
linear with the misscount! Why? Those tables are suppossed to be queried
every almost every shop hit and the tables are static! So I would expect
the missCount to be growing very slowly and the hitCount to grow very fast.

6. Qustion: What other tuning for the cache.properties tips are there?
Answer from
http://www.undersunconsulting.com/static/OFBizBasicProductionSetup.pdf
${ofbiz insall dir}/base/config/cache.properties
Fresh from SVN, this file is configured to be development friendly to
reload
resources frequently. For production use the expire times for the caches in
the last
section of the file should all be commented out by putting a pound sign “#”
at the
beginning of each line. The properties in question start with “minilang.”,
“script.”,
“webapp.”, “widget.” And “template.”.

Bye
Michael
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