Posted by
Firas A.-2 on
Oct 21, 2005; 12:06pm
URL: http://ofbiz.116.s1.nabble.com/OFBiz-Users-OFBIZ-Cache-Tuning-in-base-config-cache-properties-tp136154p136155.html
Hi,
Better late than never. Answers to some of your questions. I'm too is
interested in more info on this subject.
Q1: What is the Flag "useSoftreference" for?
A1: The useSoftReference property is used to specify whether soft references
should be used for cache entries. Soft references help keep large caches
from taking
too much memory by allowing the garbage collector to clear these entries
when more memory is needed. Possible values: true/false.
Q2: Question: What unit is "maxSize"...?
A2: Specifies the maximum number of entries in the cache.
Regards,
</Firas>
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Sent: den 17 oktober 2005 11:43
To: OFBiz Users / Usage Discussion
Subject: [OFBiz] Users - OFBIZ Cache Tuning in base/config/cache.properties
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=CacheSettingsProductionSetupguide:
http://www.undersunconsulting.com/static/OFBizBasicProductionSetup.pdfThere 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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