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From "Ron Zohar" <...@gmx.de>
Subject wrong key count in indexed key cache ??
Date Wed, 13 Feb 2008 09:48:54 GMT
Hello,

I am currently evaluation JCS.
I am adding 10.000.000 objects to the cache. On program exit and restart only approx 300.000
keys are written/read from the keys-file.
Is this a bug or do I have to change something in the configuration ?
I was expecting to use the disk cache as an (unreliable) object store, to be able to retrieve
all objects after restart of the JVM.

Further question: In case MaxPurgatorySize == 0, no objects are written to the disk cache.
I was expecting that objects will be written immediately to  disk.

Concerning the file: what do you think of using a memory mapped file. would that be more efficient
in case of large disk caches ?

# DEFAULT CACHE REGION
jcs.default=DC
jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.default.cacheattributes.MaxObjects=1000
jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.default.cacheattributes.UseMemoryShrinker=false
jcs.default.cacheattributes.MaxMemoryIdleTimeSeconds=3600
jcs.default.cacheattributes.ShrinkerIntervalSeconds=60
jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.default.elementattributes.IsEternal=false
jcs.default.elementattributes.MaxLifeSeconds=21600
jcs.default.elementattributes.IdleTime=1800
jcs.default.elementattributes.IsSpool=true
jcs.default.elementattributes.IsRemote=true
jcs.default.elementattributes.IsLateral=true


#Auxiliary CACHE (disk cache)
jcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
jcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
jcs.auxiliary.DC.attributes.DiskPath=e:\jcscache
jcs.auxiliary.DC.attributes.MaxKeySize=10000000
jcs.auxiliary.DC.attributes.MaxPurgatorySize=1000



jcs.region.testCache=DC
jcs.region.testCache.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.region.testCache.cacheattributes.MaxObjects=0
jcs.region.testCache.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.region.testCache.cacheattributes.UseMemoryShrinker=false
jcs.region.testCache.cacheattributes.DiskUsagePattern=UPDATE
jcs.region.testCache.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.region.testCache.elementattributes.IsEternal=true
jcs.region.testCache.elementattributes.MaxLifeSeconds=-1
jcs.region.testCache.elementattributes.IdleTime=-1
jcs.region.testCache.elementattributes.IsSpool=true
jcs.region.testCache.elementattributes.IsRemote=false
jcs.region.testCache.elementattributes.IsLateral=false


	            try
	            {
	                cache =  JCS.getInstance( cacheRegionName );
	            }
	            catch ( CacheException e )
	            {
	            	e.printStackTrace();
	            }
	            for (int i=0; i<10000000; i++)
	            {
	            City city = new City();
	            try
	            {
	                    cache.put( ""+i, city );
	            }
	            catch ( Exception e )
	            {
	            	e.printStackTrace();
	            }
	            if (i % 4000 == 0)
	            {
                    // yield so disk thread can get the cpu
            	    Thread.yield();
                    System.out.println(cache.getStats());
	            }
	            }


- Ron
http://sourceforge.net/projects/ajax4jmx/


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