EhCache and JCS throws Out of Memory error.

[Domendra Markam]

I was trying to evaluate JCS and EhCache . I need to store approx 1 to 2 M instances in the cache. Which can be shared across other JVMs . EhCache throws OutOfMemory error for more than 0.4 M instances. This is the same case with JCS. I have configured disk store for both of them.

Is anyone has faced this issue earlier. I am not sure if there is any limitation on the number of instances. Please suggest?

EhCahce configuration.

<cache name="testCache"
maxElementsInMemory="100"
maxElementsOnDisk="2000000"
eternal="false"
overflowToDisk="true"
diskSpoolBufferSizeMB="20"
diskPersistent="true"
timeToIdleSeconds="300"
timeToLiveSeconds="600"
memoryStoreEvictionPolicy="LFU"
/>

JCS configuration

#jcs.region.testCache1=DC,LTCP
jcs.region.testCache1=DC
jcs.region.testCache1.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.region.testCache1.cacheattributes.MaxObjects=100
jcs.region.testCache1.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.region.testCache1.cacheattributes.UseMemoryShrinker=true
jcs.region.testCache1.cacheattributes.MaxMemoryIdleTimeSeconds=3600
jcs.region.testCache1.cacheattributes.ShrinkerIntervalSeconds=600
jcs.region.testCache1.cacheattributes.MaxSpoolPerRun=500
jcs.region.testCache1.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.region.testCache1.elementattributes.IsEternal=true
jcs.region.testCache1.elementattributes.IsSpool=true
jcs.region.testCache1.elementattributes.DiskUsagePattern=UPDATE



# AVAILABLE AUXILIARY CACHES
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=Data
jcs.auxiliary.DC.attributes.maxKeySize=2000000
jcs.auxiliary.DC.attributes.MaxPurgatorySize=10000
jcs.auxiliary.DC.attributes.OptimizeAtRemoveCount=300000
jcs.auxiliary.DC.attributes.OptimizeOnShutdown=true
jcs.auxiliary.DC.attributes.MaxRecycleBinSize=7500
jcs.auxiliary.DC.attributes.EventQueueType=POOLED
jcs.auxiliary.DC.attributes.EventQueuePoolName=disk_cache_event_queue


# Disk Cache pool
thread_pool.disk_cache_event_queue.boundarySize=50
thread_pool.disk_cache_event_queue.useBoundary=true
thread_pool.disk_cache_event_queue.maximumPoolSize=15
thread_pool.disk_cache_event_queue.minimumPoolSize=1
thread_pool.disk_cache_event_queue.keepAliveTime=3500
thread_pool.disk_cache_event_queue.startUpSize=1