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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