Hi Debasis, Yes the memory cache is very fast. Basically the way JCS behaves for us is that when we request data and it's located only on (say) the remote cache server, JCS fetches it automatically and copies it into local ram. Then next time we request it JCS returns it very quickly. We didn't need to configure this behaviour explicitly. We just found that when using the remote server, JCS copies data to local ram automatically, presumably for this reason (to speed things up).
I'd imaging that the lateral and disk caches would behave in a similar way and keep a copy of data in ram when accessed to speed retrievals up. You'll probably want to configure it such that a certain number of most recently (or frequently) used objects stay in local ram, but if they're not used then they are spooled out to disk. If they are subsequently needed again JCS can copy them back into ram (and spool out something else if necessary). I know JCS supports spooling like this but I've not used the disk cache. Also remember if you're testing retrieval speed that you should retrieve the same data number of times in your test, because the first retrieval might indeed be slow (due to remote/disk fetching) but subsequent retrievals should (if properly configured) be very fast. We store all static data in one region. For each type of static data we load all objects into a collection, and then put the collection in the StaticDataRegion as a single element. We store transient data objects of particular types directly in TransientDataRegionX, such that objects of the same type are stored in a region of their own, a unique key per object. We prefer to store transient data in the cache for a maximum fixed period of time (1 hour), such that it gets reloaded periodically if something got out of sync. Our cache.ccf file is quite simple: ----------------------------------------------- # # Default settings, specifying a local in-memory cache of max size 0 objects # to effectively prevent objects being stored in regions which are not configured explicitly. # # These settings will be inherited by any regions which do not provide their own settings # to override these settings, thus unconfigured regions will not store any objects. # jcs.default= jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.default.cacheattributes.MaxObjects=0 jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.default.cacheattributes.UseMemoryShrinker=false jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.default.elementattributes.IsEternal=false jcs.default.elementattributes.IsLateral=false jcs.default.elementattributes.IsRemote=false jcs.default.elementattributes.IsSpool=false # # Settings configuring an auxiliary cache located on a remote caching server. # (auxiliary as in addition to the built-in local memory cache) # jcs.auxiliary.remotecache=org.apache.jcs.auxiliary.remote.RemoteCacheFactory jcs.auxiliary.remotecache.attributes=org.apache.jcs.auxiliary.remote.RemoteCacheAttributes jcs.auxiliary.remotecache.attributes.FailoverServers=<ip removed>:1102 jcs.auxiliary.remotecache.attributes.GetOnly=false jcs.auxiliary.remotecache.attributes.Receive=true jcs.auxiliary.remotecache.attributes.RemoveUponRemotePut=true jcs.auxiliary.remotecache.attributes.RmiSocketFactoryTimeoutMillis=15000 # # Settings specifying a cache region of unlimited size on a remote cache server, # where objects stay in remote server memory permanently and are never evicted. # # Note that being a region on a remote cache server, the configuration file on the remote server will # actually take effect, but duplicating the same settings client-side is recommended. See JavaDoc # note on this in class JCSCacheConfigurationFileTemplate. # jcs.region.StaticDataRegion=remotecache jcs.region.StaticDataRegion.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.region.StaticDataRegion.cacheattributes.MaxObjects=2147483647 jcs.region.StaticDataRegion.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.region.StaticDataRegion.cacheattributes.UseMemoryShrinker=false jcs.region.StaticDataRegion.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.region.StaticDataRegion.elementattributes.MaxLifeSeconds=-1 jcs.region.StaticDataRegion.elementattributes.IsEternal=true jcs.region.StaticDataRegion.elementattributes.IsLateral=false jcs.region.StaticDataRegion.elementattributes.IsRemote=true jcs.region.StaticDataRegion.elementattributes.IsSpool=false # # Settings specifying a cache region of max size 10,000 objects on a remote cache server, # where objects stay in the remote server's memory for up to 60 minutes (3600 seconds), and the eviction # thread runs every 5 minutes. # # Note that being a region on a remote cache server, the configuration file on the remote server will # actually take effect, but duplicating the same settings client-side is recommended. See JavaDoc # note on this in class JCSCacheConfigurationFileTemplate. # jcs.region.TransientDataRegion1=remotecache jcs.region.TransientDataRegion1.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.region.TransientDataRegion1.cacheattributes.MaxObjects=10000 jcs.region.TransientDataRegion1.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.region.TransientDataRegion1.cacheattributes.UseMemoryShrinker=true jcs.region.TransientDataRegion1.cacheattributes.ShrinkerIntervalSeconds=300 jcs.region.TransientDataRegion1.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.region.TransientDataRegion1.elementattributes.MaxLifeSeconds=3600 jcs.region.TransientDataRegion1.elementattributes.IsEternal=false jcs.region.TransientDataRegion1.elementattributes.IsLateral=false jcs.region.TransientDataRegion1.elementattributes.IsRemote=true jcs.region.TransientDataRegion1.elementattributes.IsSpool=false # # Settings specifying a cache region of max size 10,000 objects on a remote cache server, # where objects stay in the remote server's memory for up to 60 minutes (3600 seconds), and the eviction # thread runs every 5 minutes. # # Note that being a region on a remote cache server, the configuration file on the remote server will # actually take effect, but duplicating the same settings client-side is recommended. See JavaDoc # note on this in class JCSCacheConfigurationFileTemplate. # jcs.region.TransientDataRegion2=remotecache jcs.region.TransientDataRegion2.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.region.TransientDataRegion2.cacheattributes.MaxObjects=10000 jcs.region.TransientDataRegion2.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.region.TransientDataRegion2.cacheattributes.UseMemoryShrinker=true jcs.region.TransientDataRegion2.cacheattributes.ShrinkerIntervalSeconds=300 jcs.region.TransientDataRegion2.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.region.TransientDataRegion2.elementattributes.MaxLifeSeconds=3600 jcs.region.TransientDataRegion2.elementattributes.IsEternal=false jcs.region.TransientDataRegion2.elementattributes.IsLateral=false jcs.region.TransientDataRegion2.elementattributes.IsRemote=true jcs.region.TransientDataRegion2.elementattributes.IsSpool=false (and so on for other transient regions we want to set up) ----------------------------------------------- Our remote cache.ccf is also quite simple: ----------------------------------------------- registry.port=1102 remote.cache.service.port=1103 # # Settings specifying a cache region of max size 10,000 objects on a remote cache server, # where objects stay in the remote server's memory for up to 60 minutes (3600 seconds), and the eviction # thread runs every 5 minutes. # # Note that being a region on a remote cache server, the configuration file on the remote server will # actually take effect, but duplicating the same settings client-side is recommended. See JavaDoc # note on this in class JCSCacheConfigurationFileTemplate. # jcs.default= jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.default.cacheattributes.MaxObjects=10000 jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.default.cacheattributes.UseMemoryShrinker=true jcs.default.cacheattributes.ShrinkerIntervalSeconds=300 jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.default.elementattributes.MaxLifeSeconds=3600 jcs.default.elementattributes.IsEternal=false jcs.default.elementattributes.IsLateral=false jcs.default.elementattributes.IsRemote=false jcs.default.elementattributes.IsSpool=false # # Settings specifying a cache region of unlimited size on a remote cache server, # where objects stay in remote server memory permanently and are never evicted. # # Note that being a region on a remote cache server, the configuration file on the remote server will # actually take effect, but duplicating the same settings client-side is recommended. See JavaDoc # note on this in class JCSCacheConfigurationFileTemplate. # jcs.region.StaticDataRegion= jcs.region.StaticDataRegion.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes jcs.region.StaticDataRegion.cacheattributes.MaxObjects=2147483647 jcs.region.StaticDataRegion.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.region.StaticDataRegion.cacheattributes.UseMemoryShrinker=false jcs.region.StaticDataRegion.elementattributes=org.apache.jcs.engine.ElementAttributes jcs.region.StaticDataRegion.elementattributes.MaxLifeSeconds=-1 jcs.region.StaticDataRegion.elementattributes.IsEternal=true jcs.region.StaticDataRegion.elementattributes.IsLateral=false jcs.region.StaticDataRegion.elementattributes.IsRemote=false jcs.region.StaticDataRegion.elementattributes.IsSpool=false ----------------------------------------------- Kind regards, Niall On Thu, 2008-05-15 at 13:03 -0700, Debasis Bhattacharyya wrote: > Hi, > > Thanks for the response. It was interesting. > I got two points: > First, memory cache is fast. > second: Lateral and disk cache can be slow depending upon usage of cached > objects. > > So, how to turn my program to use only memory cache? Should I make the > first few lines in the config file look like this and leave the rest > unchanged? > > jcs.default.cacheattributes= > org.apache.jcs.engine.CompositeCacheAttributes > jcs.default.cacheattributes.MaxObjects=1000 > jcs.default.cacheattributes.MemoryCacheName= > org.apache.jcs.engine.memory.lru.LRUMemoryCache > > Is that all I need to do? You know, I tried this and it is as slow as it > was.. > Another question regarding disk cache. I have given local path in the > config file and was assuming it would put something in that folder after > cache is oversized/ over it's given time. But it never put anything?? I think > I am missing something.. I read the intro in apache website. It's very brief. > Is ther any other source in the net? > > Thanks again. > >
