IdentityMap limits

I am trying to do a performance test. I have 3 servers running with 16 GB of memory (toplink 10.1.3) applications. A large database and a slew of zombie for loadtesting computers. I'm trying to figure out how to make our request to go faster.

I used HardCacheWeakIdentityMaps, SoftCacheWeakIdentityMap and WeakIdentityMap. All those who seem to leave cards of identity to achieve extreme sizes. When the size of the map gets about 50 000 things begin to slow down. It becomes "very slow" when ID cards exceed 250 000 objects. I put the descriptor to use 'setIdentityMapSize' to 10,000, but he seems to ignore this limit. Is there another setting I need to use?

If I use 'useCacheIdentityMap' and the card remains in the limit of 10,000. The application seems to work faster, but everything I read says not to use the CacheIdentityMap.

The problem seems to be related to problems of concurrency within the identity cards. I even added a CacheInvalidation policy due to expire objects ever 5 seconds - still not very large maps. The only thing that seems to help, in addition to the uses a cacheidentityMap, is to clear the identity cards, initializeAllIdentityMaps(), every 90 seconds.

The application did a lot of reading and writing.

Hello

Object identity makes them using a two-way relationship for example, by reading directly in the object or who cross the relationship will give you the same instance of the object. That is to say a == a.getB () .getA (). As Doug mentioned, using a cacheIdentityMap does not ensure object identity is preserved, there is always a chance that one! = a.getB () .getA (). This means different things for different applications, but can also mean increased memory usage since, in the simple a.getB () .getA ()! = an example, the object tree refers to two instances of object instead of one.

I'm not sure that the CacheIdentityMap will help. Because SoftCacheWeakIdentityMap uses a similar cache under, then keeps the weak references to everything else, he does not much different - as long as a root of the tree is in the cache, the tree cannot be reclaimed by garbage collection. Weak references used in the identitymap will not prevent objects to be collected. Tune the game cache to reduce the number of objects that he keeps as necessary would help a lot more.

If you are not already, I advise you to use indirection wherever possible. In more complex object models, I have seen that not every relationship is a mapping object reference. For example, you might be able to simply store the foreign key in a direct mapping of fields, and when the reference object is necessary the session allows you to look up.

Best regards
Chris

Tags: Fusion Middleware

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