File status optimization.

I'm having a (relatively) large database (300 mb) with a low cache (4 mb), and when the database is getting slow, presumably due to cache shortage, i see the following stack trace most of the time:
java.io.UnixFileSystem.getBooleanAttributes0 (UnixFileSystem.java:-2)
java.io.UnixFileSystem.getBooleanAttributes (UnixFileSystem.java:228)
java.io.File.exists (File.java:702)
com.sleepycat.je.cleaner.UtilizationProfile.putFileSummary (UtilizationProfile.java:720)
com.sleepycat.je.cleaner.UtilizationProfile.flushFileSummary (UtilizationProfile.java:680)
com.sleepycat.je.cleaner.UtilizationTracker.evictMemory (UtilizationTracker.java:118)
com.sleepycat.je.evictor.Evictor.evictBatch (Evictor.java:302)
com.sleepycat.je.evictor.Evictor.doEvict (Evictor.java:246)
com.sleepycat.je.evictor.Evictor.doCriticalEviction (Evictor.java:271)
com.sleepycat.je.dbi.CursorImpl.close (CursorImpl.java:668)
com.sleepycat.je.Cursor.close (Cursor.java:252)
com.sleepycat.je.Database.deleteInternal (Database.java:519)
com.sleepycat.je.Database.delete (Database.java:405)
File.exists most probably uses the "stat" system call, and I happen to know from prior experience, that this is endeed a slow call, it might be two or three times slower than the "open" call.
Is it really necessary to poll the filesystem for file status information when the environment is already opened? Could it be an option perhaps, that Berkley should cache file existance?

Artem:
In our next patch release, we have the following bug fix. Are you doing deletes, as the description says? If this might explain your problem, please contact me at linda dot q dot lee @ the expected if you would like to try a pre-release which includes this fix.
7. Fixed a bug which could degrade the performance of cache eviction. The problem can only be seen by applications which execute Database.delete(), Cursor.delete(), Environment.deleteDatabase() or Environment.truncateDatabase(), and is very timing dependent. The symptom is thread dumps which show that the application is frequently executing the java.io.File.exists() call with this stack trace:
at java.io.File.exists(File.java:733)
at com.sleepycat.je.cleaner.UtilizationProfile.putFileSummary(UtilizationProfile.java:747)
at com.sleepycat.je.cleaner.UtilizationTracker.evictMemory(UtilizationTracker.java:118)
at com.sleepycat.je.evictor.Evictor.evictBatch(Evictor.java:313)
at com.sleepycat.je.evictor.Evictor.doEvict(Evictor.java:253)
[#15512]

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