Otis Gospodnetic wrote:
For the Lucene book I wrote some test cases that compare FSDirectoryYes... I performed the same benchmark and in my situation RAMDirectory for searches was about 2% slower.
and RAMDirectory. What I found was that with certain settings
FSDirectory was almost as fast as RAMDirectory. Personally, I would
push FSDirectory and hope that the OS and the Filesystem do their share
of work and caching for me before looking for ways to optimize my code.
I'm willing to bet that it has to do with the fact that its a Hashtable and not a HashMap (which isn't synchronized).
Also adding a constructor for the term size could make loading a RAMDirectory faster since you could prevent rehash.
If you're on a modern machine your filesystme cache will end up buffering your disk anyway which I'm sure was happening in my situation.
Kevin
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