If one is using an FSDirectory to perform searches while the first search would be slow, remaining searches would be fast since Linux will now buffer the index in RAM.
The RAMDirectory has the advantage of pre-loading everything and can keep it in memory if the box is performing other operations.
In my benchmarks though RAMDirectory is slightly slower. I assume this is because its Hashtable based even though it only needs to be synchronized in a few places. IE searches should never be synchronized...
Would a HashMap implementation of RAMDirectory beat out a cached FSDirectory?
Kevin
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