Does anyone know why I might not be seing a performance increase for multiple concurrent threads using my "FileChannelDirectory" ?
Are you using a RAID system? If the data is already cached in RAM, then the i/o calls may be so fast that concurrency doesn't make things noticeably faster. If the data is not already cached, then, with a single disk, the OS will have to serialize the i/o requests to that drive, so there's no opportunity for concurrency. If however you have an index that is too large to be cached in RAM, your query stream is diverse enough so that it cannot be cached, and you have a RAID-based file system which can support multiple concurrent i/o operations, then you may see a speedup. Does that make sense?
Doug
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