Yes that would work fine.... but you should see a net perf loss by doing so (once you include time to flush/sync the RAMDir to an FSDir).
If you see a perf gain then please report back! Mike McCandless http://blog.mikemccandless.com On Wed, Jan 11, 2012 at 3:09 PM, Cheng <zhoucheng2...@gmail.com> wrote: > Can I create a RAMDirectory based writer and have it work cross all > threads? In the sense, I would like to use RAMDirectory every where and > have the RAMDirectory written to FSDirectory in the end. > > I suppose that should work, right? > > > On Wed, Jan 11, 2012 at 2:31 PM, Michael McCandless < > luc...@mikemccandless.com> wrote: > >> On Wed, Jan 11, 2012 at 1:32 PM, dyzc2010 <zhoucheng2...@gmail.com> wrote: >> >> > Mike, do you mean if I create a FSDirectory based writer in first place, >> then the writer should be used in every thread rather than create a new >> RAMDirectory based writer in that thread? >> >> Right. >> >> > What about I do want to use RAMDirectory to speed up the index and >> search processes? >> >> IndexWriter is very efficient in using RAM across multiple threads >> now... so this isn't worth it at indexing time. >> >> At search time... MMapDirectory is a good way to let the OS use >> currently free RAM for caching. >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
