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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: Seem contradictive -- indexwriter in handling multiple threads
Date Wed, 11 Jan 2012 20:21:38 GMT
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 <zhoucheng2008@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 <
> lucene@mikemccandless.com> wrote:
>
>> On Wed, Jan 11, 2012 at 1:32 PM, dyzc2010 <zhoucheng2008@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
>>
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