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From Michael McCandless <>
Subject Re: RangeFilter performance problem using MultiReader
Date Fri, 10 Apr 2009 19:30:06 GMT
On Fri, Apr 10, 2009 at 3:06 PM, Mark Miller <> wrote:

> 24 segments is bound to be quite a bit slower than an optimized index for
> most things

I'd be curious just how true this really is (in general)... my guess
is the "long tail of tiny segments" gets into the OS's IO cache (as
long as the system stays hot) and doesn't actually hurt things much.

Has anyone tested this (performance of unoptimized vs optimized
indexes, in general) recently?  To be a fair comparison, there should
be no deletions in the index.


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