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From Mark Miller <>
Subject Re: indexing cpu utilization
Date Thu, 03 Jan 2013 14:07:36 GMT

On Jan 3, 2013, at 5:40 AM, Uwe Reh <> wrote:

> "use more threads" vs. "use less threads"
> It is a bit confusing. 

My point was to make sure you are using more than one thread. With 32 cores, probably a lot
more than one thread.

Otis' point was that you can also use too many threads.

Both are correct. Make sure you are using enough threads to satisfy the indexing power you
have, but don't use too many - there are diminishing returns and then negative returns over
a given threshold that will depend on your hardware and data.

Sorry about the wrong issue number.

As far as 32 cores being common, it's not common yet based on what I see. On average, I'm
still seeing a lot of 4-8 core hardware. 32 or more has so far proven to be the exception
when supporting Solr users. I'm sure that will continue to shift.

- Mark
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