Re: [HACKERS] Slow count(*) again...

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От Greg Smith
Тема Re: [HACKERS] Slow count(*) again...
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Msg-id 4D4D0F01.6070407@2ndquadrant.com
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Ответ на Re: [HACKERS] Slow count(*) again...  (Scott Marlowe <scott.marlowe@gmail.com>)
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Scott Marlowe wrote:
> With a 24 drive RAID-10 array that can read at ~1GB/s I am almost
> always CPU bound during copies.  This isn't wholly bad as it leaves
> spare IO for the rest of the machine so regular work carries on just
> fine.
>

And you don't need nearly that much I/O bandwidth to reach that point.
I've hit being CPU bound on COPY...FROM on systems with far less drives
than 24.

--
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books


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