Re: CPU bound

Thanks guys - interesting.


On 14/12/2010, at 5:59 AM, Josh Berkus wrote:

> On 12/12/10 6:43 PM, Royce Ausburn wrote:
>> Hi all,
>>
>> I notice that when restoring a DB on a laptop with an SDD, typically postgres is maxing out a CPU - even during a
COPY. I wonder, what is postgres usually doing with the CPU?  I would have thought the disk would usually be the
bottleneckin the DB, but occasionally it's not.  We're embarking on a new DB server project and it'd be helpful to
understandwhere the CPU is likely to be the bottleneck. 
>
> That's pretty normal; as soon as you get decent disk, especially
> something like an SSD with a RAM cache, you become CPU-bound.  COPY does
> a LOT of parsing and data manipulation.  Index building, of course, is
> almost pure CPU if you have a decent amount of RAM available.
>
> If you're restoring from a pg_dump file, and have several cores
> available, I suggest using parallel pg_restore.
>
>
> --
>                                  -- Josh Berkus
>                                     PostgreSQL Experts Inc.
>                                     http://www.pgexperts.com
>
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