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 bottleneck in the DB, but occasionally it's not. We're embarking on a new DB server project and it'd be helpful to understand where 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.
>
>
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> -- Josh Berkus
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> http://www.pgexperts.com
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