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Re: CPU bound

From: Royce Ausburn <royce(at)inomial(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>, Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: CPU bound
Date: 2010-12-13 21:03:54
Message-ID: 7F2CF023-C154-4F7F-9373-2470D4553096@inomial.com (view raw or flat)
Thread:
Lists: pgsql-performance
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.
> 
> 
> -- 
>                                  -- Josh Berkus
>                                     PostgreSQL Experts Inc.
>                                     http://www.pgexperts.com
> 
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