From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Peter Geoghegan <pg(at)heroku(dot)com>, Jonathan Corbet <corbet(at)lwn(dot)net>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Why we are going to have to go DirectIO |
Date: | 2013-12-05 20:43:47 |
Message-ID: | 52A0E583.9020009@agliodbs.com |
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Lists: | pgsql-hackers |
On 12/05/2013 12:41 PM, Robert Haas wrote:
> On Thu, Dec 5, 2013 at 12:54 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
>> Actually, I've been able to do 35K TPS on commodity hardware on Ubuntu
>> 10.04. I have yet to go about 15K on any Ubuntu running a 3.X Kernel.
>> The CPU scheduling on 2.6 just seems to be far better tuned, aside from
>> the IO issues; at 35K TPS, the CPU workload is evenly distributed across
>> cores, whereas on 3.X it lurches from core to core like a drunk in a
>> cathedral.
>
> Do drunks lurch differently in cathedrals than they do elsewhere?
Yeah, beacause they lurch from one column to another. It's a visual
metaphor. ;-)
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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