Re: Why we are going to have to go DirectIO

On 12/05/2013 12:41 PM, Robert Haas wrote:
> On Thu, Dec 5, 2013 at 12:54 PM, Josh Berkus <josh@agliodbs.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