| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(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 20:41:44 |
| Message-ID: | CA+TgmoYzUHBnqHNeGO0jRvUY0wtySnbYRMw312kpcXrxMtRAEQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
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?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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