From: Mkrtchyan, Tigran <tigran.mkrtchyan@desy.de>
To: Andrew Dunstan <andrew@dunslane.net>
Cc: pgsql-performance@postgresql.org, Josh Berkus <josh@agliodbs.com>
Subject: Re: postgres 9.3 vs. 9.4
Date: Thu, 18 Sep 2014 21:50:35 +0200 (CEST)
Message-ID: <1364297042.45601.1411069835217.JavaMail.zimbra@z-mbx-2.desy.de> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>
On Sep 18, 2014 9:32 PM, Andrew Dunstan <andrew@dunslane.net> wrote:
>
>
> On 09/18/2014 03:09 PM, Mkrtchyan, Tigran wrote:
> >
> > ----- Original Message -----
> >> From: "Josh Berkus" <josh@agliodbs.com>
> >> To: pgsql-performance@postgresql.org
> >> Sent: Thursday, September 18, 2014 7:54:24 PM
> >> Subject: Re: [PERFORM] postgres 9.3 vs. 9.4
> >>
> >> On 09/18/2014 08:09 AM, Mkrtchyan, Tigran wrote:
> >>>>> 9.4beta2:
> >>>>> ...
> >>>>>
> >>>>>>> 0.957854 END;
> >>>>>>>
> >>>>> Looks like IO.
> >>> Postgres internal IO? May be. We get 600MB/s on this SSDs.
> >> While it's possible that this is a Postgres issue, my first thought is
> >> that the two SSDs are not actually identical. The 9.4 one may either
> >> have a fault, or may be mostly full and heavily fragmented. Or the Dell
> >> PCIe card may have an issue.
> >
> > We have tested both SSDs and they have identical IO characteristics and
> > as I already mentioned, both databases are fresh, including filesystem.
> >
> >> You are using "scale 1" which is a < 1MB database, and one client and 1
> >> thread, which is an interesting test I wouldn't necessarily have done
> >> myself. I'll throw the same test on one of my machines and see how it does.
> > this scenario corresponds to our use case. We need a high transaction rate
> > per for a single client. Currently I can get only ~1500 tps. Unfortunately,
> > posgtress does not tell me where the bottleneck is. Is this is defensively
> > not the disk IO.
> >
> >
> >
>
>
> This is when you dig out tools like perf, maybe.
Do you have a better suggestions ?
>
> cheers
>
> andrew
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: tigran.mkrtchyan@desy.de, andrew@dunslane.net, josh@agliodbs.com
Subject: Re: postgres 9.3 vs. 9.4
In-Reply-To: <1364297042.45601.1411069835217.JavaMail.zimbra@z-mbx-2.desy.de>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox