From: Thomas SIMON <tsimon@neteven.com>
To: pgsql-admin@postgresql.org
Subject: Re: Performances issues with SSD volume ?
Date: Mon, 18 May 2015 15:35:55 +0200
Message-ID: <5559EABB.1060405@neteven.com> (raw)
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Hi matheus,
thanks for reply.
Kernel is slightly different ; with a 3.10.23-xxxx-std-ipv6-64 kernel
(OVH kernel) on HDD server, and 3.2.65-1+deb7u1 kernel on SSD server.
I'm using debian wheezy on both servers.
I didn't changed the 2 parameters you talk about.
Thanks,
Thomas
Le 18/05/2015 15:13, Matheus de Oliveira a écrit :
>
> On Mon, May 18, 2015 at 10:05 AM, Thomas SIMON <tsimon@neteven.com
> <mailto:tsimon@neteven.com>> wrote:
>
> After the change, I had the following behavior, and I don't
> understand why : everything seems to work fine (load is ~6/7, when
> it was previously ~25/30 on the HDD server), so the SSD server is
> faster than the HDD one, and my apps run faster too, but after
> some time (can be 5 minutes or 2 hours), the load average
> increases suddently (can reach 150 !) and does not decrease, so
> postgres and my application are almost unusable. (even small
> requests are in statement timeout)
>
>
> Before we go mad, what is the OS/kernel/distro that you are using? Did
> it change from the previous one?
>
> If Linux, have you disabled transparent_huge_pages and
> zone_reclaim_mode (two known problematic Linux features)?
>
> Best regards,
> --
> Matheus de Oliveira
> Analista de Banco de Dados
> Dextra Sistemas - MPS.Br nível F!
> www.dextra.com.br/postgres <http://www.dextra.com.br/postgres/;
>
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To: pgsql-admin@postgresql.org
Cc: tsimon@neteven.com
Subject: Re: Performances issues with SSD volume ?
In-Reply-To: <5559EABB.1060405@neteven.com>
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