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Date: Mon, 19 Aug 2013 18:07:48 +0300
Subject: Re: postgres crashes on insert in 40 different threads
From: Dzmitry <dzmitry.nikitsin@gmail.com>
To: Frank Lanitz <frank@frank.uvena.de>,
	<pgsql-admin@postgresql.org>
Message-ID: <CE380E09.1199F%dzmitry.nikitsin@gmail.com>
Thread-Topic: [ADMIN] postgres crashes on insert in 40 different threads
In-Reply-To: <521232C2.1060801@frank.uvena.de>
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Yes- I need so many threads, every night I need load jobs from xml to DB.
I need do it as fast as I can, currently it take 4h to load all of
them(around 1000000 jobs).
CPU/IO wait/percent is about 25%. Do you know how can I check other params
related to IO wait ?

Thanks,
  Dzmitry


On 8/19/13 5:59 PM, "Frank Lanitz" <frank@frank.uvena.de> wrote:

>Am 19.08.2013 10:07, schrieb Dzmitry:
>> I am doing a lot of writes to DB in 40 different threads =AD so every
>> thread check if record exists =AD if not =3D> insert record, if exists =
=3D>
>> update record.=20
>> During this update, my disk IO almost always =AD 100% and sometimes it
>> crash my DB with following message:
>
>Is this really needed to have so many threads and chances for race
>conditions?
>
>Beside the mention RAM thing you box might have to low IO capacities for
>this kind of trnasactions. What is the load and in detail the iowait
>saying?
>
>Cheers,
>Frank
>
>
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