From: Jérôme BENOIS <benois@argia-engineering.fr>
To: Guillaume Smet <guillaume.smet@gmail.com>
Cc: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: Dave Dutcher <dave@tridecap.com>
Cc: pgsql-performance@postgresql.org, Xavier Milliard <milliard@argia.fr>
Subject: Re: High CPU Load
Date: Thu, 14 Sep 2006 23:48:42 +0200
Message-ID: <1158270523.5167.18.camel@localhost.localdomain> (raw)
In-Reply-To: <1d4e0c10609141422o57ecf28eobf3d0b7594bb242f@mail.gmail.com>
References: <004001c6d80e$bdef5bc0$8300a8c0@tridecap.com>
<1158249411.24726.17.camel@state.g2switchworks.com>
<1158268058.5167.2.camel@localhost.localdomain>
<1d4e0c10609141422o57ecf28eobf3d0b7594bb242f@mail.gmail.com>
Hi Guillaume,
Le jeudi 14 septembre 2006 à 23:22 +0200, Guillaume Smet a écrit :
> Jérôme,
>
> Perhaps it's a stupid question but are your queries slower than
> before? You didn't tell it.
No, it's not stupid question !
Yes queries speed but when the load average exceeds 40 all queries are slower than before.
> IMHO, it's not a problem to have a high load if you have a lot of
> users and your queries are fast (and with 8.1, they should be far
> faster than before).
Yes i have a lot of users ;-)
>
> To take a real example, we had a problem with a quad xeon running
> postgres 7.4 and even when there were a lot of queries, the load was
> always lower than 4 and suddenly the queries were really slow and the
> database was completely unusable.
> When we upgraded to 8.1, on very high load, we had a far higher cpu
> load but queries were far faster even with a high cpu load.
I agree but by moment DB Server is so slow.
> Considering your top output, I suspect you use HT and you should
> really remove it if it's the case.
what's means "HT" please ?
> --
> Guillaume
If you want, my JabberId : jerome.benois AT gmail.com
--
Jérôme,
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'sioneb@gnireenigne-aigra.rf'.split('@')])"
Attachments:
signature.asc (application/pgp-signature, 190B) download
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: benois@argia-engineering.fr, guillaume.smet@gmail.com, smarlowe@g2switchworks.com, dave@tridecap.com, milliard@argia.fr
Subject: Re: High CPU Load
In-Reply-To: <1158270523.5167.18.camel@localhost.localdomain>
* 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