From: | Jérôme BENOIS <benois(at)argia-engineering(dot)fr> |
---|---|
To: | Guillaume Smet <guillaume(dot)smet(at)gmail(dot)com> |
Cc: | Scott Marlowe <smarlowe(at)g2switchworks(dot)com>, Dave Dutcher <dave(at)tridecap(dot)com>, pgsql-performance(at)postgresql(dot)org, Xavier Milliard <milliard(at)argia(dot)fr> |
Subject: | Re: High CPU Load |
Date: | 2006-09-14 21:48:42 |
Message-ID: | 1158270523.5167.18.camel@localhost.localdomain |
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Lists: | pgsql-performance |
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(at)gnireenigne-aigra(dot)rf'.split('@')])"
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