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Re: Capping CPU usage?

From: Rod Taylor <rbt(at)rbt(dot)ca>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: Pgsql Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Capping CPU usage?
Date: 2002-12-11 18:24:47
Message-ID: 1039631086.17316.194.camel@jester (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, 2002-12-11 at 13:12, Josh Berkus wrote:
> Folks:
>  
> I had a new question from a client: is it possible to "cap" CPU usage
>  for PostgreSQL running on Linux? They don't care if the procedure
>  degrades Postgres performance, but they can't afford to have Postgres
>  take up more than 30% of processor for more than 400 milliseconds
> (they
>  are running some real-time operations).
>  
> I can't imagine that postmaster could do this, but I thought it there
>  might be some kind of Linux Kernel CPU quota option I haven't heard
> of.
>   Can anybody point me in the right direction?

Don't know about Linux, but BSD cannot do that.  CPU limits are hard --
once you hit it it'll dump the process.

Anyway, would it be sufficient to simply reduce the priority of the
process?

-- 
Rod Taylor <rbt(at)rbt(dot)ca>

PGP Key: http://www.rbt.ca/rbtpub.asc

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