| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Christopher Petrilli <petrilli(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Sustained inserts per sec ... ? |
| Date: | 2005-04-01 20:53:38 |
| Message-ID: | 1112388818.3487.34.camel@jd2.commandprompt.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
> What seems to happen is it slams into a "wall" of some sort, the
> system goes into disk write frenzy (wait=90% CPU), and eventually
> recovers and starts running for a while at a more normal speed. What
> I need though, is to not have that wall happen. It is easier for me
> to accept a constant degredation of 5%, rather than a 99% degredation
> for short periods, as it can cause cascade problems in the system.
Could this possibly be a checkpoint happening?
Also how many checkpoint segments do you have?
>
> My goal is to gather some numbers, and post code + schema + analysis.
>
> Chris
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