| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | "Aaron Werman" <awerman2(at)hotmail(dot)com>, "Qing Zhao" <qzhao(at)quotefx(dot)net>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: possible improvement between G4 and G5 |
| Date: | 2004-04-06 18:52:17 |
| Message-ID: | 200404061152.17997.josh@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-performance |
Aaron,
> I'm surprised by this thought. I tend to hit CPU bottlenecks more often than
> I/O ones. In most applications, db I/O is a combination of buffer misses and
> logging, which are both reasonably constrained.
Not my experience at all. In fact, the only times I've seen modern platforms
max out the CPU was when:
a) I had bad queries with bad plans, or
b) I had reporting queires that did a lot of calculation for display (think
OLAP).
Otherwise, on the numerous servers I administrate, RAM spikes, and I/O
bottlenecks, but the CPU stays almost flat.
Of course, most of my apps are large databases (i.e. too big for RAM) with a
heavy transaction-processing component.
What kind of applications are you running?
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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