Re: system usage stats (Was: Re: Why Not MySQL? )

On Thu, May 04, 2000 at 11:06:20AM -0400, Tom Lane wrote:
> Don Baccus <dhogaza(at)pacifier(dot)com> writes:
> > So, what's the bottom line? The numbers don't tell us much,
> > though I still think Tom's right that the PG7.0 one is really
> > slower. You just can't say if how MUCH slower.
>
> Actually I was a lot more concerned about disk performance than CPU
> speed. I notice no one's said anything about the relative speed
> of Mitch's two different disk setups ...
>

Mitch wrote:
> Ok, the production server is a Celeron 433, 512 MEgs of PC100 ECC RAM, 2 18
> Gig Ultra 160 SCSI drives (only running at 80 megs since we dono't have a
> 64-bit PCI slot).
>
> There is a big upgrade planned for this box when the motherboard we're
> waiting for comes out..
>
> The development server is a PII450, 128 Megs of RAM and Ultra 2 SCSI
> drives.. However it's running several other things other than the database
> and webserver so it has a small load.
>

So, 6.5.3 is running on Ultra 160 drives, with the controller throttled to
80 MB/s, and 7.0 is running on Ultra 2 drives, which also has a controller
maximum of 80 MB/s. However, the sustained transfer speed of the drives
themselves are what should be limiting: if they're all relatively modern
drives, 20MB/s is typical, so neither config will max out the controller.
(2 drives each, right?)

Ross
--
Ross J. Reedstrom, Ph.D., <reedstrm(at)rice(dot)edu>
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St., Houston, TX 77005