Re: New to PostgreSQL, performance considerations

On Mon, 11 Dec 2006, Michael Stone wrote:

> Can anyone else reproduce these results? I'm on similar hardware (2.5GHz P4,
> 1.5G RAM)...

There are two likely candidates for why Daniel's P4 3.0GHz significantly
outperforms your 2.5GHz system.

1) Most 2.5GHZ P4 processors use a 533MHz front-side bus (FSB); most
3.0GHZ ones use an 800MHz bus.

2) A typical motherboard paired with a 2.5GHz era processor will have a
single-channel memory interface; a typical 3.0GHZ era board supports
dual-channel DDR.

These changes could easily explain the magnitude of difference in results
you're seeing, expecially when combined with a 20% greater raw CPU clock.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD