On Fri, 4 May 2007, Michael Stone wrote:

P4 2.4GHz       107ms
Xeon 3GHz       100ms
Opteron 275     65ms
Athlon X2 4600  61ms
PIII 1GHz       265ms
Opteron 250     39ms
something seems inconsistent here.

I don't see what you mean. The PIII results are exactly what I'd expect, and I wouldn't be surprised that your Opteron 250 has significantly faster memory than my two AMD samples (which are slower than average in this regard) such that it runs this particular task better.

Regardless, the requirement here, as Josh put it, was to get a way to grade the CPUs on approximately a 1-5 scale. In that context, there isn't a need for an exact value. The above has 3 major generations of processors involved, and they sort out appropriately into groups; that's all that needs to happen here.

You misunderstand the purpose of bogomips; they have no absolute meaning, and a comparison between different type of cpus is not possible.

As if I don't know what the bogo stands for, ha! I brought that up because someone suggested testing CPU speed using some sort of idle loop. That's exactly what bogomips does. My point was that something that simple can give dramatically less useful results for predicting PostgreSQL performance than what you can find out running a real query.

--
* Greg Smith [EMAIL PROTECTED] http://www.gregsmith.com Baltimore, MD

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