Re: HyperThreading and Arriba?

Hi Clint,

I was scouring my email box and found this message.  Did you ever get a
satisfactory resolution to this problem?

On Thu, 2004-01-08 at 17:07, Clint Byrum wrote:
> On Thu, 2004-01-08 at 12:02, Theo Schlossnagle wrote:
> > The Arriba is calculated only once.  If you enable hyperthreading, you 
> > should delete the "arriba" file that holds that number for it to be 
> > recalculated ont hat box.
> > 
> 
> Actually on these boxes, HT was never turned off. But then I realized
> that I had copied the Arriba from an identical machine that did have HT
> turned off. So I rm'd the Arriba, stopped apache, counted to 10, started
> apache.. and it came out significantly lower all three times I tried it.
> The identical non-HT box got 2587086, while the HT box scored 2345555,
> then 2329478, then 2416500. AFAIK the box was completely idle for all of
> these calculations. Maybe the Arriba calc does something that isn't HT
> friendly?
> 
> > > 3) Should we experiment with byCPU or byBusyChildren? I tend to think
> > > byLoad makes the most sense, since these boxes run some database things
> > > that might not register as well with BusyChildren.
> > 
> > use byBusyChildren
> > 
> 
> Any reason you suggest this one over byLoad? Or did you mean, just
> experiment with it? One thing I don't like about this is that I have to
> remember to always 'apachectl graceful' after a stop/start of apache, or
> the stats won't show properly.
> 
> 
> 
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// Theo Schlossnagle
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