On Fri, 2003-01-17 at 13:37, Andrew Morton wrote:
> Cliff White <cliffw@osdl.org> wrote:
> >
> > > So it sounds like DBT2 is stabilised now, and producing repeatable results?
> > > That's excellent.
> > Thanks. the kit's available off Sourceforge now, and we'll have STP version
> > up Mondayish.
>
> OK. My utter database ignorance was an
> insurmountable-within-two-hour-attention-span problem when I tried to set up
> dbt1.
That is what we are trying to do with setting it up on STP. So you
don't have to be a database guy. :-) I guess what we need to explore
is how to change the setup of dbt{123} on STP so that it gives you
the information that you need.
Tim
>
> > > So either the I/O scheduler is doing a better job, or the VM page
> > > replacement decisions are agreeable for this load.
> >
> > Okay. Is there something we could do that would point at one or the other?
>
> Different combinations of working set and physical memory will tell us.
>
> Also, when we have a lot of vmstat/etc traces available we can decide how I/O
> bound it is, and whether we need to look at upping the request queue sizes.
> Which is something which we can now do, and which could easily make a
> difference here.
>
> But we'll have to get you onto at least 2.5.58 for that ;)
>
> > would a smaller memory database (say 2GB instead of 4GB ) really show you
> > anything interesting on a 4GB system, since there's so little pressure?
>
> Yes, that would be interesting. We're dealing with single points in
> twenty-seven-dimensional space. Tweaking input parameter individually helps
> one gain an understanding of what is going on.
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