Re: [ 11/37] sched/nohz: Rewrite and fix load-avg computation --again

From: Peter Zijlstra
Date: Fri Jul 20 2012 - 14:34:43 EST

On Fri, 2012-07-20 at 12:13 -0500, Jonathan Nieder wrote:
> Peter Zijlstra wrote:
> > On Tue, 2012-07-17 at 19:16 -0500, Jonathan Nieder wrote:
> >> I'm thrilled to see this regression fix for stable@, but are we really
> >> really sure that it won't cause new regressions?
> >
> > Doug Smythies ran a ~68 hour test on it, running various synthetic loads
> > of various frequencies against it and comparing the reported load
> > averages against the expected values and found it to be 'good'.
> >
> > This doesn't guarantee we won't find more 'interesting' problems in
> > there, but it does give me fair confidence in it.
> Yeah, that sounds good. Very nice to hear.
> Is the code to generate the synthetic loads and expected results
> somewhere easy to find (like LTP or tools/testing) to make it easier
> to keep this code working well in the future?

/me finds Doug isn't actually on the CC, /me fixes.

Doug had this web-page with all his testing activities, graphs and code

Seems to still work.

Last time I tried his scripts they weren't very user friendly, and afaik
he's making the pretty graphs 'manually'. But whatever he's got is there
I think.

If someone wants to take it and make it pretty and 'usable' for people
in a hurry I'm sure Doug wouldn't mind.
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