Date: Mon, 7 Oct 2013 10:49:29 -0700 From: David Wolfskill <david@catwhisker.org> To: Adrian Chadd <adrian@freebsd.org> Cc: performance@freebsd.org Subject: Re: Apparent performance regression 8.3@ -> 8.4@r255966? Message-ID: <20131007174929.GO1611@albert.catwhisker.org> In-Reply-To: <CAJ-Vmom2vPcRPpSwYkAzsvztRxx7WEgpYjXPdp%2Bfgn43iexkmA@mail.gmail.com> References: <20131007172804.GA7641@albert.catwhisker.org> <CAJ-Vmom2vPcRPpSwYkAzsvztRxx7WEgpYjXPdp%2Bfgn43iexkmA@mail.gmail.com>
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On Mon, Oct 07, 2013 at 10:32:57AM -0700, Adrian Chadd wrote:
> On Oct 7, 2013 1:28 PM, "David Wolfskill" <david@catwhisker.org> wrote:
> >
> > At work, we have a bunch of machines that developers use to build some
> > software. The machines presently run FreeBSD/amd64 8.3-STABLE @rxxxxxx
> > (with a few local patches, which have since been committed to stable/8),
> > and the software is built within a 32-bit jail.
>=20
> Well, whats the start commit? Xxxxxx isnt all that helpful. :-)
r238914M -- sorry; I got impatient & sent th emessage off before I went
through & plugged in the stuff I meant to plug in later.... :-(
> Once you can establish that, we xan go over the commit logs to see what
> changed.
>=20
> Youre building exactly the same software on both, right?
Yes: I have a script that checks out a "sandbox" from the repo, then
tars it up. Each test iteration then:
* Ensures there is nothing of an old sandbox (directory) around.
* Unpacks the pristine copy of the sandbox.
* Dives into the sandbox & performs a measured build.
* Exits the sandbox (and removes it).
> ....
Here's the other bit I neglected to include:
dwolf-fbsd(9.2-S)[30] /usr/bin/ministat -s baseline test_env
x baseline
+ test_env
+--------------------------------------------------------------------------=
----+
| xxxxx xx xxxxxxxx x xx x + =
|
|xxxxxxxx xx xxxxxxxx x xx xxxx x x +x *+ + ++ =
x|
| |___________A____________| =
|
| |____A____| =
|
+--------------------------------------------------------------------------=
----+
N Min Max Median Avg Stddev
x 75 4.91961 6.16419 5.22432 5.2311616 0.20113192
+ 7 5.68327 5.94078 5.86111 5.8563686 0.086090721
Difference at 95.0% confidence
0.625207 +/- 0.153262
11.9516% +/- 2.92979%
(Student's t, pooled s =3D 0.194874)
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Taliban: Evil cowards with guns afraid of truth from a 14-year old girl.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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