Apparent performance regression 8.3@ -> 8.4 at r255966?

[David Wolfskill]

On Mon, Oct 07, 2013 at 10:32:57AM -0700, Adrian Chadd wrote:
> On Oct 7, 2013 1:28 PM, "David Wolfskill" <david at 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.
> 
> 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.
> 
> 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 = 0.194874)



Peace,
david
-- 
David H. Wolfskill				david at 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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