Date: Thu, 26 Feb 2015 20:56:13 -0800 From: Garrett Cooper <yaneurabeya@gmail.com> To: Rui Paulo <rpaulo@me.com> Cc: svn-src-all@freebsd.org, src-committers <src-committers@freebsd.org>, Garrett Cooper <ngie@FreeBSD.org> Subject: Re: svn commit: r279197 - head Message-ID: <C0906576-7CC3-476D-81C7-950E2C75052D@gmail.com> In-Reply-To: <3b7e5239-f803-4270-a0c1-d6b0cbe07d97@me.com> References: <3b7e5239-f803-4270-a0c1-d6b0cbe07d97@me.com>
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On Feb 23, 2015, at 11:42, Rui Paulo <rpaulo@me.com> wrote:
> How much time did this save?
Test profile:
- 4 x CPU VMware Fusion hosted amd64 VM with 4GB allocated to it and =
with open-vm-tools installed
- Kernel with WITNESS watch turned on.
- Multiuser mode (because I=92m lazy)
The worst case scenario was tested:
- All BOOTSTRAPPING checks were removed
- The default SRCCONF values were set
- I built with i386 instead of amd64 (to force elftoolchain and the =
dtrace tools to always be built).
Observations:
-j1: standard deviation was huge (5.75 is not statistically accurate), =
so I threw out a few outliers and redid the numbers.
-j1 vs -j4: ~3 minutes faster -> ~3x speedup
-j4 vs -j8: -> no real noticeable change, but the outliers were =
statistically larger.
Cheers!
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
-j1:
$ grep ' 1:.*real' ts | awk 'NR > 1 { print $3 }' | ministat=20
x <stdin>
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
| x =
=
|
| x x x x x x =
x =
x x|
=
||__________________________________________________M____________________A=
_______________________________________________________________________| =
|
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
N Min Max Median Avg =
Stddev
x 10 259.57 275.06 263.04 264.747 =
5.7545094
-j1 (statistically more accurate sample, but smaller sample size):
$ grep ' 1:.*real' ts | awk 'NR > 1 && NR < 8 { print $3 }' | ministat
x <stdin>
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
| xx x =
x =
x x|
=
||________________________________________________________________________=
____________A____________________________________M________________________=
________________________| |
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
N Min Max Median Avg =
Stddev
x 6 260.45 263.8 262.46 261.83667 =
1.4530336
-j4:
$ grep ' 4:.*real' ts | awk 'NR > 1 { print $3 }' | ministat
x <stdin>
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
|x x x x =
x x =
x x xx|
| =
|_________________________________________________________________________=
_____A_M__________________________________________________________________=
_________| |
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
N Min Max Median Avg =
Stddev
x 10 87.78 90.34 89.04 89.011 =
0.99822565
$ grep =91 8:.*real' ts | awk 'NR > 1 { print $3 }' | ministat =
=
=20
x <stdin>
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
|x x x x =
x x x x x =
x|
| =
|________________________________________________________A_____M__________=
________________________________________| =
|
=
+-------------------------------------------------------------------------=
--------------------------------------------------------------------------=
-------------------------------------------------------+
N Min Max Median Avg =
Stddev
x 10 87.66 93.91 90.77 90.572 =
1.7769249
-j1 (statistically inaccurate) vs -j4:
$ python2.7 -c 'm1 =3D 264.747; m4 =3D 89.011; print (m1/m4), (m1-m4)' =
=
=20
2.97431778095 175.736
-j1 (statistically accurate) vs -j4:
$ python2.7 -c 'm1 =3D 261.83667; m4 =3D 89.011; print (m1/m4), (m1-m4)' =
=
=20
2.94162148499 172.82567
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