Date: Tue, 29 Oct 2019 08:04:07 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Alexey Dokuchaev <danfe@FreeBSD.org> Cc: svn-src-head <svn-src-head@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, src-committers <src-committers@freebsd.org>, Enji Cooper <yaneurabeya@gmail.com> Subject: Re: svn commit: r353937 - in head/share: man/man5 mk Message-ID: <0938D185-8BF4-45CD-925E-328F03695518@FreeBSD.org> In-Reply-To: <20191027165934.GA54960@FreeBSD.org> References: <201910231702.x9NH2jQv045130@repo.freebsd.org> <2B855247-5097-442D-8D4A-77D68D2F6186@gmail.com> <20191024124910.GA93913@FreeBSD.org> <67F6BDD3-B633-4C85-AE85-9B075FF0E49E@FreeBSD.org> <20191027165934.GA54960@FreeBSD.org>
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On 27 Oct 2019, at 17:59, Alexey Dokuchaev <danfe@FreeBSD.org> wrote:
>
> On Sat, Oct 26, 2019 at 04:34:14PM +0200, Dimitry Andric wrote:
...
>> I only tested -j24 on a 32-core system, but I could probably repeat the
>> experiment with lower and higher -j values: [...]
>>
>> So ~2.3% difference in real time, which is not too bad I think.
>
> Well, I'd say it's acceptable. :-/
I also tested at low (-j4) and high (-j32) levels. It turns out that at
low -j levels, the difference is less pronounced, just ~1.1% in real
time. And at high -j levels, it is more pronounced, ~4.3% in real time.
Note also that at high -j levels, the difference in system time seems
to get more influence, e.g. at low -j the difference is ~4.5%, while at
high -j the difference is ~7.2%. I guess it is because dynamic linking
uses more syscalls.
At -j4:
Results for real time:
---------------------------------------------------------------------------
x j4-static-real.txt
+ j4-dynamic-real.txt
N Min Max Median Avg Stddev
x 7 5508.58 5548.05 5533.25 5530.2829 12.323855
+ 7 5514.68 5660.1 5591.25 5593.5143 59.98042
Difference at 95.0% confidence
63.2314 +/- 50.4309
1.14337% +/- 0.912329%
(Student's t, pooled s = 43.2985)
Results for user time:
---------------------------------------------------------------------------
x j4-static-user.txt
+ j4-dynamic-user.txt
N Min Max Median Avg Stddev
x 7 19525.34 19607.74 19593.1 19582.78 29.037717
+ 7 20178.84 20348.11 20214.28 20235.057 57.31409
Difference at 95.0% confidence
652.277 +/- 52.9155
3.33087% +/- 0.272077%
(Student's t, pooled s = 45.4318)
Results for system time:
---------------------------------------------------------------------------
x j4-static-sys.txt
+ j4-dynamic-sys.txt
N Min Max Median Avg Stddev
x 7 1622.63 1634.98 1629.87 1629.1229 4.7234017
+ 7 1672.25 1722.23 1704.49 1703.1729 15.724862
Difference at 95.0% confidence
74.05 +/- 13.5224
4.54539% +/- 0.833228%
(Student's t, pooled s = 11.6099)
At -j32:
Results for real time:
---------------------------------------------------------------------------
x j32-static-real.txt
+ j32-dynamic-real.txt
N Min Max Median Avg Stddev
x 7 1689.19 1735.36 1707.32 1707.8471 16.500078
+ 7 1754.98 1812.57 1777.96 1781.6329 19.554159
Difference at 95.0% confidence
73.7857 +/- 21.0718
4.32039% +/- 1.25627%
(Student's t, pooled s = 18.0917)
Results for user time:
---------------------------------------------------------------------------
x j32-static-user.txt
+ j32-dynamic-user.txt
N Min Max Median Avg Stddev
x 7 38545.36 38802.6 38609.87 38641.009 105.11904
+ 7 39430.93 39924.98 39856.91 39769.979 185.3612
Difference at 95.0% confidence
1128.97 +/- 175.5
2.92169% +/- 0.457446%
(Student's t, pooled s = 150.68)
Results for system time:
---------------------------------------------------------------------------
x j32-static-sys.txt
+ j32-dynamic-sys.txt
N Min Max Median Avg Stddev
x 7 2752.81 2809.97 2781.46 2781.4986 21.86523
+ 7 2906.22 3151.93 2932.59 2981.5757 103.79842
Difference at 95.0% confidence
200.077 +/- 87.3629
7.19314% +/- 3.15079%
(Student's t, pooled s = 75.0073)
-Dimitry
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