svn commit: r353937 - in head/share: man/man5 mk

[Dimitry Andric]

On 27 Oct 2019, at 17:59, Alexey Dokuchaev <danfe at 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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