On 24 Jul 2019, at 23:21, Dimitry Andric <d...@freebsd.org> wrote: > > On 24 Jul 2019, at 22:56, mike tancsa <m...@sentex.net> wrote: >> >> On 7/24/2019 1:21 PM, mike tancsa wrote: >>> On 7/24/2019 12:02 PM, Dimitry Andric wrote: > ... >>> # cat /etc/src.conf /etc/make.conf >>> MK_SYSTEM_COMPILER=no >>> MK_SYSTEM_LINKER=no >>> KERNCONF=server >>> MK_SYSTEM_COMPILER=no >>> MK_SYSTEM_LINKER=no >> >> Hmmm, is the logic reversed somehow ? The good news is if nothing is >> defined, it does the right thing. > > The idea is that the default is to *not* bootstrap the compiler, if the > system compiler is new enough. E.g. if you build r350256 from a system > built before r350256, it will normally automatically bootstrap > everything. > > E.g., your previous builds did not have to bootstrap, and now they do, > which is why they take longer. > > So the only good way to compare is to force MK_SYSTEM_COMPILER=yes and > MK_SYSTEM_LINKER=yes, so both buildworlds will do the same thing. > > I did a few tests on a relatively fast machine, and buildworld with > those settings on took approximately the same time at r350255 and > r350256. I'm now repeating those experiments to feed the results to > ministat.
Repeating buildworld 3 times for r350255 and r350256 (with both
MK_SYSTEM_COMPILER and MK_SYSTEM_LINKER set to "yes") shows no
difference in measured real time, according to ministat:
$ head real-*.txt
==> real-r350255.txt <==
1562.12
1587.61
1582.78
==> real-r350256.txt <==
1574.50
1559.20
1584.50
$ ministat real-*.txt
x real-r350255.txt
+ real-r350256.txt
+------------------------------------------------------------------------------+
|+ x + x + x |
| |_________|____________________A___M______A____________M______|____________||
+------------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 3 1562.12 1587.61 1582.78 1577.5033 13.539477
+ 3 1559.2 1584.5 1574.5 1572.7333 12.742187
No difference proven at 95.0% confidence
-Dimitry
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