Date: Thu, 25 Jul 2019 18:09:52 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: mike tancsa <mike@sentex.net> Cc: freebsd-stable@freebsd.org Subject: Re: Buildworld times (was Re: svn commit: r350256 - in stable/12: . contrib/compiler-rt/lib/sanitizer_common contrib/libunwind/src contrib/llvm/lib/DebugInfo/DWARF contrib/llvm/lib/MC contrib/llvm/lib/Object contrib/llvm/lib/Ta...) Message-ID: <2B4E531D-F26E-4615-8F46-0869ED951138@FreeBSD.org> In-Reply-To: <C9E884D6-0FA1-4F3B-A3C5-3ECD2E01FD0F@FreeBSD.org> References: <201907231840.x6NIeWeq024894@repo.freebsd.org> <b085970b-4e20-6802-182a-c6c976b4fc05@sentex.net> <0CB72C19-405C-41F0-8967-96F363228ED6@FreeBSD.org> <f428eb69-ae82-2255-19ce-3b81e8c68f6e@sentex.net> <8373E39A-46E7-41AB-BC1F-8CDF65F47287@FreeBSD.org> <b07742fd-2d3a-3ada-7066-6e5762e64473@sentex.net> <801c0dd8-7a50-d93f-77f6-999aaa91a295@sentex.net> <C9E884D6-0FA1-4F3B-A3C5-3ECD2E01FD0F@FreeBSD.org>
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On 24 Jul 2019, at 23:21, Dimitry Andric <dim@FreeBSD.org> wrote:
>
> On 24 Jul 2019, at 22:56, mike tancsa <mike@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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