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...)

[Dimitry Andric]

On 24 Jul 2019, at 17:12, mike tancsa <mike at sentex.net> wrote:
> 
> On 7/24/2019 9:45 AM, Dimitry Andric wrote:
>> On 24 Jul 2019, at 14:47, mike tancsa <mike at sentex.net> wrote:
>>> On 7/23/2019 2:40 PM, Dimitry Andric wrote:
>>>> Author: dim
>>>> Date: Tue Jul 23 18:40:32 2019
>>>> New Revision: 350256
>>>> URL: https://svnweb.freebsd.org/changeset/base/350256
>>>> 
>>> Hi,
>>> 
>>>    Not sure if this is just a difference in the versions or more things
>>> are being compiled, but I noticed a buildworld on my Ryzen went from ~
>>> 31min to just over 40min.   Is this expected ?
>> Most likely this is because it will now build a bootstrap compiler,
>> whereas previously your system may have skipped this step.  Can you
>> compare the results when setting MK_SYSTEM_COMPILER=no and
>> MK_SYSTEM_LINKER=no ?
> 
> Adding those two to src.conf and make.conf still shows 40min
> 
>  time make -j14 buildworld > /var/log/build.out ; time make -j14
> buildkernel > /var/log/build.out.
> [Creating objdir /usr/obj/usr/src/amd64.amd64...]
> 25312.621u 1237.984s 40:09.72 1101.8%   45579+3473k 656666+3288880io
> 214633pf+0w
> 1675.467u 173.497s 2:37.90 1170.9%      37728+3167k 207118+3329460io
> 61829pf+0w
> 
> Should I be setting these vars somewhere else ?

Ah, setting them in src.conf, make.conf or the environment will be
overridden from Makefile.inc1, unfortunately.  It will then show
something like:

make[1]: "/home/dim/src/stable-12/Makefile.inc1" line 343: SYSTEM_COMPILER: libclang will be built for bootstrapping a cross-compiler.
make[1]: "/home/dim/src/stable-12/Makefile.inc1" line 348: SYSTEM_LINKER: libclang will be built for bootstrapping a cross-linker.

E.g, it detects that your system compiler is of a lower version than
the compiler in the source tree, and will thus bootstrap the latter.

Can you compare the timings when setting MK_SYSTEM_COMPILER=yes and
MK_SYSTEM_LINKER=yes?  In that case, both before and after r350256, the
results should be fairly similar, I expect.

-Dimitry

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