freebsd stable - Jun 2020 - Buildworld and buildkernel with very slow compilation, recently

Hi,

I am following FreeBSD 12.1-STABLE. 

Clang has been upgraded to version 10.0.0 on May, 1st, and ever since that time,
I do observe a dramatic increase in compilation times of building world, kernel
and ports. I didn't benchmark the exact times, but compilation times are at
least increased by a factor of 1.5. Nothing has changed of the last month
besides upgrading 12.1-Stable every other week.

Has anyone else been bitten by this?

Regards,
Michael

Michael Grimm wrote:
> Hi,
> 
> I am following FreeBSD 12.1-STABLE.
> 
> Clang has been upgraded to version 10.0.0 on May, 1st, and ever since that
time, I do observe a dramatic increase in compilation times of building world,
kernel and ports. I didn't benchmark the exact times, but compilation times
are at least increased by a factor of 1.5. Nothing has changed of the last month
besides upgrading 12.1-Stable every other week.
Not seeing this after clang update to 10 on both stable/12 and head. 
I'd check if you are excessively swapping now as (not sure about that, 
just guessing) newer clang/llvm could consume more memory during 
compilation, and possibly reducing the make jobs number.

On Sunday, June 21, 2020 8:11:15 AM EDT Michael Grimm
wrote:
> Hi,
> 
> I am following FreeBSD 12.1-STABLE.
> 
> Clang has been upgraded to version 10.0.0 on May, 1st, and ever since that
> time, I do observe a dramatic increase in compilation times of building
> world, kernel and ports. I didn't benchmark the exact times, but
> compilation times are at least increased by a factor of 1.5. Nothing has
> changed of the last month besides upgrading 12.1-Stable every other week.
> 
> Has anyone else been bitten by this?
I don't have measurements to corroborate this, but here's a mailing list
thread where folks are talking about it (split across two URLs, the OP posted 
in April and then there was a followup in May):

http://lists.llvm.org/pipermail/llvm-dev/2020-April/140938.html 
https://lists.llvm.org/pipermail/llvm-dev/2020-May/141482.html 

So there definitely seems to be *something* going on, and you are indeed not 
crazy. :)

Building ports/pkgs is also significantly slower on 13 (new clang) than on 12.1.
http://thunderx1.nyi.freebsd.org/
13 = 140 hours12.1 = 103 hoursFor roughly the same amount of ports.

Regards, Ronald

Van: Michael Grimm <trashcan at ellael.org>
Datum: 21 juni 2020 14:12
Aan: FreeBSD-STABLE Mailing List <freebsd-stable at freebsd.org>
Onderwerp: Buildworld and buildkernel with very slow compilation, recently
> 
> 
> Hi,
> 
> I am following FreeBSD 12.1-STABLE. 
> 
> Clang has been upgraded to version 10.0.0 on May, 1st, and ever since that
time, I do observe a dramatic increase in compilation times of building world,
kernel and ports. I didn't benchmark the exact times, but compilation times
are at least increased by a factor of 1.5. Nothing has changed of the last month
besides upgrading 12.1-Stable every other week.
> 
> Has anyone else been bitten by this?
> 
> Regards,
> Michael
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> 
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