Re: installing world from src on a pkgbase system

On 3/26/26 12:05, Pat Maddox wrote:
> On Thu, Mar 26, 2026, at 9:52 AM, Mark Millard wrote:
>> On 3/26/26 04:30, polyduekes@proton.me wrote:
>>> On Thursday, March 26th, 2026 at 3:26 AM, Lexi Winter <ivy@freebsd.org> wrote:
>>>
>>>> polyduekes@proton.me wrote in <m-cS1PTzow3fGVjDOpYyn6W_o4S1wWeW_rAts1LiWRgqkb4CXug6y8weHusL07G9vt2l5WGX76OF2C-JckHufUvwSqJ4511_3wNZ81QeOz4=@proton.me>:
>>>>> is needing to do both buildworld and buildkernel to create a pkg repo
>>>>> the intended behaviour or is that planned to change
>>>>
>>>> right now i don't believe there are any plans to change that.  i suppose
>>>> it might change in the future.  usually people want to build both the
>>>> world and the kernel, so this isn't an oft-requested feature.
>>>>
>>>> could you elaborate on why you want to build world but not kernel?
>>>> this would help inform development efforts in that area.
>>>>
>>> i usually make my own changes to base code to test some things and learn a few others,and most of the time the changes i make touch only world and dont touch kernel at all,so i like to avoid unnecessary compilation of the binaries and things i didn't change and doing only make buildworld and not make buildkernel buildworld is part of that reason
>>
>> Are you aware of META_MODE for buildworld and buildkernel (with its use
>> of filemon.ko)? Its purpose is to keep track of things and so generally
>> rebuild what is necessary but avoid rebuilding what is not. For example,
>> back to back rebuilds have the second one not taking very long based on
>> the lack of changes.
> 
> How long is "not very long" in your experience?

I happen to have been doing builds as part of a long overdue update of
my context. The below builds were executed from an official pkgbase
distribution of main that was booted, using the non-debug kernel that
was distributed. (Only a debug world is distributed for main.) But I was
building non-debug worlds and kernels of nearly the same source code,
with other tailoring involved, such as static linking of the llvm
related toolchain.

I've access to a wide range of system performance, from old armv7 RPi*'s
to a 7950X3D amd64 system with Optane 1.4T media on PCIe.

First picking an aarch64 system likely slow compared to common amd64
hardware, but faster than a RP* aarch64 system, showing both
from-scratch build time and then the rebuild, not having changed
anything, showing both World and Kernel. . .

Microsoft Dev Kit 2023 from-scratch build sequence, USB3 based media, 8
core, 32 GiByTes of RAM: (I have reordered lines to have the world's
together and the kernels together and used extra end-of-lines to group
things and some leading spaces to avoid misformatting)

# grep "built.*ncpu:"
/usr/obj/BUILDs/main-CA76-nodbg-clang/sys-typescripts/typescript-make-main-*.2026-03-2[56]*

/usr/obj/BUILDs/main-CA76-nodbg-clang/sys-typescripts/typescript-make-main-CA76-nodbg-clang.aarch64-host.2026-03-25:23:12:00:
 >>> World built in 10909 seconds, ncpu: 8, make -j12
/usr/obj/BUILDs/main-CA76-nodbg-clang/sys-typescripts/typescript-make-main-CA76-nodbg-clang.aarch64-host.2026-03-26:13:04:35:
 >>> World built in 146 seconds, ncpu: 8, make -j12

/usr/obj/BUILDs/main-CA76-nodbg-clang/sys-typescripts/typescript-make-main-CA76-nodbg-clang.aarch64-host.2026-03-26:02:13:50:
 >>> Kernel(s)  GENERIC-NODBG-CA76 built in 632 seconds, ncpu: 8, make -j12
/usr/obj/BUILDs/main-CA76-nodbg-clang/sys-typescripts/typescript-make-main-CA76-nodbg-clang.aarch64-host.2026-03-26:13:07:02:
 >>> Kernel(s)  GENERIC-NODBG-CA76 built in 11 seconds, ncpu: 8, make -j12


A faster system . . .

amd64 7950X3D with Optane 1.4T media on PCIe, 32 freebsd CPUs (16 SMT
cores);, 192 GiBytes of RAM:

# grep 'built.*ncpu:'
/usr/obj/BUILDs/main-ZNV4-*-clang/sys-typescripts/typescript-make-ZNV4-*-clang-amd64-host-2026-03-2[56]*

/usr/obj/BUILDs/main-ZNV4-nodbg-clang/sys-typescripts/typescript-make-ZNV4-nodbg-clang-amd64-host-2026-03-25:15:50:07:
 >>> World built in 1048 seconds, ncpu: 32, make -j48
/usr/obj/BUILDs/main-ZNV4-nodbg-clang/sys-typescripts/typescript-make-ZNV4-nodbg-clang-amd64-host-2026-03-26:13:10:20:
 >>> World built in 34 seconds, ncpu: 32, make -j48

/usr/obj/BUILDs/main-ZNV4-nodbg-clang/sys-typescripts/typescript-make-ZNV4-nodbg-clang-amd64-host-2026-03-25:15:47:41:
 >>> Kernel(s)  GENERIC-NODBG built in 91 seconds, ncpu: 32, make -j48
/usr/obj/BUILDs/main-ZNV4-nodbg-clang/sys-typescripts/typescript-make-ZNV4-nodbg-clang-amd64-host-2026-03-26:13:10:54:
 >>> Kernel(s)  GENERIC-NODBG built in 2 seconds, ncpu: 32, make -j48


So the example ratios span:
10909/146 approx.= 74.7
 1048/34  approx.= 30.8

I'll not get into the details of my builds. The builds are personal
builds in various ways.

> 
> Pat
> 
> 

Note: I'm not set up to send to freebsd-questions.

-- 
===
Mark Millard
marklmi at yahoo.com