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Date:      Fri, 18 Nov 2016 11:03:47 -0200
From:      Eduardo Lemos de Sa <eduardo.lemosdesa@gmail.com>
To:        Polytropon <freebsd@edvax.de>
Cc:        Matt Smith <matt.xtaz@gmail.com>, "Christoph P.U. Kukulies" <kuku@kukulies.org>,  "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: how long does a make buildworld normally take?
Message-ID:  <CA+njGkuR5G57m8KrShfkf3Noa-njWpV2vFiOHOBKG0z+1YEXEg@mail.gmail.com>
In-Reply-To: <20161118115801.4ef94f0d.freebsd@edvax.de>
References:  <b3bc55ef-5389-0f46-752a-290a45ee97fc@kukulies.org> <20161118101752.GA39102@gmail.com> <20161118115801.4ef94f0d.freebsd@edvax.de>

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Dear


On Fri, Nov 18, 2016 at 8:58 AM, Polytropon <freebsd@edvax.de> wrote:

> On Fri, 18 Nov 2016 10:17:52 +0000, Matt Smith wrote:
> > On Nov 18 10:38, Christoph P.U. Kukulies wrote:
> > >how long does a make buildworld normally take?
> > >Has make buildworld time constant over the years?
> > >
> > >
> > >In 1995 "make world" on a Pentium Pro about 18 hours
> > >On my 4GB, CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> > >(1995.64-MHz 686-class CPU)
> > >make buildworld took about 18 hours. Well that CPU isn't the latest
> > >either (10 Years or so)
> > >
> >
> > 18 hours?! On my current home-server which is an Intel Atom D525 1.8ghz
> > it only takes 5 hours. And these are not known for being fast at all.
>
> Allow me to quote from a message I wrote in 2008, in order to
> illustrate technical progress by collectingg several build times
> for different world and kernel configurations.
>
> FreeBSD 5 on Pentium 4 with 2 GHz and 1 GB RAM:
>
> b.world+b.kern: 17494.415u 2562.134s 5:46:42.25 96.4% (with CFLAGS)
>                 17474.169u 2481.368s 5:46:30.40 95.9% (without CLFAGS)
>                  5608.712u 1595.130s 2:13:18.67 90.0%
>                  6382.185u 1788.433s 2:26:36.06 92.8%
> buildworld:      5086.993u 1431.086s 1:58:16.33 91.8%
>                 11457.047u 2151.158s 3:54:15.31 96.8%
> buildkernel      2326.380u  234.457s   43:42.15 97.6%
>                  1102.491u  278.194s   25:18.58 90.9%
>                  1182.203u  294.622s   26:12.71 93.9%
>                  1518.402u  310.741s   34:16.96 88.9%
>                  3289.368u  529.669s 1:05:25.90 97.2%
> installkernel:      5.718u    6.898s    0:30.97 40.6%
>                     6.655u    7.389s    0:32.08 43.7%
>                     6.994u    7.734s    0:33.19 44.3%
>
> (...software advance happens here...)
>
> FreeBSD 7 on Pentium 4 with 2 GHz and 1 GB RAM:
>
> b.world+b.kern: 16574.070u 2516.128s 6:06:03.90 86.9% (with debug)
>                 18232.967u 2427.404s 7:19:49.24 78.2% (with debug)
>                 18992.839u 2569.146s 9:12:00.28 65.1%
> buildworld:     11457.047u 2151.158s 3:54:15.31 96.8%
> buildkernel:     3289.368u  529.669s 1:05:25.90 97.2%
>                  3503.732u  524.399s 1:11:05.53 94.4%
>                  4032.019u  572.636s 1:58:29.08 64.7% (with debug)
> installkernel:     17.396u   12.587s    0:46.89 63.9%
>                    18.890u   12.131s    1:11.85 43.1%
>
> As you can see, 5 hours was a possible value on a single-core
> single-threat slow-as-ass CPU. But then the system became more
> advanced, and 7 - 9 hours compile time became possible. :-)
>
>
>
> > In
> > 1996 ish I was doing it on something like a pentium 75 and I think it
> > still took about 5 hours. So you're right there! 18 hours seems way too
> > long though.
>
> On my first FreeBSD machine, compiling world and kernel needed
> approx. 24 hours. The kernel itself could be rebuilt in more or
> less 6 hours. Today we have loadable modules. :-)
>
>
>
> > These days it compiles things like clang which take a very long time.
>
> But it also introduces optimization which the "old compilers" did
> not provide, so by investing more build time, you get a better
> runtime experience (programs run faster). Especially on limited
> hardware, this is worth considering (like in ye olde days setting
> several "strange" CFLAGS to make mplayer perform better).
>
>
>
> --
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...
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>


I found strange to spend 18, or even, 5 hours to finish a make buildworld.
My desktop is certainly the faster for standart machines:

hw.machine: amd64
hw.model: AMD FX(tm)-8320 Eight-Core Processor
hw.ncpu: 8
hw.machine_arch: amd64

with 16 GB Ram (1333 MHz)

and spend less than 2 hours:

--------------------------------------------------------------
>>> World build started on Wed Nov 16 17:23:35 BRST 2016
--------------------------------------------------------------

--------------------------------------------------------------
>>> Rebuilding the temporary build tree
--------------------------------------------------------------


--------------------------------------------------------------
>>> World build completed on Wed Nov 16 19:07:33 BRST 2016
--------------------------------------------------------------


It is a FreeBSD-10.3-release, with a single processor (no parallel)

I suggest you to check your procedure or even possible problems with your
hard disk.

My best wishes

Eduardo


--=20
Eduardo Lemos de Sa
Associated Professor Level 4
Dep. Quimica da Universidade Federal do Paran=C3=A1
fone: +55(41)3361-3300
fax:   +55(41)3361-3186



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