how long does a make buildworld normally take?
Polytropon
freebsd at edvax.de
Fri Nov 18 10:58:05 UTC 2016
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, ...
More information about the freebsd-questions
mailing list