10.0
10.0-rc1
10.1
10.1-rc1
11.0
11.0-rc1
11.0-rc2
11.0-rc3
11.1
11.1-rc1
11.2
11.2-rc1
11.3
11.3-rc1
12.0
12.0-rc1
12.1
12.1-rc1
12.2
12.2-rc1
6.0
6.1
6.1.1
6.3
6.4
6.5
6.6
6.7
6.8
7.0
7.1
7.2
7.3
7.4
7.5
7.5-systemd
7.6
7.6-systemd
7.7
7.7-systemd
7.8
7.8-systemd
7.9
7.9-systemd
8.0
8.1
8.2
8.3
8.4
9.0
9.1
arm
bdubbs/gcc13
ml-11.0
multilib
renodr/libudev-from-systemd
s6-init
trunk
v5_0
v5_1
v5_1_1
xry111/arm64
xry111/arm64-12.0
xry111/clfs-ng
xry111/lfs-next
xry111/loongarch
xry111/loongarch-12.0
xry111/loongarch-12.1
xry111/loongarch-12.2
xry111/mips64el
xry111/multilib
xry111/pip3
xry111/rust-wip-20221008
xry111/update-glibc
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1 | <sect1 id="ch02-aboutsbus">
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2 | <title>About SBUs</title>
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3 | <?dbhtml filename="aboutsbus.html" dir="chapter02"?>
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4 |
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5 | <para>Most people would like to know beforehand how long it approximately
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6 | takes to compile and install each package. But "Linux from Scratch" is built
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7 | on so many different systems, it is not possible to give actual times that are
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8 | anywhere near accurate: the biggest package (Glibc) won't take more than
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9 | twenty minutes on the fastest systems, but will take something like three days
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10 | on the slowest -- no kidding. So instead of giving actual times, we've come up
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11 | with the idea of using the <emphasis>Static Binutils Unit</emphasis>
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12 | (abbreviated to <emphasis>SBU</emphasis>).</para>
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13 |
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14 | <para>It works like this: the first package you compile in this book is the
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15 | statically linked Binutils in Chapter 5, and the time it takes to compile this
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16 | package is what we call the "Static Binutils Unit" or "SBU". All other compile
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17 | times will be expressed relative to this time.</para>
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18 |
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19 | <para>For example, the time it takes to build the static version of GCC is 3.9
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20 | SBU. This means that if on your system it took 10 minutes to compile and
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21 | install the static Binutils, then you know it will take nearly 40 minutes to
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22 | build the static GCC. Fortunately, most build times are much shorter than the
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23 | one of Binutils.</para>
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24 |
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25 | <para>Note that SBUs don't work well for SMP-based machines. But if you're so
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26 | lucky as to have multiple processors, chances are that your system is so fast
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27 | that you don't mind.</para>
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28 |
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29 | </sect1>
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30 |
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