10.0
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11.3
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12.0
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12.2
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6.0
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6.3
6.4
6.5
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6.7
6.8
7.0
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7.3
7.4
7.5
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7.6
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7.7
7.7-systemd
7.8
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7.9
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8.0
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xry111/clfs-ng
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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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[0b74af3] | 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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[dc37bc5] | 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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[0b74af3] | 13 |
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[dc37bc5] | 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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[0b74af3] | 18 |
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[dc37bc5] | 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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[0b74af3] | 24 |
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[dc37bc5] | 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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[0b74af3] | 28 |
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| 29 | </sect1>
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| 30 |
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