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| author | Gerard Beekmans <gerard@linuxfromscratch.org> | 2002-09-13 19:31:55 +0000 |
|---|---|---|
| committer | Gerard Beekmans <gerard@linuxfromscratch.org> | 2002-09-13 19:31:55 +0000 |
| commit | 0b74af37ec6c08b3def2538e7deb0c55d35d3793 (patch) | |
| tree | ae82a45831a659997cea852416b191da9e157d19 /chapter02 | |
| parent | d5b037fcac63292b578c183e3d815120067b2d12 (diff) | |
added sbus
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2108 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter02')
| -rw-r--r-- | chapter02/aboutsbus.xml | 30 | ||||
| -rw-r--r-- | chapter02/chapter02.xml | 1 |
2 files changed, 31 insertions, 0 deletions
diff --git a/chapter02/aboutsbus.xml b/chapter02/aboutsbus.xml new file mode 100644 index 000000000..d78e6b719 --- /dev/null +++ b/chapter02/aboutsbus.xml @@ -0,0 +1,30 @@ +<sect1 id="ch02-aboutsbus"> +<title>About SBUs</title> +<?dbhtml filename="aboutsbus.html" dir="chapter02"?> + +<para>SBUs are <emphasis>Static Bash Units</emphasis> and they are our way +of identifying how long a package takes to compile. Why don't we use normal +times like anybody else?</para> + +<para>The biggest problem is that times cannot be acurate, not even a +little bit. So many people install LFS on so many different systems, the +times it takes to compile something varies too much. One package may take +20 minutes on one system, but that same packages may take 3 days on another +(this is not an exaggeration). So instead we've come up with a +<emphasis>Static Bash Unit</emphasis> or <emphasis>SBU</emphasis>.</para> + +<para>It works like this: the very first package you compile in this book +is Bash in chapter 5 and it'll be statically linked. The time it takes to +compile this package will be the basis and called the SBU. All other +compile times are relative to the time it takes to install Bash. For +example, GCC-3.2 takes about 9.5 SBUs and it's proven that this number if +fairly consistent among a lot of different systems. So multiply 9.5 by the +number of seconds it takes for Bash to install (the SBU value) and you get +a close approximation of how long GCC will take on your system.</para> + +<para>Note: SBUs don't work on SMP machines. We've seen that SBUs don't +work well on SMP based machines. So all bets are off if you're lucky enough +to have an SMP setup.</para> + +</sect1> + diff --git a/chapter02/chapter02.xml b/chapter02/chapter02.xml index 56d23ef78..f47d287c2 100644 --- a/chapter02/chapter02.xml +++ b/chapter02/chapter02.xml @@ -3,6 +3,7 @@ <?dbhtml filename="chapter02.html" dir="chapter02"?> &c2-aboutlfs; +&c2-aboutsbus; &c2-download; &c2-install; &c2-platform; |