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Add clarifying paragraph about SBUs.

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3016 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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Greg Schafer 2003-10-21 00:38:06 +00:00
parent 1a38cda977
commit 0dc87e046c
1 changed files with 14 additions and 8 deletions
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chapter02/aboutsbus.xml
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@ -16,15 +16,21 @@ statically linked Binutils in Chapter 5, and the time it takes to compile this
package is what we call the "Static Binutils Unit" or "SBU". All other compile
times will be expressed relative to this time.</para>
<para>For example, the time it takes to build the static version of GCC is 3.9
SBU. This means that if on your system it took 10 minutes to compile and
install the static Binutils, then you know it will take nearly 40 minutes to
build the static GCC. Fortunately, most build times are much shorter than the
one of Binutils.</para>
<para>For example, the time it takes to build the static version of GCC is
&gcc-time-tools-pass1;s. This means that if on your system it took 10 minutes
to compile and install the static Binutils, then you know it will take
approximately 45 minutes to build the static GCC. Fortunately, most build times
are much shorter than the one of Binutils.</para>
<para>Note that SBUs don't work well for SMP-based machines. But if you're so
lucky as to have multiple processors, chances are that your system is so fast
that you don't mind.</para>
<para>Note that if the system compiler on your host is GCC-2 based, the SBUs
listed may end up being very inaccurate. This is because the SBU is based on
the very first package, compiled with the old GCC, while the rest of the
system is compiled with the newer GCC-&gcc-version; which is known to be
approximately 30% slower.</para>
<para>Also note that SBUs don't work well for SMP-based machines. But if you're
so lucky as to have multiple processors, chances are that your system is so fast
that you won't mind.</para>
</sect1>