Changeset 0dc87e0 for chapter02

Timestamp:

10/21/2003 12:38:06 AM (21 years ago)

Author:

Greg Schafer <greg@…>

Branches:

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, 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/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc

Children:

5bb6de8

Parents:

1a38cda

Message:

Add clarifying paragraph about SBUs.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3016 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:

• chapter02/aboutsbus.xml (modified) (1 diff)

chapter02/aboutsbus.xml

@@ -17 +17 @@
 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>