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* Update "About SBUs" section to reflect the earlier fix for bug 1061

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@4744 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Matthew Burgess 2005-03-13 22:56:18 +00:00
parent 6581f03ca8
commit 67c35bd573
2 changed files with 16 additions and 22 deletions
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3
chapter01/changelog.xml
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@ -82,6 +82,9 @@ first a summary, then a detailed log.</para>
</itemizedlist> </itemizedlist>
</listitem> </listitem>
<listitem><para>March 13, 2005 [matt]: Reword About SBUs section to reflect the
earlier fix for bug 1061</para></listitem>
<listitem><para>March 13, 2005 [matt]: Dynamically link the pass1 toolchain to <listitem><para>March 13, 2005 [matt]: Dynamically link the pass1 toolchain to
workaround bug 1061 and remove all related explanatory text</para></listitem> workaround bug 1061 and remove all related explanatory text</para></listitem>

35
chapter04/aboutsbus.xml
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@ -13,38 +13,29 @@ Scratch can be built on many different systems, it is impossible to
provide accurate time estimates. The biggest package (Glibc) will provide accurate time estimates. The biggest package (Glibc) will
take approximately 20 minutes on the fastest systems, but could take take approximately 20 minutes on the fastest systems, but could take
up to three days on slower systems! Instead of providing actual times, up to three days on slower systems! Instead of providing actual times,
the Static Build Unit (SBU) measure will be the Standard Build Unit (SBU) measure will be
used instead.</para> used instead.</para>
<para>The SBU measure works as follows. The first package to be compiled <para>The SBU measure works as follows. The first package to be compiled
from this book is the statically-linked Binutils in <xref from this book is Binutils in <xref linkend="chapter-temporary-tools"/>. The
linkend="chapter-temporary-tools"/>. The time it takes to compile time it takes to compile this package is what will be referred to as the
this package is what will be referred to as the Static Build Unit Standard Build Unit or SBU. All other compile times will be expressed relative
or SBU. All other compile times will be expressed relative to this to this time.</para>
time.</para>
<para>For example, consider a package whose compilation time is 4.5 <para>For example, consider a package whose compilation time is 4.5
SBUs. This means that if a system took 10 minutes to compile and SBUs. This means that if a system took 10 minutes to compile and
install the static Binutils, it will take install the first pass of Binutils, it will take
<emphasis>approximately</emphasis> 45 minutes to build this example <emphasis>approximately</emphasis> 45 minutes to build this example package.
package. Fortunately, most build times are shorter than the one Fortunately, most build times are shorter than the one for Binutils.</para>
for Binutils.</para>
<para>Please note that if the system compiler on the host is GCC-2.x based, the <para>In general, SBUs are not entirely accurate because they depend on many
SBUs listed may be somewhat understated. This is because the SBU is factors, not just the GCC version. Note that on Symmetric Multi-Processor
based on the very first package, compiled with the old GCC, while the (SMP)-based machines, SBUs are even less accurate. They are provided here to
rest of the system is compiled with the newer GCC-&gcc-version; (which is give an estimate of how long it might take to install a package, but the numbers
known to be approximately 30 percent slower). SBUs are also not can vary by as much as dozens of minutes in some cases.</para>
highly accurate for Symmetric Multi-Processor (SMP)-based machines.</para>
<para>To view actual timings for a number of specific machines, we recommend <para>To view actual timings for a number of specific machines, we recommend
<ulink url="&lfs-root;~bdubbs/"/>.</para> <ulink url="&lfs-root;~bdubbs/"/>.</para>
<para>In general, SBUs are not very accurate because they depend on many
factors, not just the GCC version. They are provided
here to give an estimate of how long it might take to
install a package, but the numbers can vary by as much as dozens of
minutes in some cases.</para>
</sect1> </sect1>