Changeset 6a3b6af for chapter04/aboutsbus.xml
- Timestamp:
- 01/15/2006 12:10:43 PM (18 years ago)
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- 3467c02f
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- b0ed1af
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chapter04/aboutsbus.xml
rb0ed1af r6a3b6af 1 1 <?xml version="1.0" encoding="ISO-8859-1"?> 2 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ 2 <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" 3 "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ 3 4 <!ENTITY % general-entities SYSTEM "../general.ent"> 4 5 %general-entities; 5 6 ]> 7 6 8 <sect1 id="prepare-aboutsbus"> 7 <title>About SBUs</title> 8 <?dbhtml filename="aboutsbus.html"?> 9 <?dbhtml filename="aboutsbus.html"?> 9 10 10 <para>Many people would like to know beforehand approximately how long 11 it takes to compile and install each package. Because Linux From 12 Scratch can be built on many different systems, it is impossible to 13 provide accurate time estimates. The biggest package (Glibc) will 14 take approximately 20 minutes on the fastest systems, but could take 15 up to three days on slower systems! Instead of providing actual times, 16 the Standard Build Unit (SBU) measure will be 17 used instead.</para> 11 <title>About SBUs</title> 18 12 19 <para>The SBU measure works as follows. The first package to be compiled 20 from this book is Binutils in <xref linkend="chapter-temporary-tools"/>. The 21 time it takes to compile this package is what will be referred to as the 22 Standard Build Unit or SBU. All other compile times will be expressed relative 23 to this time.</para> 13 <para>Many people would like to know beforehand approximately how long 14 it takes to compile and install each package. Because Linux From 15 Scratch can be built on many different systems, it is impossible to 16 provide accurate time estimates. The biggest package (Glibc) will 17 take approximately 20 minutes on the fastest systems, but could take 18 up to three days on slower systems! Instead of providing actual times, 19 the Standard Build Unit (SBU) measure will be 20 used instead.</para> 24 21 25 <para>For example, consider a package whose compilation time is 4.5 26 SBUs. This means that if a system took 10 minutes to compile and 27 install the first pass of Binutils, it will take28 <emphasis>approximately</emphasis> 45 minutes to build this example package. 29 Fortunately, most build times are shorter than the one for Binutils.</para>22 <para>The SBU measure works as follows. The first package to be compiled 23 from this book is Binutils in <xref linkend="chapter-temporary-tools"/>. The 24 time it takes to compile this package is what will be referred to as the 25 Standard Build Unit or SBU. All other compile times will be expressed relative 26 to this time.</para> 30 27 31 <para>In general, SBUs are not entirely accurate because they depend on many 32 factors, including the host system's version of GCC. Note that on Symmetric 33 Multi-Processor (SMP)-based machines, SBUs are even less accurate. They are 34 provided here to give an estimate of how long it might take to install a 35 package, but the numbers can vary by as much as dozens of minutes in some 36 cases.</para> 28 <para>For example, consider a package whose compilation time is 4.5 29 SBUs. This means that if a system took 10 minutes to compile and 30 install the first pass of Binutils, it will take 31 <emphasis>approximately</emphasis> 45 minutes to build this example package. 32 Fortunately, most build times are shorter than the one for Binutils.</para> 37 33 38 <para>To view actual timings for a number of specific machines, we recommend 39 The LinuxFromScratch SBU Home Page at <ulink url="&lfs-root;~bdubbs/"/>.</para> 34 <para>In general, SBUs are not entirely accurate because they depend on many 35 factors, including the host system's version of GCC. Note that on Symmetric 36 Multi-Processor (SMP)-based machines, SBUs are even less accurate. They are 37 provided here to give an estimate of how long it might take to install a 38 package, but the numbers can vary by as much as dozens of minutes in some 39 cases.</para> 40 41 <para>To view actual timings for a number of specific machines, we recommend 42 The LinuxFromScratch SBU Home Page at <ulink url="&lfs-root;~bdubbs/"/>.</para> 40 43 41 44 </sect1>
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