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	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	Many people would like to know beforehand approximately how long it takes to compile and install each package. Because Linux From Scratch can be built on many different systems, it is impossible to provide absolute time estimates. The biggest package (gcc) will take approximately 5 minutes on the fastest systems, but could take days on slower systems! Instead of providing actual times, the Standard Build Unit (SBU) measure will be used instead.	许多人想在编译和安装各个软件包之前，了解这一过程大概需要多少时间。由于 Linux From Scratch 可以在许多不同系统上构建，我们无法直接给出估计时间。例如，最大的软件包 (Glibc) 在最快的系统上只要大约 20 分钟就能构建好，而在一些较慢的系统上需要 3 天！因此，我们不提供实际时间，而是以标准构建单位 (SBU) 衡量时间。
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	The SBU measure works as follows. The first package to be compiled is binutils in <xref linkend="chapter-cross-tools"/>. The time it takes to compile using one core is what we will refer to as the Standard Build Unit or SBU. All other compile times will be expressed in terms of this unit of time.	下面给出标准构建单位的测量方法。本书中构建的第一个软件包是 <xref linkend="chapter-cross-tools"/> 中的 Binutils，定义编译它需要的时间为标准构建单位，缩写为 SBU。其他软件包的编译时间用 SBU 为单位表示。
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	For example, consider a package whose compilation time is 4.5 SBUs. This means that if your system took 4 minutes to compile and install the first pass of binutils, it will take <emphasis>approximately</emphasis> 18 minutes to build the example package. Fortunately, most build times are shorter than one SBU.	例如，考虑一个编译时间是 4.5 SBU 的软件包。如果在某个系统上，需要 10 分钟来编译和安装第一轮的 Binutils，那么<emphasis>大概</emphasis>需要 45 分钟才能构建这个软件包。幸运的是，多数软件包构建时间比 Binutils 少。
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	SBUs are not entirely accurate because they depend on many factors, including the host system's version of GCC. 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.	一般来说，SBU 不是完全准确的。这是由于它受到许多因素的影响，包括宿主系统的 GCC 版本。SBU 只能用来估计安装一个软件包可能需要的时间，估计结果的误差在个别情况下可能达到几十分钟。
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	On some newer systems, the motherboard is capable of controlling the system clock speed. This can be controlled with a command such as <command>powerprofilesctl</command>. This is not available in LFS, but may be available on the host distro. After LFS is complete, it can be added to a system with the procedures at the <ulink url='&blfs-book;sysutils/power-profiles-daemon.html'> BLFS power-profiles-daemon</ulink> page. Before measuring the build time of any package it is advisable to use a system power profile set for maximum performance (and maximum power consumption). Otherwise the measured SBU value may be inaccurate because the system may react differently when building <xref linkend='ch-tools-binutils-pass1'/> or other packages. Be aware that a significant inaccuracy can still show up even if the same profile is used for both packages because the system may respond slower if the system is idle when starting the build procedure. Setting the power profile to <quote>performance</quote> will minimize this problem. And obviously doing so will also make the system build LFS faster.
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	If <command>powerprofilesctl</command> is available, issue the <command>powerprofilesctl set performance</command> command to select the <literal>performance</literal> profile. Some distros provides the <command>tuned-adm</command> command for managing the profiles instead of <command>powerprofilesctl</command>, on these distros issue the <command>tuned-adm profile throughput-performance</command> command to select the <literal>throughput-performance</literal> profile.
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	When multiple processors are used in this way, the SBU units in the book will vary even more than they normally would. In some cases, the make step will simply fail. Analyzing the output of the build process will also be more difficult because the lines from different processes will be interleaved. If you run into a problem with a build step, revert to a single processor build to properly analyze the error messages.	用这种方式使用多个处理器时，SBU 值将会发生变化，有时甚至变得比正常值还大。某些情况下，还会导致 make 命令失败。另外，分析构建过程的的输出也会变得困难，因为不同进程的输出行会交错在一起。如果在构建过程中出现问题，需要使用单处理器进行构建，才能更好地分析错误消息。
	Linux From Scratch 12.3/chapter04_aboutsbus — Chinese (Simplified Han script)	The times presented here for all packages (except <xref linkend='ch-tools-binutils-pass1'/> which is based on one core) are based upon using four cores (-j4). The times in Chapter 8 also include the time to run the regression tests for the package unless specified otherwise.