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#. type: Content of: <sect1><title>
msgid "About SBUs"
msgstr "关于 SBU"

#. type: Content of: <sect1><para>
msgid ""
"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 accurate time estimates. "
"The biggest package (Glibc) will take approximately 20 minutes on the "
"fastest systems, but could take up to three days on slower systems! Instead "
"of providing actual times, the Standard Build Unit (SBU) measure will be "
"used instead."
msgstr ""
"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。"

#. type: Content of: <sect1><para>
msgid ""
"The SBU measure works as follows. The first package to be compiled from this "
"book is binutils in <xref linkend=\"chapter-cross-tools\"/>. The time it "
"takes to compile this package is what will be referred to as the Standard "
"Build Unit or SBU. All other compile times will be expressed relative to "
"this time."
msgstr ""
"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。"

#. type: Content of: <sect1><para>
msgid ""
"For example, consider a package whose compilation time is 4.5 SBUs. This "
"means that if a system took 10 minutes to compile and install the first pass "
"of binutils, it will take <emphasis>approximately</emphasis> 45 minutes to "
"build this example package.  Fortunately, most build times are shorter than "
"the one for binutils."
msgstr ""
"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。"

#. type: Content of: <sect1><para>
msgid ""
"In general, 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."
msgstr ""
"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。"

#. type: Content of: <sect1><note><para>
msgid ""
"For many modern systems with multiple processors (or cores) the compilation "
"time for a package can be reduced by performing a \"parallel make\" by "
"either setting an environment variable or telling the <command>make</"
"command> program how many processors are available.  For instance, an Intel "
"i5-6500 CPU can support four simultaneous processes with:"
msgstr ""
"对于许多拥有多个处理器 (或处理器核心) 的现代系统，可以显著缩短软件包的编译时"
"间，设置环境变量或者直接告诉 <command>make</command> 命令有多少个可用的处理"
"器，即可进行并行构建。例如，一块 Intel i5-6500 CPU 可以支持 4 个同时运行的进"
"程，可以设定："

#. type: Content of: <sect1><note><screen>
#, no-wrap
msgid "<userinput>export MAKEFLAGS='-j4'</userinput>"
msgstr "<userinput>export MAKEFLAGS='-j4'</userinput>"

#. type: Content of: <sect1><note><para>
msgid "or just building with:"
msgstr "或者直接用以下命令构建："

#. type: Content of: <sect1><note><screen>
#, no-wrap
msgid "<userinput>make -j4</userinput>"
msgstr "<userinput>make -j4</userinput>"

#. type: Content of: <sect1><note><para>
msgid ""
"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 of different processes will be "
"interleaved.  If you run into a problem with a build step, revert back to a "
"single processor build to properly analyze the error messages."
msgstr ""
"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。"