msgid "" msgstr "" "Project-Id-Version: PACKAGE VERSION\n" "POT-Creation-Date: 2020-06-17 12:44+0800\n" "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" "Last-Translator: FULL NAME \n" "Language-Team: LANGUAGE \n" "Language: zh_CN\n" "MIME-Version: 1.0\n" "Content-Type: text/plain; charset=UTF-8\n" "Content-Transfer-Encoding: 8bit\n" "X-Generator: Translate Toolkit 2.2.5\n" #. type: Content of: #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:11 msgid "About SBUs" msgstr "关于 SBU" #. type: Content of: <sect1><para> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:13 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> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:22 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> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:28 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> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:34 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> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:40 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> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:46 msgid "<userinput>export MAKEFLAGS='-j4'</userinput>" msgstr "<userinput>export MAKEFLAGS='-j4'</userinput>" #. type: Content of: <sect1><note><para> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:48 msgid "or just building with:" msgstr "或者直接用以下命令构建：" #. type: Content of: <sect1><note><screen> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:50 msgid "<userinput>make -j4</userinput>" msgstr "<userinput>make -j4</userinput>" #. type: Content of: <sect1><note><para> #: /home/xry111/svn-repos/LFS-BOOK/chapter04/aboutsbus.xml:52 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。"