Changeset 3aee2ac2 for chapter04/aboutsbus.xml
- Timestamp:
- 08/24/2014 05:05:28 AM (10 years ago)
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chapter04/aboutsbus.xml
r729afb9 r3aee2ac2 37 37 numbers can vary by as much as dozens of minutes in some cases.</para> 38 38 39 <note><para>For many modern systems with multiple processors (or cores) the 40 compilation time for a package can be reduced by performing a "parallel make" 41 by either setting an environment variable or telling the 42 <command>make</command> program how many processors are available. For 43 instance, a Core2Duo can support two simultaneous processes with:</para> 39 <note> 40 <para>For many modern systems with multiple processors (or cores) the 41 compilation time for a package can be reduced by performing a "parallel 42 make" by either setting an environment variable or telling the 43 <command>make</command> program how many processors are available. For 44 instance, a Core2Duo can support two simultaneous processes with:</para> 44 45 45 <screen><userinput>export MAKEFLAGS='-j 2'</userinput></screen>46 <screen><userinput>export MAKEFLAGS='-j 2'</userinput></screen> 46 47 47 <para>or just building with:</para>48 <para>or just building with:</para> 48 49 49 <screen><userinput>make -j2</userinput></screen>50 <screen><userinput>make -j2</userinput></screen> 50 51 51 <para>When multiple processors are used in this way, the SBU units in the 52 book will vary even more than they normally would. Analyzing the output of 53 the build process will also be more difficult because the lines of different 54 processes will be interleaved. If you run into a problem with a build step, 55 revert back to a single processor build to properly analyze the error 56 messages.</para> 57 52 <para>When multiple processors are used in this way, the SBU units in the 53 book will vary even more than they normally would. In some cases, the make 54 step will simply fail. Analyzing the output of the build process will also 55 be more difficult because the lines of different processes will be 56 interleaved. If you run into a problem with a build step, revert back to a 57 single processor build to properly analyze the error messages.</para> 58 58 </note> 59 59
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