- Timestamp:
- 08/25/2024 10:30:13 PM (7 weeks ago)
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- multilib, xry111/multilib
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- d2eb97b
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- 1d6a2e2 (diff), 04befc5e (diff)
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chapter04/aboutsbus.xml
r1d6a2e2 r3eb188e 37 37 numbers can vary by as much as dozens of minutes in some cases.</para> 38 38 39 <para>Before measuring the build time of any package (no matter Binutils 40 pass 1 or a package of which the SBU is being measured), make sure a 41 system power profile suitable to make the system running with the 42 maximum performance (and the maximum power consumption) is selected. Or 43 the measured SBU value may be severly inaccurate because the system may be 44 operated differently building Binutils pass 1 and the other package. 45 Be aware that a significant inaccuracy can still show up even if the same 46 profile (except one maximizing the performance) is used for both packages: 47 the system may respond slower for <quote>saving the power</quote> building 48 Binutils pass 1, because the system load seems only about 25% of the load 49 building the other package (with <parameter>-j4</parameter>).</para> 50 51 <para>On most distros the power profile can be managed with either 52 <command>power-profiles-daemon</command> or <command>tuned</command>. 53 If the distro runs <command>power-profiles-daemon</command>, issue the 54 <command>powerprofilesctl set performance</command> command to select 55 the <literal>performance</literal> profile. If the distro runs 56 <command>tuned</command>, issue the <command>tuned-adm profile 57 throughput-performance</command> command to select the 58 <literal>throughput-performance</literal> profile.</para> 59 60 <para>Even if you are not measuring the SBU values, it's still better to 61 select the power profile for maximum performance before building LFS, as 62 doing so can (obviously) make the system faster to build LFS 63 packages.</para> 64 39 65 <note> 40 66 <para>When multiple processors are used in this way, the SBU units in the … … 48 74 times in Chapter 8 also include the time to run the regression tests for 49 75 the package unless specified otherwise.</para> 50 51 76 </note> 52 77
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