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Am Fr den 28. Sep 2018 um 5:19 schrieb Walter Dnes: |
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> On Tue, Sep 25, 2018 at 02:25:50PM +0100, Klaus Ethgen wrote |
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> > I have set MAKEOPTS="-j3" in my make.conf. |
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> I assume you have 2 cores on your cpu and you're adding 1 as per the |
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> ancient rule. |
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True. |
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> That may not be the best option anyways. See |
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> https://blogs.gentoo.org/ago/2013/01/14/makeopts-jcore-1-is-not-the-best-optimization/ |
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> The author of the blog post ran multiple tests, and concluded that |
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> setting MAKEOPTS -j to the actual number of cores is slightly faster. |
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> Years ago, the gcc compiler was less efficient, and adding 1 to -j did |
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> improve compilation speed. That is apparently not the case today. |
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Interesting thoughts. |
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First, cpufreq-set seems to be not available on gentoo anymore. Doesn't |
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matter, just giving it a try. |
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It came out, that all build times have nearly the same sys times but the |
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user and real times vary. Funny, this is a two CPU machine but the build |
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with -j1 consumes the least user time. Just the real value gives the |
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same pattern than on the site. |
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Regards |
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Klaus |
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- -- |
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Klaus Ethgen http://www.ethgen.ch/ |
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pub 4096R/4E20AF1C 2011-05-16 Klaus Ethgen <Klaus@××××××.ch> |
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Fingerprint: 85D4 CA42 952C 949B 1753 62B3 79D0 B06F 4E20 AF1C |
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