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On Mon, Dec 4, 2017 at 10:11 PM, Taiidan@×××.com <Taiidan@×××.com> wrote: |
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> On my 16 core opteron I have to do -j32 or sometimes -j64 to be using |
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> everything all the time, is this normal? If I don't do this it won't be |
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> pegged at 100% all the time. |
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> |
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I use a ramdisk and anything over -j${NCPU} (incl. hyperthreaded |
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cores) causes performance degradation in general due mainly to the |
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compiling step. For some package sets I have noticed that higher build |
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parallelism helps due to some ebuild steps not being easily |
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parallelizable. |
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> I assume using a ramdisk would help with this? I wouldn't want to do a SSD |
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> as I assume it would excessively wear by doing compiles. |
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> |
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It should. While builds on an SSD will wear the SSD, comparing the |
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write volume to the expected drive lifetime will tell you the true |
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impact. It is (if I remember) still relatively small. |
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Cheers, |
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R0b0t1 |
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