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On Thursday 27 January 2011 19:56:23 Allan Gottlieb wrote: |
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> On Thu, Jan 27 2011, Neil Bothwick wrote: |
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> > On Thu, 27 Jan 2011 17:09:27 +0200, Nikos Chantziaras wrote: |
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> >> > So on a 20 package world update, only 19 are faster while the 20th |
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> >> > runs at the same speed? Where's the loss there? Even if the last were |
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> >> > slower, it would be worth it. |
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> >> |
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> >> Given the amount of time unpack/configure/install of most packages |
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> >> needs (very short), my observation is that it would not be worth it. |
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> > |
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> > Even if that were true, how much time would you have to save to justify |
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> > adding -j 2 to EMERGE_DEFAULTS in make.conf? |
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> > |
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> > But it's not true, large packages spend a lot of time on these phases of |
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> > the install. |
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> |
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> OK I'm convinced since I know that those phases do take noticeable time. |
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> |
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> I have a "4" processor i7 model 620 (2 cores, doubled for |
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> hyperthreading) and have set MAKEOPTS="-j5". |
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> If I add -jobs=2 to EMERGE_DEFAULT_OPTS, should I lower |
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> MAKEOPTS to 3 (to 4)? |
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> |
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> thanks, |
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> allan |
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You could, as if you leave it at -j5, you can end up with 2 * 5 = 10 |
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processed, eg: similar as if running with MAKEOPTS="-j10" |
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I think the option that YoYo came with is a good compromise: |
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# MAKEOPTS="-j -l5" emerge -j --load-average=5 |
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Next time I am doing a big upgrade, I'm going to test that to see how it |
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behaves. |
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-- |
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Joost |
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