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Dnia czwartek, 28 wrze¶nia 2006 09:24, Petter Haggholm napisa³: |
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> contrast to all the recommended settings I have seen so far -- standard |
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> procedure seems to be -j$(no. cores+1), I presume so that one make |
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Ah, yes - one more thing. The estimation of -j for multi-core i've seen in |
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various manuals varies from mentioned here #cores+1 up to 2*#cores. IMHO it |
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depends on the very application being compiled. |
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* for large amount of small sources the I/O time is comparable to CPU time. In |
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this case higher -j values are reasonable, as they overlay IO of one file |
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with compilation of the another. As size of the files decreases, the -j may |
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be increased |
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* for small amount of big sources the CPU time takes significantly longer than |
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IO time (and memory constraints become more important), so high -j values |
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just cause time expensive process switching between concurent long-term |
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compilations (and might eat all the memory as in my case) |
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-- |
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Pawel Kraszewski |
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www.kraszewscy.net |
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-- |
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gentoo-amd64@g.o mailing list |
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