Laurence Sanford wrote:
Rob wrote:

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With these simple tests, I come to the conclusion that
"make -j$n buildworld" is best with n = number of CPUs.
Does that make sense?

Rob.

This is what I've been telling people and using myself for years. However, I've been shot down on this several times, so I just leave everyone alone and let them do their own thing. You and I will be getting it done a little faster though.

Not really faster, but higher values do not make a difference, well, as long as the extra processes do not force the use of swap. Intensified swapping because of a high -j value slows down the build considerably.

I don't understand why this is reason for debate. My test has
obvious results on various of my PCs, and was very quickly done:
I wrote a script with a loop that built the world again and
again, doing a 'touch' to a file immediately before and after
the build. Got all my data within a day or so.

Rob.


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