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Date:      12 Nov 1999 00:01:18 +0100
From:      Assar Westerlund <assar@sics.se>
To:        Ben Rosengart <ben@skunk.org>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: make -jN world; how to determine optimal value of N?
Message-ID:  <5lzowk7hvl.fsf@foo.sics.se>
In-Reply-To: Ben Rosengart's message of "Thu, 11 Nov 1999 17:59:29 -0500 (EST)"
References:  <Pine.BSF.4.20.9911111758230.99311-100000@penelope.skunk.org>

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Ben Rosengart <ben@skunk.org> writes:
> D'oh -- I *meant* to add "besides trying different values and measuring"
> -- if I had that much time on my hands, I wouldn't be worrying about how
> long a make world takes.  :-)

I think trying to come up with a formula for calculating the optimal
value based on the amount of RAM, type of CPU, speed of CPU, version
of BSD, number, speeds, layout(s), previsous contents of *... etc is
really much harder than to measure it.  Other than that, I think the
`make -j4' suggested for a single CPU in the handbook is a fairly good
approximation.

/assar


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