Date: Thu, 09 Jul 1998 21:55:07 -0700 From: John Polstra <jdp@polstra.com> To: current@FreeBSD.ORG Subject: Does "make -j4 buildworld" actually help anybody? Message-ID: <199807100455.VAA19584@austin.polstra.com>
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I recently got what I thought would be a perfect box to take advantage
of "make -j4": a PII/400 with 128 MB of RAM. But "-j4" slows things
down considerably. Under identical conditions, the timings were:
Without -j4:
real 47m14.643s
user 36m7.531s
sys 12m20.942s
With -j4:
real 55m59.989s
user 34m50.985s
sys 12m54.567s
This is a "make -DNOCLEAN buildworld" with an empty, async-mounted
/usr/obj on a different spindle than /usr/src.
Have any of you actually measured an improvement from using "-j4"?
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Self-knowledge is always bad news." -- John Barth
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