From owner-freebsd-current Thu Jul 9 21:55:36 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id VAA19948 for freebsd-current-outgoing; Thu, 9 Jul 1998 21:55:36 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from austin.polstra.com (austin.polstra.com [206.213.73.10]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id VAA19937 for ; Thu, 9 Jul 1998 21:55:11 -0700 (PDT) (envelope-from jdp@austin.polstra.com) Received: from austin.polstra.com (jdp@localhost) by austin.polstra.com (8.8.8/8.8.8) with ESMTP id VAA19584 for ; Thu, 9 Jul 1998 21:55:07 -0700 (PDT) (envelope-from jdp) Message-Id: <199807100455.VAA19584@austin.polstra.com> To: current@FreeBSD.ORG Subject: Does "make -j4 buildworld" actually help anybody? Date: Thu, 09 Jul 1998 21:55:07 -0700 From: John Polstra Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message