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Date:      13 Feb 2001 03:55:28 +0100
From:      Dag-Erling Smorgrav <des@ofug.org>
To:        kstewart@urx.com
Cc:        Matt Dillon <dillon@earth.backplane.com>, Greg Lehey <grog@lemis.com>, Danny Braniss <danny@cs.huji.ac.il>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: soft updates performance
Message-ID:  <xzpy9vbl2an.fsf@flood.ping.uio.no>
In-Reply-To: Kent Stewart's message of "Mon, 12 Feb 2001 18:44:25 -0800"
References:  <E14RurO-0000Zl-00@cs.huji.ac.il> <xzp7l2wc6v6.fsf@flood.ping.uio.no> <20010213095300.D2178@wantadilla.lemis.com> <xzp3ddjpjlk.fsf@flood.ping.uio.no> <200102122343.f1CNhd053320@earth.backplane.com> <3A887EB3.6BDD7648@urx.com> <200102130149.f1D1nDr66705@earth.backplane.com> <3A889F89.8CDD507F@urx.com>

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Kent Stewart <kstewart@urx.com> writes:
> One other point that I would like to understand is why -j4 takes
> longer on all of my systems. That goes against what everyone claims
> should happen.

More concurrent jobs means more contention and more overhead.
Increasing the number of jobs boosts performance to a certain point;
past this point, performance starts decreasing again.

DES
-- 
Dag-Erling Smorgrav - des@ofug.org


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