Date: Fri, 22 Jul 2005 15:48:46 +0200 From: Angelo Turetta <aturetta@commit.it> To: Karl Denninger <karl@denninger.net> Cc: freebsd-stable@freebsd.org Subject: make -j as a stress test (was: Re: Quality of FreeBSD) Message-ID: <42E0F93E.7000108@commit.it> In-Reply-To: <20050722010611.GA72234@FS.denninger.net> References: <200507211803.j6LI34dV005050@ferens.net> <20050721194500.W9208@fledge.watson.org> <20050721192613.GA61902@FS.denninger.net> <6.2.1.2.0.20050721153750.0851fab0@64.7.153.2> <20050721202234.GA62615@FS.denninger.net> <20050722004340.H16902@fledge.watson.org> <20050722001253.GA70277@FS.denninger.net> <20050722013605.U16902@fledge.watson.org> <20050722010611.GA72234@FS.denninger.net>
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Karl Denninger wrote:
> As I pointed out in my PR, "make -j4 buildworld" is more than sufficient
> to demonstrate the problem.
( ... )
> I'll pull over 6.0-BETA1, rebuild the array (that is the time-consuming
> part of this test - takes 6-8 hours for the rebuild to run) and see if it
> fails during a buildworld.
Maybe I'm wrong, but in my tests I had the impression that RELENG_6
includes the phk's update to make which corrects the -j behaviour.
In 4.x and 5.x, every submake will spawn up to n tasks (n being the
number provided with -j), and a buildworld -j4 in UP hardware easily
produces a 2 digits system load.
That's not more the case with 6.x (if I'm not wrong), in my test
buildworld -j4 puts the load right near 4.
So I hope you have other ways to test the new ATA, as make buildworld
might not more be the monster it used to be.
Angelo Turetta
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