Date: Tue, 06 Sep 2011 17:22:02 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Bruce Cran <bruce@cran.org.uk> Cc: Garrett Cooper <yanegomi@gmail.com>, freebsd-current@freebsd.org, Alex Kozlov <spam@rm-rf.kiev.ua> Subject: Re: Unusually high LA without any load at FreeBSD9-BETA2 Message-ID: <74959.1315329722@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 06 Sep 2011 18:12:29 %2B0100." <4E66547D.2030907@cran.org.uk>
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In message <4E66547D.2030907@cran.org.uk>, Bruce Cran writes:
>On 06/09/2011 18:05, Garrett Cooper wrote:
>> What is "LA"?
>
>Load Average?
We should kille the load avarage as a measure for system activity,
it only has any relevance if you run heavy CPU bound processes.
If the majority of your threads yield their quantum, load average
contains absolutely no information of any relevance to system
capacity.
Try this:
main()
for (i = 0; i < 10000; i++)
start thread {
calculate time until top of next second
sleep (until then)
}
You'll see a monster load-avg on idle cpus.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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