Date: Mon, 26 Sep 2011 17:13:24 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: load average with multi-core CPU's Message-ID: <j5q4rg$24t$1@dough.gmane.org> In-Reply-To: <4E7BA1B8.5070109@estrads.com.ar> References: <CAK1r8CX_c3Rap4GfqbzV%2BA9QBaWq%2BwJ-h-K44gFVJYeS6wY=0w@mail.gmail.com> <op.v175r5oh34t2sn@cr48.lan> <4E7BA1B8.5070109@estrads.com.ar>
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On 22/09/2011 22:59, Rodrigo Gonzalez wrote:
> It is the number of task waiting in queue to be run....but IO is
> important...if 2 processes are waiting for IO and it is completely
> saturated they will be kept in queue so load will get higher
No, this is how Linux does the calculation. For FreeBSD, if a process is
waiting or IO, it is sleeping and thus not runnable.
Linux has the "iowait" ("w") state in addition to usr/sys/idle states
and counts processes waiting for IO as runnable - which never made sense
to me as it is counting apples as oranges. (yes, IO saturation is
important for server status but it needs to be inspected separately -
the LA number is too coarse for this).
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