Date: Thu, 22 Sep 2011 17:59:36 -0300 From: Rodrigo Gonzalez <rjgonzale@estrads.com.ar> To: freebsd-questions@freebsd.org Subject: Re: load average with multi-core CPU's Message-ID: <4E7BA1B8.5070109@estrads.com.ar> In-Reply-To: <op.v175r5oh34t2sn@cr48.lan> References: <CAK1r8CX_c3Rap4GfqbzV%2BA9QBaWq%2BwJ-h-K44gFVJYeS6wY=0w@mail.gmail.com> <op.v175r5oh34t2sn@cr48.lan>
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On 09/22/2011 04:29 PM, Mark Felder wrote: > On Thu, 22 Sep 2011 10:22:43 -0500, Henry M <henry95@gmail.com> wrote: > >> Hi all, >> >> Can someone explain, or point me to correct documentation on what the >> load >> average on top/uptime is actually displaying? > > Load average is "average number of processes in the run queue" for the > 1, 5, and 15 minute intervals. If you have a quad core CPU a 4.00 load > average means you've been keeping the CPU busy at 100%. Not exactly as I understand it....IO (disk, network or whatever) affects it too... 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 I think there are other things that affect load average but are over my current knowledge... Regards Rodrigo Gonzalez
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