Date: Mon, 25 May 2009 15:31:23 -0400 From: Glen Barber <glen.j.barber@gmail.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org, Peter Boosten <peter@boosten.org> Subject: Re: How can this 'top' command output make sense? Load over 7 and total CPU use ~5% Message-ID: <4ad871310905251231x8c61c93j97bf364ebea8d533@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.0905252119520.41069@wojtek.tensor.gdynia.pl> References: <200905241315.n4ODFB96007801@mp.cs.niu.edu> <b79ecaef0905250104p55c302cdh102202d1a06a389b@mail.gmail.com> <alpine.BSF.2.00.0905251013500.36458@wojtek.tensor.gdynia.pl> <b79ecaef0905250133n5cd641dv6ca8e088f8fa2f33@mail.gmail.com> <4A1A58FA.60303@boosten.org> <alpine.BSF.2.00.0905251912000.40022@wojtek.tensor.gdynia.pl> <C9B964A3-BE91-4518-B13C-EE28282FD810@boosten.org> <alpine.BSF.2.00.0905252107590.40989@wojtek.tensor.gdynia.pl> <1932D812-03CF-48AF-A306-669C39862EB7@boosten.org> <alpine.BSF.2.00.0905252119520.41069@wojtek.tensor.gdynia.pl>
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On Mon, May 25, 2009 at 3:24 PM, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote: >> >> The CPU will perform the same, whether at 10% utilization, or at 100% >> utilization, the system however won't. >> That's the difference between load and utilization. > > still don't understand you. > > CPU will not perform the same at 10% utilization, it will perform 10 times > less than at 100% utilization. > You are assuming this based on what? > CPU load == CPU utilization == how big percentage of time CPU (or CPUs by > average) are doing anything except being in idle loop or hlt/waiting for > interrupt. > it's exactly the same words in that context. > Not true. top(1) can fully utilize the CPU. Doing so does not put the system under full load. > > load average is how much processes (by average) is not doing calculations > because something is not yet available and depends of computer resources(*) > - like CPU time, disk I/O results etc.. > > (*) - for example waiting on tty read is not calculated to load average as > it's depends on human not computer. What? -- Glen Barber
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