I agree with Bob. This generally isn't possible with normal pc hardware.
Also, unloading a module doesn't necessarily stop the hardware using power.
Anton
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Anton Piatek
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On Dec 14, 2011 2:46 PM, "Bob Dunlop" <bob.dunlop@???> wrote:
> Hi,
>
> On Wed, Dec 14 at 10:33, James Courtier-Dutton wrote:
> > Hi,
> >
> > I have an aim to monitor as precisely as possible the power usages of
> > a number of servers.
>
> Like:
>
> # ioline-summary
> Data Out power: Bus Voltage 13.38 V
> Data Out power: Current 0.256 A
> Data Out power: Power 3.43 W
> External power outlet 0: Bus Voltage 12.87 V
> External power outlet 0: Current 0.002 A
> External power outlet 0: Power 0.02 W
> External power outlet 1: Bus Voltage 12.86 V
> External power outlet 1: Current -0.001 A
> External power outlet 1: Power -0.02 W
> Port A power: Bus Voltage 12.86 V
> Port A power: Current -0.069 A
> Port A power: Power -0.89 W
> Port C power: Bus Voltage 12.84 V
> Port C power: Current 0.001 A
> Port C power: Power 0.02 W
> Sensor power: Bus Voltage 12.87 V
> Sensor power: Current -0.001 A
> Sensor power: Power -0.02 W
>
>
> Sorry to tease, that's on a piece of non-PC equipment and uber expensive.
> Oh and Kelly wrote the interface so users can get graphs against time and
> other parameters such as temperature.
>
>
> Standard PC hardware doesn't normally allow you to monitor the current
> drawn from a supply, only the voltage, hence no way to determine the
> power consumption. Voltage was easy to measure so was thrown in to keep
> customers amused, but current would have cost a few pennies so wasn't.
>
> A few specialist suppliers and high end manufacturers do include current
> monitoring hardware. Look for ESA compatible power supplies for example.
>
>
> > I cannot seem to find any tools that monitor things like:
> > 1) Total power consumbed as a monotonic kWh value.
>
> Unless you've got one of those expensive monitorable power supplies your
> best bet is going to be a CurrentCost appliance monitor or similar.
>
>
> > 2) Power broken down by device within the system.
>
> Without the sensors to measure it software is only going to be able to give
> you the broadest stroke estimate. Again per device current sensors is
> rather specialist.
>
>
> > 3) Power broken down by process within the system.
>
> Even with hardware sensors ascribing power consumption to individual
> processes would be difficult. I guess you could look at a processes I/O
> stats then do something like 10% of disk I/O equals 10% of disk hardware
> power consumption.
>
>
> I think a lot of the monitoring software out there is smoke and mirrors
> on top of guesswork.
>
> --
> Bob Dunlop
>
> --
> Please post to: Hampshire@???
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