energy.1 - energy - measure energy usage
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       energy.1 (871B)
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            1 .Dd 2023
            2 .Dt ENERGY 1
            3 .Os
            4 .
            5 .Sh NAME
            6 .Nm energy
            7 .Nd measure energy usage of command
            8 .
            9 .Sh SYNOPSIS
           10 .Nm
           11 .Bk -words
           12 .Ar COMMAND...
           13 .Ek
           14 .
           15 .Sh DESCRIPTION
           16 .Bd -filled
           17 .Nm
           18 shows the energy usage of a command, similarly to how
           19 .Xr time 1
           20 shows the time usage.  The energy usage is printed to stderr and
           21 reported in joules.
           22 .Nm
           23 automatically attempts to use whatever sensors are available.
           24 Battery-based measurements are only used if the battery is
           25 discharging.
           26 .
           27 .Sh BUGS
           28 Yes.
           29 .Nm
           30 depends crucially on hardware counters, and there is no guarantee
           31 these are an accurate reflection of the actual physical energy usage.
           32 Apart from plain inaccuracy, the available counters may cover only a
           33 subset of the hardware available in the system, and may not count the
           34 energy usage of e.g. graphics cards or storage devices.
           35 .
           36 .Sh LICENSE
           37 This program is released under the GPLv3 or later.