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    René Ribaud
    @uggla
    I'm gonna have a look despite I'm not an expoert.
    René Ribaud
    @uggla
    There is a double and here : he can collect the metrics in different ways (sensors) and and
    measuring the power consumption of the virtual machines running on the host (working for Qemu/KVM so far) --> you should add a note saying that a "file" must be shared between host and guest.
    René Ribaud
    @uggla
    maybe a { that explains current problems to have a accurate measure (consumption measure in puclic cloud where the above file can not be shared, GPU, other devices not related with cpu). However you can say that even if the measure is not fully accurate it allows to have a good idea, compare different solutions, find ways to reduce consumption. In any case it is better than no measure at all. And of course we are working to improve it and people can join to help.
    René Ribaud
    @uggla
    You can also say that energy measurement was not really a concern especially in the DC, so hw are lacking a standard sensor solution to measure that. That's just disappointing to not be able to have device consumption of all hw parts in a standard/common way.
    bpetit
    @bpetit
    Thanks for the feedback !
    I get the ideas but I'm not sure about how to talk about those without going into too much details. (I'd like to keep the post short, and maybe write more detailled ones later)
    I fixed the typo btw, thanks !
    René Ribaud
    @uggla
    no pb, this is just suggestion, the main idea is to not give too much expectation to users as there are limitations to measure the consumption. And this is mainly due to hw.
    bpetit
    @bpetit
    I'm not that afraid to raise expectations, as it's pretty clear it's a moving project and that it's perfectible and open to contributions. The idea is also to create some impulse around those topics and try to make more people interested in contributing. So if they think something is possible and it's not yet or won't be. Maybe they'll leave, but they'll have a better idea of the topic, which could create movement later. And in the best case scenario, they may contribute :)
    I mean almost everything is virtually possible (on those topics at least), it's more about how much time and workforce is allocated to make it happen.
    René Ribaud
    @uggla
    ok anyway the blog post is good, so no worries.
    bpetit
    @bpetit
    thanks for the feedback and thanks for the ideas, it make me think more precisely about the next posts anyway :)
    Does someone have an idea on hubblo-org/scaphandre#59 ?
    I mean the person reporting can't load the intel_rapl kernel modules but sees files related to it in some folders named /lib/modules/5.4.0-62-generic/modules.order:XXXX:kernel
    on my machine (same OS but more recent kernel, the files are in:
    /lib/modules/5.8.0-38-generic/kernel/arch/x86/events/rapl.ko
    /lib/modules/5.8.0-38-generic/kernel/drivers/powercap/intel_rapl_common.ko
    /lib/modules/5.8.0-38-generic/kernel/drivers/powercap/intel_rapl_msr.ko
    I don't know what the modules.order:XXXXX folders are coming from
    Could this be related to some DKMS magic or something ?
    bpetit
    @bpetit
    I decided to ask you once I started reading patches in the kernel mailing list :laughing:
    Time to stop digging my own grave ! :D
    René Ribaud
    @uggla
    The guy seems to have a prompt with a '$'. Maybe stupid, but is he root ?
    bpetit
    @bpetit
    I didn't check but the Module rapl not found in directory error makes me think more about a link or reference missing. I have the same one if I try to load an inexistent module.
    René Ribaud
    @uggla
    yes I agree permission should rise a different msg.
    To my mind, it looks like he doesn't have the module file
    the locate does not output .ko files. (maybe not up2date)
    maybe the rapl is part of another pkg not installed can you check on your system ?
    bpetit
    @bpetit
    I did, and it was available by default, just not loaded. But I guess it can be different if you configure your distribution installation differently.
    René Ribaud
    @uggla
    he has not the same kernel as you older distro ?
    bpetit
    @bpetit
    same distro but he has an older kernel
    maybe he's using a kernel he compiled ? and didn't embed those drivers ?
    René Ribaud
    @uggla
    $ find /lib/modules/$(uname -r) -type f -name '*.ko' | grep rapl
    $
    files missing. unless wrong path
    so yes maybe he recompile the kernel and does not compile this module
    bpetit
    @bpetit
    I asked him, let's see.
    René Ribaud
    @uggla
    seems to be in extra before
    image.png
    I think he just need to install linux-modules-extra-5.4.0-26-generic
    bpetit
    @bpetit
    Oh yeah good catch. Maybe I had those by default :o
    I'll ask him thanks
    René Ribaud
    @uggla
    or they just add the module in the std package for updates.
    bpetit
    @bpetit
    maybe ! Thanks for the hint !
    I wonder why he would have "traces" of those kernel modules if he never installed the required package then Oo
    René Ribaud
    @uggla
    this is traces in the file : /lib/modules/5.4.0-62-generic/modules.order
    that should define the sequence to load module if needed
    so I think this is "normal"
    bpetit
    @bpetit
    Even if they are not present ?
    René Ribaud
    @uggla
    possible.
    bpetit
    @bpetit
    That's interesting. Let's see what come out of the issue.
    René Ribaud
    @uggla
    on fedora this is part of the man kernel pkg
    kernel-core
    At least maybe it something that could go into a troubleshooting section of the doco
    bpetit
    @bpetit
    yes definitely
    Florimond Manca
    @florimondmanca
    @bpetit The article is great. I like how you insist on systemic trends, like the democratization of autoscaling which broke apart the relationship between devs and the physicality of actual servers even further. I’m personally very wary of the idea that if we’re just « careful » in how we develop systems then it will be okay. We need to take into account things that go beyond individuals, so kudos to that. Also liked how you mentioned the limitations of measuring electricity consumption (« more to GHG than electricity ») and how you acknowledge at the beginning that the climate is only one aspect. I think in many existing developer oriented projects it has been a missing step to go beyond just climate change and open up the conversation about broader topics. Obviously the need for doing that for Scaphandre isn’t as clear since it’s an electricity consumption tool after all, but still it’s nice to have small bursts and hints of « let’s acknowledge it’s not just GHG or electricity and collectively extend the horizon a bit » :)