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Cortex A72, the arm core used in Raspberry Pi 4 is not on the support list of libpfm. It seems the PMU of Cortex A72 is similar to Cortex A57, so you can add support for Cortex A72 by duplicating the code for Cortex A57. Here is a patch I made on papi 6.0.0.1 release, so after clone the repo, git checkout to tag papi-6-0-0-1-t, then git am to apply this ...


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The other user didn't really answer the question asked, about what usb to ethernet adapters work with the Raspberry Pi 4. Here are some forum links I found that may help. I don't have a RPi 4 myself (yet!) so I can't confirm, but it seems that most adapters will work fine, with maybe a slightly more limited speed. For physical devices what counts on Linux ...


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The number of server processes it is possible to have running in parallel is not a meaningful constraint, unless some of those processes require unusual amounts of memory even when doing nothing, which generally speaking server processes do not. The constraint is how much those servers can do in parallel; you could overwhelm the Pi with only one given ...


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