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comment Non-Root Package Managers
@PiotrDobrogost to some extend yes, to some extend no. For example there is no environment variable for /etc or (according to my knowledge) /usr/lib/<packagename>/ or /usr/libexec/<packagename>/. /usr/share can be changed by XDG variables which has been released sometime in this century and are not necessarily adopted for older programs.
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comment Why I can not use all the 100% potential of CPU?
"A common problem is accessing your data in a way that causes lots of cache misses. Your multiple cores may also share a L3 cache and if they are all working on different data you are probably running into a lot of misses there." - as $ misses are transparent to processor I'd imagine they would be counted as CPU utilization in top as they are transparent to application/OS (setting aside profilers such as cachegrind) - even though it is I/O from CPU POV.
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comment How to set up properly zram and swap
By default max_comp_streams seems to be 1 according to documentation. I haven't checked if that parameter existed in 2011 but it seems to be a better option then multiple swap files.
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accepted How to setup permission for virtfs in system libvirtd
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