Comments - Getting Started with MyRocks
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There seems to be something strange happening on debian 9 in virtualized enviroments, when using D9 with cfq I/O scheduler - it's easily able to saturate 3 CPU cores with I/O wait even on Samsung 950 PRO when doing nothing with very low . Switching to noop or deadline scheduler helps and I/O wait drops to be almost on par with other engines (2-5%).
Best results are seen with Debian10, which defaults to mq-deadline scheduler. Then I/O wait becomes 0%. Not sure why cfq is having such issues with only this engine but something to consider when using on older linux distros i guess...