tfw your work requires you to read through @brendangregg's old blog postspic.twitter.com/8DX8yoffDY
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experimentally, I use lmbench's lat_mem_rd and bw_mem. Examples in https://github.com/brendangregg/Misc/blob/master/microbenchmarks/microbench_ubuntu.sh … .
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for observation, PMCs can fetch utilization of memory busses and interconnects, but outside of Intel vTune you'll need to roll your own tools. Likehttps://github.com/brendangregg/pmc-cloud-tools …
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Eg, we need a per-port tput tool like my old amd64htcpu http://www.brendangregg.com/blog/2013-05-27/the-greatest-tool-that-never-worked-har.html … , but for Linux & QPI. Please write one. :) You can add it to the pmc-cloud-tools repo. (I should have already, but haven't had many PMCs available on EC2 until recently)
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then there's the new Intel MBM in Linux, which I haven't used yet for the same reason (EC2 availability), but if you can do a blog post on it https://old.lwn.net/Articles/679691/ …
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could also enhance tiptop to have a column for each bus...https://github.com/FeCastle/tiptop
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thank you Brendan! :D
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