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Note: I know about the commands like top but I am interested in knowing the number of bytes written to memory and also rewrites (number of times storing to the memory happened)

Greg Askew
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NUPUR AGRAWAL
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  • Take a look at vmstat command and also at the ps command which has parameters about process memory usage. – Ptit Xav Mar 05 '23 at 12:01
  • I don't think such statistics are available as they would have a big effect on performance. – Tero Kilkanen Mar 05 '23 at 14:00
  • Here's an older question that looks relevant: https://stackoverflow.com/questions/19457342/trying-to-trap-all-memory-reads-writes-on-a-linux-machine – Juraj Martinka Mar 05 '23 at 16:59
  • What problem are you solving? Which tool to use depends on if you are a developer who can tolerate massive overhead to prove memory use correctness (Valgrind) or a production system that needs to run at a usable speed while sampling (Linux perf_events) – John Mahowald Mar 06 '23 at 06:07
  • I tried using perf mem but it doesn't reflect anything in terms of bytes (memory). – NUPUR AGRAWAL Mar 07 '23 at 04:04

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There are some per-CPU/per-socket counters which can be useful, e.g. this set of notes among other things points to https://github.com/intel/pcm. It has a tool to measure per-socket memory bandwidth on Intel processors.

If you are investigating some specific application you may pin it to a specific core, make sure nothing else runs on it and use per-socket stats provided by Intel's tool.

rvs
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