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Comment by makmanalp | Hacker News Reader

Wait this is really cool!! Reminds me of a thing I did a few years ago that I never completed (sigh) which was about visualizing access patterns in database storage engines.

Here's the report with pics and videos if that sounds interesting!

http://akmanalp.com/static/memory_trace.pdf

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This is awesome. I'm actually working on a project at the moment that uses DynamoRio to capture write instructions. Would be super interesting to use your tool to visualise the access patterns. Is your code available somewhere?

Gah, it's probably in some old laptop somewhere and I can see if I can dig it up this weekend. What does your project do?

We are looking at how you can take an existing in-memory datastore (e.g. Redis) and migrate it to use non-volatile memory (NVM) such as Intel Optane NVDIMMs for fast persistence. Similar pitch to this paper: https://www.usenix.org/conference/osdi20/presentation/zhang-... But better obviously :)

That sounds awesome! I can't seem to find it right now but I'm pretty sure I started out with one of the samples, I think memtrace_x86.c and that required only minimal modification to get it to do most of what I needed, minus eliminating addresses I don't care about, plotting and stuff which is not extra hard.

If you get stuck and / or end up doing something cool, shoot me an email at hn at my website on my profile!

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