On Thu, 6 Feb 2025 at 20:50, Ron / BCLUG via talk <talk@gtalug.org> wrote:
Alvin Starr via talk wrote on 2025-02-03 12:22:
https://www.kernel.org/doc/gorman/html/understand/understand007.html looks to describe the overall memory management of Linux.
I couldn't make heads nor tails of that, it's over my head.
A way to check this would be to load a single python interpreter and look at the memory used. Then load multiple copies of the same program and see if the memory usage is N*mem_used and not something less than N*mem_used.
I don't have anywhere to test that which won't have too many confounding variables.
I'll still try it if I get a chance.
But I did have a thought -- if MM3 is doing basically the same tasks as MM2 but taking up so much more memory, I kinda wonder if the extra Python3 instances with their separate PIDs makes more sense than workload / data, considering "same basic functionality".
In other news, I did hear back from the MM3 author (Mark Sapiro) on how to disable NNTP on MM2, so I've added that to GTALUG's config (but have *not* restarted it).
All of my previous experience managing servers has taught me to never do this: if you make a change, restart and test immediately. Or don't make the change - write yourself a note to try it later. The server is running now: no matter how trivial the change, you run a risk of this causing problems on restart or reboot. And if the restart isn't for months and/or is done by someone else, they will be confounded as to why a normal restart has left them with a broken server. I managed to do this to myself several times - and once or twice to other people. I stopped making untested changes to server configs, and I'm hoping you can benefit from the lesson(s) I learned.
It did remove one Python from my MM2 server:
Freshly restarted MM2 without NNTP:
Tasks: 8 (limit: 2256) Memory: 83.7M
With NNTP:
Tasks: 9 (limit: 2256) Memory: 93.9M
Hmmm - a 10MB difference for one process - NNTP gateway.
That cannot just be the Python script, it's gotta include 3.5MB Python2.7 (IMHO).
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