Good morning,
This is something that has caused problems as long as I have worked with Linux.
How do you accurately monitor virtual memory usage and alert before
applications start to suffer but in a meaningful way and without being wasteful.
# free -h
total used free shared buff/cache available
Mem: 62Gi 26Gi 1.1Gi 33Gi 35Gi 2.4Gi
Swap: 4.0Gi 3.9Gi 69Mi
(Output from free version 3.3.15)
In the above, I wouldn't just blindly go by "available" (our current monitor adds up
total virtual memory) but Red Hat "support" says that would be the most sensible number
to look at without a deep dive.
I'm surprised it is not something that appears to be looked at much. Almost all
places I have worked, they just have a paging space monitor and then freak out
when it goes above 20%. Not something I have ever been a fan of.
How do you do it? (If you do monitor memory).
Regards,
Henrik Morsing
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