On 5/21/25 23:38, Ben Scott wrote:
What I’ve noticed is that at startup I’m using about 33K pages as the VSZ (per
top on x86_64 hardware).
VSZ (virtual size) just counts the number of virtual memory pages associated
with the process in some way. That includes RAM, but also memory mapped files,
devices, sparse pages that will never be backed by anything, etc. You need to
look at RSS (resident size) to monitor actual RAM usage.
The results of "rdnc stats" and/or the "statistics-channels" will provide
BIND-specific statistics. The former can be run without preparation; the latter is a bit
friendlier but needs a config change.
https://kb.isc.org/docs/monitoring-recommendations-for-bind-9
https://kb.isc.org/docs/aa-00769
https://kb.isc.org/docs/aa-01123
Specifically for suspected memory usage issues see also
https://gitlab.isc.org/isc-projects/bind9/-/wikis/BIND-9-Memory-Explained
--
Petr Špaček
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