> PG Doc comments form <noreply@postgresql.org> writes: > > On https://www.postgresql.org/docs/12/kernel-resources.html, the command to > > calculate memory allocated to postgres is not correct. Following is the > > command as shown in 18.4.5. Linux Huge Pages. > > pmap 4170 | awk '/rw-s/ && /zero/ {print $2}', this command does not return > > any results with correct pid. Probably /zero/ needs to be updated with > > /anon_hugepage/ > > The example seems to work as-given for me (testing on a RHEL8 system). > It's of course not guaranteed to work on every flavor of Linux.
I think the pattern as given will show you the size if you are not already using huge pages. For example, this line matches on my system when I have /proc/sys/vm/nr_hugepages == 0:
00007f2932eb6000 145360K rw-s- zero (deleted)
If you are already using huge pages, it doesn't match anything, because the relevant line looks like:
