Hi,
for 15 years pgfincore has been sitting quietly and being used in large
setups to help in HA and resources management.
It can perfectly stay as is, to be honest I was expecting to one day
include a windows support and propose that to PostgreSQL, it appears
getting support on linux and BSD is more than enough today.
So I wonder if there are interest for having virtual memory snapshot and
restore operations with, for example, pg_prewarm/autowarm ?
Some usecases covered: snapshot/restore cache around cronjobs, around
dumps, switchover, failover, on stop/start of postgres (think kernel
upgrade with a cold restart), ...
pgfincore also provides some nice information with mincore (on FreeBSD
mincore is more interesting) or cachestat, again it can remain as an out
of tree extension but I will be happy to add to commitfest if there are
interest from the community.
An example of cachestat output:
postgres=# select *from vm_relation_cachestat('foo',range:=1024*32);
block_start | block_count | nr_pages | nr_cache | nr_dirty |
nr_writeback | nr_evicted | nr_recently_evicted
-------------+-------------+----------+----------+----------+--------------+------------+---------------------
0 | 32768 | 65536 | 62294 | 0 |
0 | 3242 | 3242
32768 | 32768 | 65536 | 39279 | 0 |
0 | 26257 | 26257
65536 | 32768 | 65536 | 22516 | 0 |
0 | 43020 | 43020
98304 | 32768 | 65536 | 24944 | 0 |
0 | 40592 | 40592
131072 | 1672 | 3344 | 487 | 0 |
0 | 2857 | 2857
Comments?
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Cédric Villemain +33 (0)6 20 30 22 52
https://Data-Bene.io
PostgreSQL Expertise, Support, Training, R&D
