[GENERAL] Setting max_fsm_pages

[Carlos Oliva]

Should I set the max_fsm_pages to the value reported (vacuum verbose) as pages stored or the value reported as total pages needed?  I ran full + analyze vacuums in my database (vacuumdb –f –z –v <database name>) a couple of times and I got the following reports: INFO:  free space map: 454 relations, 22274 pages stored; 147328 total pages needed DETAIL:  Allocated FSM size: 1000 relations + 20000 pages = 178 kB shared memory   And   INFO:  free space map: 454 relations, 22242 pages stored; 147328 total pages needed DETAIL:  Allocated FSM size: 1000 relations + 20000 pages = 178 kB shared memory   I am not sure if I need to raise the max_fsm_pages to something larger than 22242 (e.g. 40000) or larger than 147,328.