Hiya. I've installed Postgres 7.2 on a dedicated FreeBSD system with 384 MB RAM. Because the system will be doing nothing except PG, I'd like to dump as much memory as possible into PG's shared memory.
I rebuilt the kernel with very large limits: 330 MB on the MAXDSIZ and DFLDSIZ, and 330 MB for SHMMAXPAGES. This gives me: # sysctl kern.ipc.shmall kern.ipc.shmall: 42240 # sysctl kern.ipc.shmmax kern.ipc.shmmax: 346030080 I still cannot set PG's shared_buffers higher than 20000 (160 MB): IpcMemoryCreate: shmget(key=8971001, size=183017472, 03600) failed: Cannot allocate memory This error usually means that PostgreSQL's request for a shared memory segment exceeded available memory or swap space. To reduce the request size (currently 183017472 bytes), reduce PostgreSQL's shared_buffers parameter (currently 22000) and/or its max_connections parameter (currently 5). That I'm out of RAM seems fishy, though, since there's very little running and vmstat reports plenty of free RAM: procs memory page disks faults cpu r b w avm fre flt re pi po fr sr ad0 ad3 in sy cs us sy id 0 0 0 8484 353908 1 0 0 0 2 0 2 0 231 5 5 0 0 100 Any ideas as to what I missed? ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
