First off, you have 24G of RAM available and PostgreSQL only seems to
have access to 400M of it. Bump shared_buffers up to 2 or 3 G at least,
and bump up work_mem to at least a few hundred meg, and
maintenance_work_mem up to at 1/2G or so.
All right. Here is what I did. I setup a new shmmax value this way:
sysctl kern.ipc.shmmax=8589934592
It is 8G. (By the way I also have kern.ipc.shm_use_phys: 1 ) Then I
have changed shared_mem to 1024MB in postgresql.conf.
Then I tried to start postgresql I got this message in the log:
Dec 9 17:53:59 shopzeus postgres[27247]: [1-4] The PostgreSQL
documentation contains more information about shared memory configuration.
Dec 9 17:55:52 shopzeus postgres[27328]: [1-1] FATAL: could not create
shared memory segment: Cannot allocate memory
Dec 9 17:55:52 shopzeus postgres[27328]: [1-2] DETAIL: Failed system
call was shmget(key=5432001, size=1105051648, 03600).
Dec 9 17:55:52 shopzeus postgres[27328]: [1-3] HINT: 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 1105051648 bytes), reduce PostgreSQL's shared_buffers
parameter (currently 131072) and/or its max_connections parameter
(currently 203).
Dec 9 17:55:52 shopzeus postgres[27328]: [1-4] The PostgreSQL
documentation contains more information about shared memory configuration.
I do not understand.
Doc says these:
"max_connections cost ~ 400 bytes of shared memory slot, plus lock space
(see max_locks_per_transaction)."
Even if I had max_connections = 5000, total shared memory required would
be way below shmmax=8G.
What am I missing here?
Thanks
Laszlo
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