> That did it! Bumping kern.ipc.shmall to 65536 got me back up and running
> with enough shared_memory to get my jobs done.
Having not so long ago been caught by this myself, I think the
relationship between shmmax and shmall is worth clarifying:
$ sysctl -d kern.ipc.shmall
kern.ipc.shmall: Maximum number of pages available for shared memory
$ sysctl -d kern.ipc.shmmax
kern.ipc.shmmax: Maximum shared memory segment size
So to run 1 Postgres installation with 128Mb of shared memory:
kern.ipc.shmall=32768
kern.ipc.shmmax=134217728
However suppose you want to run 2 Postgres installations, each using
128Mb of shared memory:
kern.ipc.shmall=65536
kern.ipc.shmmax=134217728
i.e. maximum system wide shared memory is 65536*4096 = 256Mb, but the
maximum size any single segment can be is 128Mb.
Thank you. I wasn't aware that one could alter sysctl's. I might dive
into that, makes kernel-maintenance a tiny bit easier.
regards
Claus
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