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> The default to-date has been 64. The reason you don't see much
> trouble with it is twofold, 1) Linux has a huge default for
> semaphores and shared memory, 2) The old memory model allocated
> semaphores in blocks of 16 up to MaxBackedId (which was hard coded
> to 64). I did not run into trouble on untuned Solaris until
> postmaster tried to start the 49th backend (semaphores 49-64 when my
> kernel defaulted to 60).
>
> The new model allocates semaphores and shared memory at startup,
> assuring you won't experience midstream troubles like I did. It
> does, however allocate to the max or -N setting, which most users
> will probably never reach.
>
> I'd vote for 32 as the default.
I understand now. The stuff is preallocated.
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