Re: BUG #13971: SysV shm is used regardless of config

On Thu, Feb 18, 2016 at 4:43 AM, <tarkhil(at)over(dot)ru> wrote:
> The following bug has been logged on the website:
>
> Bug reference: 13971
> Logged by: Alex Povolotsky
> Email address: tarkhil(at)over(dot)ru
> PostgreSQL version: 9.4.6
> Operating system: FreeBSD 10.2
> Description:
>
> regardless of dynamic_shared_memory_type, postgres upon start still calls
> shmget.

That setting controls what kind of memory is used by custom dynamic
Background Worker Processes. It is not the only shared memory used by
PostgreSQL--in fact most people don't use that kind at all because
most people don't use custom dynamic background worker processes.

> In FreeBSD's jail, with disabled sysvipc, it yields error in
> src/backend/port/pg_shmem.c

You can't do that. sysvipc is not optional.

Cheers,

Jeff