From: Tom Lane <tgl@sss.pgh.pa.us>
To: Scott Ribe <scott_ribe@elevated-dev.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: shm
Date: Thu, 05 Mar 2020 09:51:45 -0500
Message-ID: <1582.1583419905@sss.pgh.pa.us> (raw)
In-Reply-To: <565DBAD4-E79D-4EE0-89C4-ABE33AD0C0A7@elevated-dev.com>
References: <565DBAD4-E79D-4EE0-89C4-ABE33AD0C0A7@elevated-dev.com>
Scott Ribe <scott_ribe@elevated-dev.com> writes:
> What is POSIX shared memory used for anymore?
We still allocate a small shm block as a means of counting live backends
(since the SysV spec includes an "nattch" count but mmap'd segments do
not provide that info). Should only be ~50 bytes though.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, scott_ribe@elevated-dev.com
Subject: Re: shm
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