Re: shm

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Scott Ribe <scott_ribe(at)elevated-dev(dot)com>
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org>
Subject: Re: shm
Date: 2020-03-05 14:51:45
Message-ID: 1582.1583419905@sss.pgh.pa.us
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Scott Ribe <scott_ribe(at)elevated-dev(dot)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

In response to

  • shm at 2020-03-05 14:43:49 from Scott Ribe

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  • Re: shm at 2020-03-06 14:03:17 from Scott Ribe
  • Re: shm at 2020-03-06 14:06:50 from Scott Ribe

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