Re: Spinlocks and semaphores in 9.2 and 9.3

From: Andres Freund <andres(at)anarazel(dot)de>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org, Robert Haas <robertmhaas(at)gmail(dot)com>
Subject: Re: Spinlocks and semaphores in 9.2 and 9.3
Date: 2016-04-18 15:27:07
Message-ID: 20160418152707.ojoeurr3bniyrnr2@alap3.anarazel.de
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On 2016-04-18 11:24:07 -0400, Tom Lane wrote:
> (The thing that gave me pause about this was noticing that I could not
> start two such postmasters concurrently on my RHEL6 box, without changing
> the default system limits on number of SysV semaphores.)

Hm, is that different before/after the patch? Because afaics at around
NBuffers = 1000, the number of semaphores should be lower after the
patch?

Andres

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