Re: Estimating HugePages Requirements?

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: "Bossart, Nathan" <bossartn(at)amazon(dot)com>
Cc: Justin Pryzby <pryzby(at)telsasoft(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, "tgl(at)sss(dot)pgh(dot)pa(dot)us" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "robertmhaas(at)gmail(dot)com" <robertmhaas(at)gmail(dot)com>, "masao(dot)fujii(at)oss(dot)nttdata(dot)com" <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, "andres(at)anarazel(dot)de" <andres(at)anarazel(dot)de>, "magnus(at)hagander(dot)net" <magnus(at)hagander(dot)net>, "mark(dot)dilger(at)enterprisedb(dot)com" <mark(dot)dilger(at)enterprisedb(dot)com>, "don(at)seiler(dot)us" <don(at)seiler(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Estimating HugePages Requirements?
Date: 2021-09-21 02:29:07
Message-ID: YUlDc/54/
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On Tue, Sep 21, 2021 at 12:08:22AM +0000, Bossart, Nathan wrote:
> Should we also initialize the shared memory GUCs in bootstrap and
> single-user mode? I think I missed this in bd17880.

Why would we need that for the bootstrap mode?

While looking at the patch for shared_memory_size, I have looked at
those code paths to note that some of the runtime GUCs would be set
thanks to the load of the control file, but supporting this case
sounded rather limited to me for --single when it came to shared
memory and huge page estimation and we don't load
shared_preload_libraries in this context either, which could lead to
wrong estimations. Anyway, I am not going to fight hard if people
would like that for the --single mode, even if it may lead to an
underestimation of the shmem allocated.

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