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From: Marc Rechté <marc4@rechte.fr>
To: pgsql-performance@lists.postgresql.org
Subject: NUMA settings
Date: Wed, 29 Apr 2020 08:54:08 +0200
Message-ID: <2d10f8ab-5fc6-a0a5-facf-68f35de95ea9@rechte.fr> (raw)

Hello,

I am trying to figure out the recommended settings for a PG dedicated 
machine regarding NUMA.

I assume that the shared buffers are using Huge Phages only. Please 
correct if I am wrong:

1) postgres is started with numactl --interleave=all, in order to spread 
memory pages evenly on nodes.
2) wm.swappiness is left to the default 60 value, because Huge Pages 
never swap, and we wish the idle backend to be swapped out if necessary.
3) vm.zone_reclaim_mode = 0. I am not sure it is the right choice.
4) kernel.numa_balancing = 1. Only if it is confirmed that it will not 
affect postgres, because started with the interleave policy.

Thanks

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