From: Justin Pryzby <pryzby@telsasoft.com>
To: Don Seiler <don@seiler.us>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: High kswapd
Date: Mon, 13 Apr 2020 09:58:52 -0500
Message-ID: <20200413145852.GT2228@telsasoft.com> (raw)
In-Reply-To: <CAHJZqBCEhjpq0URbbwAsOc08Q6d9kMy790f6EO+A18ANz4zbaQ@mail.gmail.com>
References: <CAHJZqBCWEk6-0NG9bQ8XWRaRz97ppPh=ZZZ89Ykvkn+EUHSNcg@mail.gmail.com>
<20200413144254.GS2228@telsasoft.com>
<CAHJZqBCEhjpq0URbbwAsOc08Q6d9kMy790f6EO+A18ANz4zbaQ@mail.gmail.com>
On Mon, Apr 13, 2020 at 09:46:22AM -0500, Don Seiler wrote:
> ==> /sys/kernel/mm/ksm/run <==
> 0
Was it off to begin with ?
If not, you can set it to "2" to "unshare" pages.
> ==> /sys/kernel/mm/transparent_hugepage/khugepaged/defrag <==
> 1
So I'd suggest trying with this disabled.
I don't know if I ever fully understood the problem, but it sounds like at
least in your case it's related to large shared_buffers, and hugepages, which
cannot be swapped out.
--
Justin
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To: pgsql-performance@postgresql.org
Cc: pryzby@telsasoft.com, don@seiler.us, pgsql-performance@lists.postgresql.org
Subject: Re: High kswapd
In-Reply-To: <20200413145852.GT2228@telsasoft.com>
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