Re: [PERFORM] Very poor read performance, query independent

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От Claudio Freire
Тема Re: [PERFORM] Very poor read performance, query independent
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Msg-id CAGTBQpYUAKhrKYiTm3LNVAwV0trk9RCxZT-CDzUZsUFnME0emg@mail.gmail.com
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Ответ на Re: [PERFORM] Very poor read performance, query independent  (Charles Nadeau <charles.nadeau@gmail.com>)
Ответы Re: [PERFORM] Very poor read performance, query independent  (Claudio Freire <klaussfreire@gmail.com>)
Список pgsql-performance
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On Tue, Jul 18, 2017 at 6:20 AM, Charles Nadeau
<charles.nadeau@gmail.com> wrote:
> Claudio,
>
> At one moment
> during the query, there is a write storm to the swap drive (a bit like this
> case:
> https://www.postgresql.org/message-id/AANLkTi%3Diw4fC2RgTxhw0aGpyXANhOT%3DXBnjLU1_v6PdA%40mail.gmail.com).
> I can hardly explain it as there is plenty of memory on this server.

That sounds a lot like NUMA zone_reclaim issues:

https://www.postgresql.org/message-id/500616CB.3070408@2ndQuadrant.com

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