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

On Tue, Jul 18, 2017 at 1:01 PM, Claudio Freire <klaussfreire@gmail.com> wrote:
> 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

I realize you have zone_reclaim_mode set to 0. Still, the symptoms are
eerily similar.