De: "Ron" <[hidden email]> Para: "pgsql-general" <[hidden email]> Enviadas: Segunda-feira, 14 de setembro de 2020 13:10:23 Assunto: Re: Effective IO Concurrency
On 9/14/20 11:03 AM, Laurenz Albe wrote: > On Mon, 2020-09-14 at 10:39 -0300, [hidden email] wrote: >> In PostgreSQL 13, the way of using effective_io_concurrency has changed. Until v12, >> I used 200 for this value (using SSD drives). Using the new formula described in >> https://www.postgresql.org/docs/13/release-13.html gives me 1176. >> However, in the documentation https://www.postgresql.org/docs/13/runtime-config-resource.html#GUC-EFFECTIVE-IO-CONCURRENCY >> it says that the maximum value allowed is 1000. > Then use the value 1000...
I think he means that the formula should take that into account.
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For future reference, and maybe a updated documentation:
SELECT least(round(sum(OLD / n::float)),1000) FROM generate_series(1, OLD) s(n)
I don't know how to write patches, so maybe someone can do that.