Content-Type: multipart/mixed; boundary="------------0tp327Cexxl0Romf2kJ9kgck"
Message-ID: <3a27c830-b81f-4560-9774-a87d9b922fbd@tantorlabs.com>
Date: Tue, 14 Jan 2025 15:00:46 +0300
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: Sample rate added to pg_stat_statements
To: Alena Rybakina <a.rybakina@postgrespro.ru>,
 Sami Imseih <samimseih@gmail.com>
Cc: Alexander Korotkov <aekorotkov@gmail.com>,
 Michael Paquier <michael@paquier.xyz>,
 Greg Sabino Mullane <htamfids@gmail.com>,
 "Andrey M. Borodin" <x4mmm@yandex-team.ru>,
 pgsql-hackers <pgsql-hackers@postgresql.org>
References: <fe99e0ca-e564-480e-b865-5f0cee30bc60@tantorlabs.com>
 <c7ce658a-e0eb-4c5f-92a8-511314d89bbb@tantorlabs.com>
 <6707FCA9-FD1A-4609-A1A6-142456C14E0C@yandex-team.ru>
 <CAKAnmmLD8C-Y6CVF74Ccup8h9YpzBYzSvWWRG_Qf8+5YEMh4-g@mail.gmail.com>
 <Zz0MFPq1s4WFxxpL@paquier.xyz>
 <CAPpHfdsTKAQqC3A48-MGQhrhfEamXZPb64w=utk7thQcOMNr7Q@mail.gmail.com>
 <320a31e6-4c91-438b-ab17-8a1d72384727@tantorlabs.com>
 <f202ed0f-28c3-45aa-884c-db0a78322342@tantorlabs.com>
 <fb3df2e0-2cd4-49ea-bfda-148bc43d613d@tantorlabs.com>
 <52e5e3aa-066a-4daf-8d65-77c34a2f0d98@tantorlabs.com>
 <6482A576-4465-4E46-A42C-F1767E8DDE30@yandex-team.ru>
 <CAA5RZ0s=JH4owVr=Tfr4DYpFnBrYJjKoq2d7NqdkBQKY5whiRQ@mail.gmail.com>
 <20994d10-ab44-4c6b-91bc-c4675cd2e58e@tantorlabs.com>
 <9D8A5BC8-A3A5-4DA9-9382-F30D343247D1@yandex-team.ru>
 <CAA5RZ0sBsajHdE_HPoJ-C5rp8QmfArd6a6yJo6bDMVpyW25E+Q@mail.gmail.com>
 <6cf6270b-e8fa-4d99-b74a-17e781cdf309@tantorlabs.com>
 <b40b76c3-fc54-4f11-a50f-e63cd6434560@postgrespro.ru>
Content-Language: en-US
From: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
In-Reply-To: <b40b76c3-fc54-4f11-a50f-e63cd6434560@postgrespro.ru>
Archived-At: <https://www.postgresql.org/message-id/3a27c830-b81f-4560-9774-a87d9b922fbd%40tantorlabs.com>
Precedence: bulk

This is a multi-part message in MIME format.
--------------0tp327Cexxl0Romf2kJ9kgck
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On 09.01.2025 22:13, Alena Rybakina wrote:
> Hi! Thank you for the work with this subject.
>
> I looked at your patch and noticed that this part of the code is 
> repeated several times:
>
> if (nesting_level == 0)
>     {
>         if (!IsParallelWorker())
>             current_query_sampled = 
> pg_prng_double(&pg_global_prng_state) < pgss_sample_rate;
>         else
>             current_query_sampled = false;
>
>     }
>
> I think you should put this in a function like 
> update_current_query_sampled. I've attached a diff file with the changes.


There was redundant checking of nesting_level, so I removed one of them. 
The fixed version is included in patch v10.

Alena, Sami – I apologize for not including you in the previous email. 
If you're interested in this approach, I'm open to any suggestions.

[0]: 
https://www.postgresql.org/message-id/1b13d748-5e98-479c-9222-3253a734a038%40tantorlabs.com

--
Best regards,
Ilia Evdokimov,
Tantor Labs LLC.

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