Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s0KRs-0037gl-D6 for pgsql-hackers@arkaria.postgresql.org; Fri, 26 Apr 2024 12:13:05 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1s0KRp-009uk1-68 for pgsql-hackers@arkaria.postgresql.org; Fri, 26 Apr 2024 12:13:02 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s0KRo-009ujt-Ed for pgsql-hackers@lists.postgresql.org; Fri, 26 Apr 2024 12:13:01 +0000 Received: from forward500b.mail.yandex.net ([2a02:6b8:c02:900:1:45:d181:d500]) by makus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s0KRf-0008Wr-Eb for pgsql-hackers@postgresql.org; Fri, 26 Apr 2024 12:12:59 +0000 Received: from mail-nwsmtp-smtp-production-main-23.myt.yp-c.yandex.net (mail-nwsmtp-smtp-production-main-23.myt.yp-c.yandex.net [IPv6:2a02:6b8:c12:4d9c:0:640:f3a0:0]) by forward500b.mail.yandex.net (Yandex) with ESMTPS id 7451E61031; Fri, 26 Apr 2024 15:12:46 +0300 (MSK) Received: by mail-nwsmtp-smtp-production-main-23.myt.yp-c.yandex.net (smtp/Yandex) with ESMTPSA id jCMto2DX0Gk0-5xFXGoEQ; Fri, 26 Apr 2024 15:12:45 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1714133565; bh=9+qZwUx3a7l342XrxMVMI+WvGmVICJLYk8kR261oH1c=; h=In-Reply-To:Cc:Date:References:To:Subject:Message-ID:From; b=vVQItFX5F+2UqyVM5rZxMUJ9htzqnerVRd8Ew/IT6PI/fnQ3UbUe1TL/rD7p+aXYO Dnqw574CxTy77eaVZNIPM5YL2nF7LDvJckqZGrwhPS0zrVBgWnNldp2ljEgMGDNZO2 xkuBaTTutl6hY0h/IszMv3XDXqZnHyo/vlr/QO78= Authentication-Results: mail-nwsmtp-smtp-production-main-23.myt.yp-c.yandex.net; dkim=pass header.i=@yandex.ru Content-Type: multipart/mixed; boundary="------------qx4BAFKDBKyGztiilqGofhJG" Message-ID: <12c98d7d-a153-496a-bc56-2b9f38f1433e@yandex.ru> Date: Fri, 26 Apr 2024 15:12:45 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Fix parallel vacuum buffer usage reporting To: Anthonin Bonnefoy Cc: Masahiko Sawada , PostgreSQL Hackers References: <611de844-d3f6-4395-9042-5c76203b7250@yandex.ru> Content-Language: en-US From: Alena Rybakina In-Reply-To: List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk This is a multi-part message in MIME format. --------------qx4BAFKDBKyGztiilqGofhJG Content-Type: multipart/alternative; boundary="------------avKHgM8fBVT3yuEfUmdTfEyM" --------------avKHgM8fBVT3yuEfUmdTfEyM Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi! > The same script was run, but using vacuum verbose analyze, and I > saw the difference again in the fifth step: > with your patch: buffer usage: 32312 hits, 607 misses, 1566 dirtied > master: buffer usage: 32346 hits, 573 misses, 1360 dirtied > > Isn't there a chance for the checkpointer to run during this time? > That could make the conditions between the two runs slightly different > and explain the change in buffer report. > > [0] > https://github.com/postgres/postgres/blob/8a1b31e6e59631807a08a4e9465134c343bbdf5e/src/backend/access/heap/vacuumlazy.c#L2826-L2831 > > Looking at the script, you won't trigger the problem. Thank you for the link I accounted it in my next experiments. I repeated the test without processing checkpoints with a single index, and the number of pages in the buffer used almost matched: master branch: buffer usage: 32315 hits, 606 misses, 4486 dirtied with applied patch v4 version: buffer usage: 32315 hits, 606 misses, 4489 dirtied I think you are right - the problem was interfering with the checkpoint process, by the way I checked the first version patch. To cut a long story short, everything is fine now with one index. Just in case, I'll explain: I considered this case because your patch could have impact influenced it too. On 25.04.2024 10:17, Anthonin Bonnefoy wrote: > > On Wed, Apr 24, 2024 at 4:01 PM Alena Rybakina > wrote: > > I tested the main postgres branch with and without your fix using > a script that was written by me. It consists of five scenarios and > I made a comparison in the logs between the original version of > the master branch and the master branch with your patch: > >  Hi! Thanks for the tests. > > I have attached a test file (vacuum_check_logs.sql) > > The reporting issue will only happen if there's a parallel index > vacuum and it will only happen if there's at least 2 indexes [0]. You > will need to create an additional index. Speaking of the problem, I added another index and repeated the test and found a significant difference: * I found it when I commited the transaction (3): master: 2964hits, 0misses, 0dirtied with applied patch v4 version: buffer usage: 33013hits, 0misses, 3dirtied * When I deleted all the data from the table and later started vacuum verbose again (4): master: buffer usage: 51486hits, 0misses, 0dirtied with applied patch v4 version:buffer usage: 77924hits, 0misses, 0dirtied * when I inserted 1 million data into the table and updated it (5): master:buffer usage: 27904hits, 5021misses, 1777dirtied with applied patch v4 version:buffer usage: 41051hits, 9973misses, 2564dirtied As I see, the number of pages is significantly more than it was in the master branch and ,frankly, I couldn't fully figure out if it was a mistake or not. I attached a test script (vacuum_checks_logs.sql) with two indexes and no checkpoints, I also attached log files: the first one (vacuum_test) is the result of testing on the master branch, the second file with your applied patch (vacuum_test_v4). -- Regards, Alena Rybakina Postgres Professional:http://www.postgrespro.com The Russian Postgres Company --------------avKHgM8fBVT3yuEfUmdTfEyM Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi!

The same script was run, but using vacuum verbose analyze, and I saw the difference again in the fifth step:
with your patch: buffer usage: 32312 hits, 607 misses, 1566 dirtied
master: buffer usage: 32346 hits, 573 misses, 1360 dirtied
Isn't there a chance for the checkpointer to run during this time? That could make the conditions between the two runs slightly different and explain the change in buffer report.

Thank you for the link I accounted it in my next experiments.

I repeated the test without processing checkpoints with a single index, and the number of pages in the buffer used almost matched:

master branch: buffer usage: 32315 hits, 606 misses, 4486 dirtied

with applied patch v4 version: buffer usage: 32315 hits, 606 misses, 4489 dirtied

I think you are right - the problem was interfering with the checkpoint process, by the way I checked the first version patch. To cut a long story short, everything is fine now with one index.

Just in case, I'll explain: I considered this case because your patch could have impact influenced it too.

On 25.04.2024 10:17, Anthonin Bonnefoy wrote:

On Wed, Apr 24, 2024 at 4:01 PM Alena Rybakina <lena.ribackina@yandex.ru> wrote:
I tested the main postgres branch with and without your fix using a script that was written by me. It consists of five scenarios and I made a comparison in the logs between the original version of the master branch and the master branch with your patch:
 Hi! Thanks for the tests.

I have attached a test file (vacuum_check_logs.sql)
The reporting issue will only happen if there's a parallel index vacuum and it will only happen if there's at least 2 indexes [0]. You will need to create an additional index.

Speaking of the problem, I added another index and repeated the test and found a significant difference:

  • I found it when I commited the transaction (3):

master: 2964 hits, 0 misses, 0 dirtied

with applied patch v4 version: buffer usage: 33013 hits, 0 misses, 3 dirtied

  • When I deleted all the data from the table and later started vacuum verbose again (4):

master: buffer usage: 51486 hits, 0 misses, 0 dirtied

with applied patch v4 version:buffer usage: 77924 hits, 0 misses, 0 dirtied

  • when I inserted 1 million data into the table and updated it (5):

master:buffer usage: 27904 hits, 5021 misses, 1777 dirtied

with applied patch v4 version:buffer usage: 41051 hits, 9973 misses, 2564 dirtied

As I see, the number of pages is significantly more than it was in the master branch and ,frankly, I couldn't fully figure out if it was a mistake or not.

I attached a test script (vacuum_checks_logs.sql) with two indexes and no checkpoints, I also attached log files: the first one (vacuum_test) is the result of testing on the master branch, the second file with your applied patch (vacuum_test_v4). 
-- 
Regards,
Alena Rybakina
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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