From: dangal <danielito.gallo@gmail.com>
To: pgsql-performance@postgresql.org
Subject: pg_stat_bgwriter
Date: Sun, 13 Oct 2019 18:27:35 -0700 (MST)
Message-ID: <1571016455698-0.post@n3.nabble.com> (raw)
Dear I would like to share with you to see what you think about the
statistics of pg_stat_bgwriter
postgres = # select * from pg_stat_bgwriter;
checkpoints_timed | checkpoints_req | checkpoint_write_time |
checkpoint_sync_time | buffers_checkpoint | buffers_clean | maxwritten_clean
| buffers_backend | buffers_
backend_fsync | buffers_alloc | stats_reset
------------------- + ----------------- + ------------ ----------- +
---------------------- + --------------- ----- + --------------- +
------------------ + --------- -------- + ---------
-------------- + --------------- + ------------------- ------------
338 | 6 | 247061792 | 89418 | 2939561 | 19872289 | 54876 |
6015787 |
0 | 710682240 | 2019-10-06 19: 25: 30.688186-03
(1 row)
postgres = # show bgwriter_delay;
bgwriter_delay
----------------
200ms
(1 row)
postgres = # show bgwriter_lru_maxpages;
bgwriter_lru_maxpages
-----------------------
100
(1 row)
postgres = # show bgwriter_lru_multiplier;
bgwriter_lru_multiplier
-------------------------
2
(1 row)
Do you think it should increase bgwriter_lru_maxpages due to the value of
maxwritten_clean?
Do you think it should increase bgwriter_lru_maxpages,
bgwriter_lru_multiplier, and decrease bgwriter_delay due to the value of
buffers_backend compared to buffers_alloc?
Do you think a modification is necessary?
What values would you recommend?
thank you
--
Sent from: https://www.postgresql-archive.org/PostgreSQL-performance-f2050081.html
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To: pgsql-performance@postgresql.org
Cc: danielito.gallo@gmail.com
Subject: Re: pg_stat_bgwriter
In-Reply-To: <1571016455698-0.post@n3.nabble.com>
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