Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise
От | Joshua D. Drake |
---|---|
Тема | Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise |
Дата | |
Msg-id | 67f31b47-9886-b59a-17b7-1cdbbe8975ac@commandprompt.com обсуждение исходный текст |
Ответ на | Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise (Tom Lane <tgl@sss.pgh.pa.us>) |
Ответы |
Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise
(Mark Kirkwood <mark.kirkwood@catalyst.net.nz>)
Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise (Sokolov Yura <y.sokolov@postgrespro.ru>) Re: [HACKERS] autovacuum can't keep up, bloat just continues to rise ("Joshua D. Drake" <jd@commandprompt.com>) |
Список | pgsql-hackers |
On 07/19/2017 07:57 PM, Tom Lane wrote: > Peter Geoghegan <pg@bowt.ie> writes: >> My argument for the importance of index bloat to the more general >> bloat problem is simple: any bloat that accumulates, that cannot be >> cleaned up, will probably accumulate until it impacts performance >> quite noticeably. > > But that just begs the question: *does* it accumulate indefinitely, or > does it eventually reach a more-or-less steady state? The traditional > wisdom about btrees, for instance, is that no matter how full you pack > them to start with, the steady state is going to involve something like > 1/3rd free space. You can call that bloat if you want, but it's not > likely that you'll be able to reduce the number significantly without > paying exorbitant costs. > > I'm not claiming that we don't have any problems, but I do think it's > important to draw a distinction between bloat and normal operating > overhead. Agreed but we aren't talking about 30% I don't think. Here is where I am at. It took until 30 minutes ago for the tests to finish: name | setting -------------------------------------+----------- autovacuum | on autovacuum_analyze_scale_factor | 0.1 autovacuum_analyze_threshold | 50 autovacuum_freeze_max_age | 200000000autovacuum_max_workers | 3 autovacuum_multixact_freeze_max_age | 400000000 autovacuum_naptime | 60 autovacuum_vacuum_cost_delay | 20 autovacuum_vacuum_cost_limit | -1 autovacuum_vacuum_scale_factor | 0.2 autovacuum_vacuum_threshold | 50 autovacuum_work_mem | -1log_autovacuum_min_duration | -1 Test 1: 55G /srv/main TPS: 955 Test 2: 112G /srv/main TPS: 531 (Not sure what happened here, long checkpoint?) Test 3: 109G /srv/main TPS: 868 Test 4: 143G TPS: 840 Test 5: 154G TPS: 722 I am running the query here: https://wiki.postgresql.org/wiki/Index_Maintenance#Summarize_keyspace_of_a_B-Tree_index And will post a followup. Once the query finishes I am going to launch the tests with autovacuum_vacuum_cost_limit of 5000. Is there anything else you folks would like me to change? JD -- Command Prompt, Inc. || http://the.postgres.company/ || @cmdpromptinc PostgreSQL Centered full stack support, consulting and development. Advocate: @amplifypostgres || Learn: https://pgconf.us ***** Unless otherwise stated, opinions are my own. *****
В списке pgsql-hackers по дате отправления:
Предыдущее
От: Craig RingerДата:
Сообщение: Re: [HACKERS] [PATCH] pageinspect function to decode infomasks
Следующее
От: Neha SharmaДата:
Сообщение: Re: [HACKERS] [TRAP: FailedAssertion] causing server to crash