Lemmy Server Performance

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lemmy_server uses the Diesel ORM that automatically generates SQL statements. There are serious performance problems in June and July 2023 preventing Lemmy from scaling. Topics include caching, PostgreSQL extensions for troubleshooting, Client/Server Code/SQL Data/server operator apps/sever operator API (performance and storage monitoring), etc.

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Lemmy Server Performance, PostgreSQL log_min_duration_statement - can big servers share logs? value 2500ms targeting "slow queries" (lemmy.ml)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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This is the first post or comment in Lemmy history to say log_min_duration_statement ... ;)

It is possible to instruct PostgreSQL to log any query that takes over a certain amount of time, 2.5 seconds what I think would be a useful starting point. Minimizing the amount of logging activity to only those causing the most serious issues.

"Possibly the most generally useful log setting for troubleshooting performance, especially on a production server. Records only long-running queries for analysis; since these are often your "problem" queries, these are the most useful ones to know about. Used for pg_fouine." - https://postgresqlco.nf/doc/en/param/log_min_duration_statement/

I think it would really help if we could get lemmy.world or some other big site to turn on this logging and share it so we can try to better reproduce the performance overloads on development/testing systems. Thank you.

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[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

@[email protected]

Although with current sync problems, you may not get this mention: https://lemmy.world/c/[email protected]?dataType=Post&page=1&sort=New