this post was submitted on 14 Aug 2023
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Lemmy Server Performance

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Lemmy Server Performance

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 backwards from PostgreSQL data to Rust code and TRIGGER FUNCTION logic, listed observations (bulletintree.com)
submitted 1 year ago by [email protected] to c/[email protected]
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  1. post primary key has gaps in it, the sequence is being used for transactions that are later canceled or some kind of orphan posts? This is observable from incoming federation posts from other instances.

  2. comment_aggregates has a unique id column from comment table id column. There is a one to one row relationship. Can the logic be reworked to eliminate the extra column and related INDEX overhead?

  3. Related to 2... Same issue probably exist in post_aggregates table and others that have one to one join relationships.

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