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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How lemmy.ca took on finding why PostgreSQL was at 100% CPU and crashing the Lemmy website this past weekend. PostgreSQL auto_explain (lemmy.ml)

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

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IIRC, it was lemmy.ca full copy of live data that was used (copy made on development system, not live server - if I'm following). Shared Saturday July 22 on GitHub was this procedure:

...

Notable is the AUTO_EXPLAIN SQL activation statements:

LOAD 'auto_explain';
SET auto_explain.log_min_duration = 0;
SET auto_explain.log_analyze = true;
SET auto_explain.log_nested_statements = true;

This technique would be of great use for developers doing changes and study of PostgreSQL activity. Thank you!

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[–] [email protected] 3 points 1 year ago (1 children)

We don't get any crashes on ca since I disabled account deletion. Things are stable.

[–] [email protected] 2 points 1 year ago

ok. back to the drawing board.