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Add some advice about making Synapse faster

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Also removes some duplicate table of contents entries in maintenance-synapse.md
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Aaron Raimist 2021-04-02 19:10:53 -05:00
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@ -6,13 +6,11 @@ Table of contents:
- [Purging old data with the Purge History API](#purging-old-data-with-the-purge-history-api), for when you wish to delete in-use (but old) data from the Synapse database
- [Synapse maintenance](#synapse-maintenance)
- [Purging old data with the Purge History API](#purging-old-data-with-the-purge-history-api)
- [Compressing state with rust-synapse-compress-state](#compressing-state-with-rust-synapse-compress-state)
- [Browse and manipulate the database](#browse-and-manipulate-the-database)
- [Browse and manipulate the database](#browse-and-manipulate-the-database), for when you really need to take matters into your own hands
- [Make Synapse faster](#make-synapse-faster)
## Purging old data with the Purge History API
@ -73,3 +71,11 @@ docker run --rm --publish 1799:8080 --link matrix-postgres --net matrix adminer
You should then be able to browse the adminer database administration GUI at http://localhost:1799/ after entering your DB credentials (found in the `host_vars` or on the server in `{{matrix_synapse_config_dir_path}}/homeserver.yaml` under `database.args`)
⚠️ Be **very careful** with this, there is **no undo** for impromptu DB operations.
## Make Synapse faster
Synapse's presence feature which tracks which users are online and which are offline can use a lot of processing power. You can disable presence by adding `matrix_synapse_use_presence: false` to your `vars.yml` file.
Tuning Synapse's cache factor can help reduce RAM usage. See the upstream documentation for more information on what value to set this to https://github.com/matrix-org/synapse#help-synapse-is-slow-and-eats-all-my-ram-cpu. Use the variable `matrix_synapse_caches_global_factor` to set the cache factor.
See also [How do I optimize this setup for a low-power server?](faq.md#how-do-i-optimize-this-setup-for-a-low-power-server).