mirror of
https://github.com/1f349/dendrite.git
synced 2024-11-10 06:53:00 +00:00
72 lines
2.2 KiB
Markdown
72 lines
2.2 KiB
Markdown
---
|
|
title: Optimise your installation
|
|
parent: Installation
|
|
has_toc: true
|
|
nav_order: 10
|
|
permalink: /installation/start/optimisation
|
|
---
|
|
|
|
# Optimise your installation
|
|
|
|
Now that you have Dendrite running, the following tweaks will improve the reliability
|
|
and performance of your installation.
|
|
|
|
## File descriptor limit
|
|
|
|
Most platforms have a limit on how many file descriptors a single process can open. All
|
|
connections made by Dendrite consume file descriptors — this includes database connections
|
|
and network requests to remote homeservers. When participating in large federated rooms
|
|
where Dendrite must talk to many remote servers, it is often very easy to exhaust default
|
|
limits which are quite low.
|
|
|
|
We currently recommend setting the file descriptor limit to 65535 to avoid such
|
|
issues. Dendrite will log immediately after startup if the file descriptor limit is too low:
|
|
|
|
```
|
|
level=warning msg="IMPORTANT: Process file descriptor limit is currently 1024, it is recommended to raise the limit for Dendrite to at least 65535 to avoid issues"
|
|
```
|
|
|
|
UNIX systems have two limits: a hard limit and a soft limit. You can view the soft limit
|
|
by running `ulimit -Sn` and the hard limit with `ulimit -Hn`:
|
|
|
|
```bash
|
|
$ ulimit -Hn
|
|
1048576
|
|
|
|
$ ulimit -Sn
|
|
1024
|
|
```
|
|
|
|
Increase the soft limit before starting Dendrite:
|
|
|
|
```bash
|
|
ulimit -Sn 65535
|
|
```
|
|
|
|
The log line at startup should no longer appear if the limit is sufficient.
|
|
|
|
If you are running under a systemd service, you can instead add `LimitNOFILE=65535` option
|
|
to the `[Service]` section of your service unit file.
|
|
|
|
## DNS caching
|
|
|
|
Dendrite has a built-in DNS cache which significantly reduces the load that Dendrite will
|
|
place on your DNS resolver. This may also speed up outbound federation.
|
|
|
|
Consider enabling the DNS cache by modifying the `global` section of your configuration file:
|
|
|
|
```yaml
|
|
dns_cache:
|
|
enabled: true
|
|
cache_size: 4096
|
|
cache_lifetime: 600s
|
|
```
|
|
|
|
## Time synchronisation
|
|
|
|
Matrix relies heavily on TLS which requires the system time to be correct. If the clock
|
|
drifts then you may find that federation no works reliably (or at all) and clients may
|
|
struggle to connect to your Dendrite server.
|
|
|
|
Ensure that the time is synchronised on your system by enabling NTP sync.
|