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Add inotify instance limit info to README #15795

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Nov 24, 2020
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Add inotify instance limit info to README #15795

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Added inotify instance limit info
SimonBrandner Nov 23, 2020
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Better wording
SimonBrandner Nov 23, 2020
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Cleanup
SimonBrandner Nov 23, 2020
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23 changes: 15 additions & 8 deletions README.md
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Expand Up @@ -275,22 +275,29 @@ modifying it. See the [configuration docs](docs/config.md) for details.
Open http://127.0.0.1:8080/ in your browser to see your newly built Element.

**Note**: The build script uses inotify by default on Linux to monitor directories
for changes. If the inotify watch limit is too low your build will silently fail.
To avoid this issue, we recommend a limit of at least 128M.
for changes. If the inotify limits are too low your build will fail silently or with
`Error: EMFILE: too many open files`. To avoid these issues, we recommend a watch limit
of at least `128M` and instance limit around `512`.

To set a new inotify watch limit, execute:
Linked issues are [#15750](https://github.com/vector-im/element-web/issues/15750) and
[#15774](https://github.com/vector-im/element-web/issues/15774).
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To set a new inotify watch and instance limit, execute:

```
$ sudo sysctl fs.inotify.max_user_watches=131072
$ sudo sysctl -p
sudo sysctl fs.inotify.max_user_watches=131072
sudo sysctl fs.inotify.max_user_instances=512
sudo sysctl -p
```

If you wish, you can make this new limit permanent, by executing:
If you wish, you can make the new limits permanent, by executing:

```
$ echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
$ sudo sysctl -p
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
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echo fs.inotify.max_user_instances=512 | sudo tee -a /etc/sysctl.conf
sudo sysctl -p
```

___

When you make changes to `matrix-react-sdk` or `matrix-js-sdk` they should be
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