Too many open files

Radzen Studio Angular
1

Hello,
just installed Radzen latest version (2.10.14) under Ubuntu 18.10.

I create a new project and I get:
Error: EMFILE: too many open files, watch '/home/mgiammarco/Documenti/provaRadzen/meta'
at FSWatcher.start (fs.js:1421:26)
at Object.fs.watch (fs.js:1458:11)
...

Can you help me?
Thanks,
Mario

2

How many files do you have in the /home/mgiammarco/Documenti/provaRadzen/meta directory? There is a chance other applications have opened files too. You can increase that number by running ulimit -n 4096

3

In the meta directory I have only files created by Radzen. I moved the application folder in a directory not backupped by synology software (which keeps file notifications) just to be sure. I also gave ulimit command.
After many open files exceptions the application starts, I can work, but when I run it I get:

dotnet:
Unhandled Exception:
dotnet: System.IO.IOException: The configured user limit (128) on the number of inotify instances has been reached.
at System.IO.FileSystemWatcher.StartRaisingEvents()
at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.TryEnableFileSystemWatcher()
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.CreateFileChangeToken(String filter)
at Microsoft.Extensions.Primitives.ChangeToken.OnChange(Func`1 changeTokenProducer, Action changeTokenConsumer)
at Microsoft.Extensions.Configuration.FileConfigurationProvider..ctor(FileConfigurationSource source)
at Microsoft.Extensions.Configuration.Json.JsonConfigurationSource.Build(IConfigurationBuilder builder)

Looking in internet it seems a not related error but I am not sure.
It seems strange that only radzen has these problems. I have android studio and eclipse opened without errors.

4

The last exception seems to be a quirk of .NET Core. You will have to globally increase the number of open files.

Android Studio and Eclipse don't use .NET Core so you won't see that exception there.

5

Ok problem solved. It seems that in modern distro you obtain results only if you put limits in /etc/systemd/user.conf and system.conf and reboot.

6

To avoid dotnet error these are the commands:
echo 999999 | sudo tee -a /proc/sys/fs/inotify/max_user_watches
echo 999999 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
echo 999999 | sudo tee -a /proc/sys/fs/inotify/max_user_instances