```ruby
# config/puma.rb

threads 2,8
```

Add stdout/stderr redirection of puma in log/puma.out and log/puma.err
user
```ruby
# config/puma/development.rb

# Number of threads to start (min / max)
threads 2,8

# Log files
stdout_redirect 'log/puma.out', 'log/puma.err', true
```
assistant