Passenger: 100% CPU

Possible reasons:

1. Piped logging seems to have caused a problem that’s been fixed in version 4.0.6 of Passenger

2. If you need to debug Passenger problems, use this option:

PassengerDebugLogFile <path to log>

and this to specify the log level:

PassengerLogLevel <integer – see guide>

(in Apache syntax)


(in Nginx syntax)

Apache Guide:

Nginx Guide:

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