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IBM System Blue Gene Solution: Blue Gene/Q System Administration by Brant Knudson, Gary Lakner

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Logging
Control System logs diagnose software, hardware, and configuration problems. This chapter provides information about Apache log4j and log4cxx, log file format, log merge utility, log configuration, and log rotation.
20.1 Apache log4j and log4cxx
The Blue Gene/Q Control System programs use an open source library based on Apache log4j for logging.The Apache log4j design provides a large number of features and offers a great deal of customizability. The library can be configured dynamically and includes a facility for initializing the library ...

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