In the Gaudi-framework, there exist several layers of print-statements. According to the level which is set (f. ex. in an options-file), any message with this level or higher will be printed.

• DEBUG (2)
• INFO (3)
• WARNING (4)
• ERROR (5)
• FATAL (6)

Additionally the following constants are definded:

• NIL (0)
• VERBOSE (1)
• ALWAYS (7)
• NUM_LEVELS (8)

In your C++-code, you can add these statements the following way, f.ex:

if ( msgLevel(MSG::WARNING) ) warning() << "Could not retrieve tracks. Skipping" << endmsg;

All the other messages are printed by replacing “warning” with the appropriate level.

In the options file, you can change the output level for a given class by setting:

myClass.OutputLevel = 4

for example for a tool:

Tuple.TupleToolEventInfo.OutputLevel = 4