elk-util-parent/elk-util-logging/src/main/java/org/semanticweb/elk/util/logging/Statistics.java
public static void logOperationStart(String operationName, Logger logger) {
		logOperationStart(operationName, logger, LogLevel.INFO);
	}
public static void logOperationStart(String operationName, Logger logger) {
		logOperationStart(operationName, logger, LogLevel.INFO);
	}
Log the start of a particular operation with INFO priority. This method
should be used for long-running tasks and is mainly intended. Multiple
threads can independently log operations of the same name, but
(obviously) no single thread should use the same operation name to record
the start and end of overlapping code.

@param operationName
@param logger