My instances observe and report the amount of time spent in methods. Observing a method implies observing all messages it sends.

Q: How do you interpret MessageTally>>tallySends
A: The methods #tallySends and #spyOn: measure two very different quantities, but broken down in the same who-called-who format. #spyOn: is approximate, but more indicative of real time spent, whereas #tallySends is exact and a precise record of how many times each method got executed.

	comparing
	< = > hash isPrimitives sonsOver: species

	initialize-release
	close spyEvery:on: spyEvery:onProcess:forMilliseconds:

	printing
	fullPrintOn:tallyExact:orThreshold: leavesPrintOn:tallyExact:orThreshold: printOn: printOn:total:totalTime:tallyExact: printSenderCountsOn: treePrintOn:tabs:thisTab:total:totalTime:tallyExact:orThreshold:

	private
	class:method: copyWithTally: method primitives:

	reporting
	report: report:cutoff: reportGCStatsOn: tally time

	tallying
	bumpBy: tally:by: tallyPath:by:

	collecting leaves	top
	bump:
	bump:fromSender: Add this hitCount to the total, and include a reference to the sender responsible for the increment
	into:fromSender:
	leavesInto:fromSender:

	comparing	top
	< Refer to the comment in Magnitude|<.
	= Compare the receiver with the argument and answer with true if the receiver is equal to the argument. Otherwise answer false.
	> Refer to the comment in Magnitude|>.
	hash Hash is reimplemented because = is implemented.
	isPrimitives Detect pseudo node used to carry tally of local hits
	sonsOver:
	species Answer the preferred class for reconstructing the receiver. For example, collections create new collections whenever enumeration messages such as collect: or select: are invoked. The new kind of collection is determined by the species of the original collection. Species and class are not always the same. For example, the species of Interval is Array.

	initialize-release	top
	close
	spyEvery:on: Create a spy and spy on the given block at the specified rate.
	spyEvery:onProcess:forMilliseconds: Create a spy and spy on the given process at the specified rate.

	printing	top
	fullPrintOn:tallyExact:orThreshold:
	leavesPrintOn:tallyExact:orThreshold:
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.
	printOn:total:totalTime:tallyExact:
	printSenderCountsOn:
	treePrintOn:tabs:thisTab:total:totalTime:tallyExact:orThreshold:

	private	top
	class:method:
	copyWithTally:
	method
	primitives:

	reporting	top
	report: Print a report, with cutoff percentage of each element of the tree (leaves, roots, tree)=2, on the stream, strm.
	report:cutoff:
	reportGCStatsOn:
	tally Answer the receiver's number of tally.
	time Answer the receiver's run time.

	tallying	top
	bumpBy:
	tally:by: Explicitly tally the specified context and its stack.
	tallyPath:by:

	spying	top
	spyOn: MessageTally spyOn: [100 timesRepeat: [3.14159 printString]]
	spyOn:toFileNamed: Spy on the evaluation of aBlock. Write the data collected on a file named fileName.
	spyOnProcess:forMilliseconds: | p | p _ [100000 timesRepeat: [3.14159 printString]] fork. (Delay forMilliseconds: 100) wait. MessageTally spyOnProcess: p forMilliseconds: 1000
	spyOnProcess:forMilliseconds:toFileNamed: Spy on the evaluation of aProcess. Write the data collected on a file named fileName. Will overwrite fileName
	tallySends: MessageTally tallySends: [3.14159 printString]
	tallySendsTo:inBlock:showTree: MessageTally tallySends: [3.14159 printString]
	time: