Totalview® User Guide : PART I Introduction to Debugging with TotalView : Chapter 1 About TotalView : Data Display and Visualization : Data Display : Setting Watchpoints
Setting Watchpoints
The watchpoint — another type of action point — is yet another way to look at data. A TotalView watchpoint can stop execution when a variable’s data changes, no matter the cause. That is, you could change data from within 30 different statements, triggering the watchpoint to stop execution after each of these 30 statements make a change. Or, if data is being overwritten, you could set a watchpoint at that location in memory and then wait until TotalView stops execution because of an overwrite.
If you associate an expression with a watchpoint (by selecting the Conditional button in the Watchpoint Properties dialog box to enter an expression), TotalView evaluates the expression after the watchpoint triggers.
 
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About watchpoints in general
The Tools > Create Watchpoint command
Tools > Create Watchpoint in the in-product Help