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Using Watchpoints Figure 237: Tools > Watchpoint Dialog Boxes After you select a Create Watchpoint command, TotalView displays its Watchpoint Properties dialog box. See Figure 237. Controls in this dialog box let you create unconditional and conditional watchpoints. When you set a watchpoint, you are setting it on the complete contents of the information being displayed in the Variable Window. For example, if the Variable Window displays an array, you can only set a watchpoint on the entire array (or as many bytes as TotalView can watch.) If you only want to watch one array element, dive on the element and then set the watchpoint. Similarly, if the Variable Window displays a structure and you only want to watch one element, dive on the element before you set the watchpoint. See the online Help for information on the fields in this dialog box. Displaying Watchpoints The watchpoint entry, indicated by UDWP (Unconditional Data Watchpoint) and CDWP (Conditional Data Watchpoint), displays the action point ID, the amount of memory being watched, and the location being watched. If you select a watchpoint, TotalView toggles the enabled/disabled state of the watchpoint. 376 Chapter 16: Setting Action Points
Watching Memory Using Watchpoints A watchpoint tracks a memory location—it does not track a variable. This means that a watchpoint might not perform as you would expect it to when watching stack or automatic variables. For example, suppose that you want to watch a variable in a subroutine. When control exits from the subroutine, the memory allocated on the stack for this subroutine is deallocated. At this time, TotalView is watching unallocated stack memory. When the stack memory is reallocated to a new stack frame, TotalView is still watching this same position. This means that TotalView triggers the watchpoint when something changes this newly allocated memory. Also, if your program reinvokes a subroutine, it usually executes in a different stack location. TotalView cannot monitor changes to the variable because it is at a different memory location. All of this means that in most circumstances, you shouldn’t place a watchpoint on a stack variable. If you need to watch a stack variable, you will need to create and delete the watchpoint each time your program invokes the subroutine. This doesn’t mean you can’t place a watchpoint on a stack or heap variable. It just means that what happens is undefined after this memory is released. For example, after you enter a routine, you can be assured that memory locations are always tracked accurately until the memory is released. In some circumstances, a subroutine may be called from the same location. This means that its local variables might be in the same location. So, you might want to try. If you place a watchpoint on a global or static variable that is always accessed by reference (that is, the value of a variable is always accessed using a pointer to the variable), you can set a watchpoint on it because the memory locations used by the variable are not changing. Triggering Watchpoints When a watchpoint triggers, the thread’s program counter (PC) points to the instruction following the instruction that caused the watchpoint to trigger. If the memory store instruction is the last instruction in a source statement, the PC points to the source line following the statement that triggered the watchpoint. (Breakpoints and watchpoints work differently. A breakpoint stops before an instruction executes. In contrast, a watchpoint stops after an instruction executes.) Using Multiple Watchpoints If a program modifies more than one byte with one program instruction or statement, which is normally the case when storing a word, TotalView triggers the watchpoint with the lowest memory location in the modified region. Although the program might be modifying locations monitored by other watchpoints, TotalView only triggers the watchpoint for the lowest memory TotalView Users Guide: version 8.7 377
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TotalView Users Guide version 8.7
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Book Overview part I - Introduction
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Contents About This Book TotalView
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Setting Preferences, Options, and X
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Installation Notes ................
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Starting Processes and Threads ....
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Displaying Allocated Arrays........
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Using Built-In Statements .........
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Figures Chapter 1: Getting Started
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Figure 76. File > Preferences: Bulk
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Chapter 13: Using Groups, Processes
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About This Book This book describes
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How to Use This Book The informatio
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Conventions and what you should cli
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Contacting Us Contacting Us Please
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Part I: Introduction This part of t
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Getting Started Figure 1: The Proce
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Getting Started Figure 3: Setting C
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Getting Started Figure 5: Diving on
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Debugging Multi-process and Multi-t
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Using Groups and Barriers Figure 10
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Introducing the CLI Introducing the
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A Couple of Processes Figure 14: A
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Threads Figure 18: Threads Threads
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Types of Threads Figure 20: Four Pr
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Organizing Chaos Figure 23: User, S
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Organizing Chaos Figure 25: Five Pr
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Creating Groups Figure 27: Step 1:
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Creating Groups Figure 30: Step 5:
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Simplifying What You’re Debugging
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Simplifying What You’re Debugging
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c h a p t e r Getting Started with
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Figure 36: Remote Display Client Se
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Figure 38: Asking for Password Usin
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Using Remote Display You can, of co
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Figure 42: Local Data in a Stack Fr
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Figure 43: Access By Options Remote
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Figure 44: Remote Host Information
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Figure 47: Saving a Profile Figure
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c h a p t e r Setting Up a Debuggin
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Starting TotalView customer_compili
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Starting TotalView If you type an e
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Starting TotalView Before Version 6
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Figure 53: Start a New Process Load
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Figure 55: Open a Core File Start a
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Figure 57: Thread > Continuation Si
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Figure 59: Setting Command-Line Opt
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Figure 61: Root Window Showing Proc
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Handling Signals Thread > Continuat
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Setting Search Paths Make your chan
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Figure 65: Select Directory Dialog
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Figure 66: File > Preferences Dialo
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Setting Preferences Dynamic Librari
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Setting Preferences Pointer Dive Th
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Setting Preferences Similarly, docu
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c h a p t e r 5 Setting Up Remote D
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Figure 75: File > Preferences: Laun
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Figure 76: File > Preferences: Bulk
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Figure 77: Manual Launching of Debu
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Starting the TotalView Server Manua
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Disabling Autolaunch Setting Bulk S
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Figure 78: Launching tvdsvr Disabli
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Figure 80: Debugging Session Over a
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c h a p t e r 6 Setting Up MPI Debu
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Figure 82: File > New Program Dialo
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Debugging MPICH Applications The MP
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Debugging MPICH Applications 4 Afte
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Starting MPI Issues Starting TotalV
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Figure 86: Tools > Message Queue Gr
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Displaying the Message Queue play i
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Figure 90: Message Queue Window Sho
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Debugging HP MPI Applications This
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Debugging IBM MPI Parallel Environm
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Debugging IBM MPI Parallel Environm
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Debugging LAM/MPI Applications the
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Debugging SiCortex MPI Applications
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Debugging Sun MPI Applications mapp
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Figure 91: Group > Attach Subset Di
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Debugging Parallel Applications Tip
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Debugging Parallel Applications Tip
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c h a p t e r 7 Setting Up Parallel
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Debugging OpenMP Applications � T
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Figure 95: OpenMP Shared Variable T
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Figure 96: OpenMP THREADPRIVATE Com
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Figure 98: Cell Architecture PPE PP
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Figure 100: Root Window for a Cell
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Figure 103: Register Union Debuggin
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Debugging Cray XT Applications For
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Debugging SiCortex Applications Her
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Debugging Global Arrays Application
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Debugging PVM (Parallel Virtual Mac
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Debugging PVM (Parallel Virtual Mac
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Figure 106: PVM Tasks and Configura
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Figure 107: SHMEM Sample Session
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Figure 108: A Sliced UPC Array Figu
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Figure 111: Pointer to a Shared Var
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Part III: Using the GUI The two cha
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c h a p t e r Using TotalView Windo
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Figure 112: Root Window Figure 113:
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Figure 115: Sorted and Aggregated R
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Figure 117: Line Numbers with Stop
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Figure 119: Assembly Only (Symbolic
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Figure 122: Backward and Forward Bu
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Figure 124: File > Save Pane Dialog
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c h a p t e r 9 Visualizing Program
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Command Summary Visualizing Array D
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Figure 127: A Three- Dimensional Ar
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Figure 129: Graph and Surface Visua
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Figure 130: Visualizer Graph View W
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Figure 134: A Surface View of a Sin
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Visualizing Array Data Manipulating
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Visualizing Array Data quickly see
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Visualizing Array Data different vi
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Part IV: Using the CLI The chapters
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c h a p t e r Using the CLI 10 The
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Using the CLI Interface Starting th
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# source make_actions.tcl # dload f
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About CLI Output About CLI Output A
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Using Namespaces Using Namespaces C
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How Parallelism Affects Behavior Ho
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Controlling Program Execution Typic
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c h a p t e r 11 Seeing the CLI at
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Initializing an Array Slice Initial
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Writing an Array Variable to a File
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} } Automatically Setting Breakpoin
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Part V: Debugging The chapters in t
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c h a p t e r Debugging Programs 12
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Figure 141: View > Lookup Variable
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Figure 146: View > Lookup Function
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Manipulating Processes and Threads
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Figure 150: The Threads Tab Updatin
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Why breakpoints don’t work (part
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Examining Groups Manipulating Proce
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Manipulating Processes and Threads
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Figure 155: Stepping Illustrated Us
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Executing to a Selected Line If the
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Killing (Deleting) Programs 3 Conti
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Figure 158: Tools > Debugger Loaded
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Figure 160: File > Preferences: Dyn
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Setting the Program Counter some co
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c h a p t e r Using Groups, Process
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Stepping (Part I) � Set breakpoin
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Understanding Thread Width Stepping
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Understanding Process/Thread Sets S
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Specifying Arenas Setting Process a
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Figure 163: Width Specifiers Settin
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Setting Group Focus � Lockstep Gr
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Specifier Specifies Setting Group F
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‘All’ Does Not Always Mean ‘A
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The following are some additional e
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Setting Group Focus Although the lo
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Naming Lists with Inconsistent Widt
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Using P/T Set Operators Using P/T S
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Figure 164: Group > Custom Groups D
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c h a p t e r Examining and Changin
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Figure 167: List and Vector Transfo
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Figure 169: A Tooltip Displaying Va
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Displaying Variables since the vari
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Figure 173: Variable Window Showing
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Displaying Variables Scoping Issues
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Figure 177: Program Browser and Var
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Figure 179: Diving on Local Variabl
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Figure 181: View > Examine Format >
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Figure 184: Variable Window with Ma
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Figure 185: Undive/Redive Buttons F
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Figure 188: Displaying C Structures
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Figure 190: The Tools > Expression
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Figure 193: Expression List Window
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Figure 197: Using Functions in the
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Viewing a List of Variables (or sel
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Figure 199: Using an Expression to
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Figure 200: Three Casts Changing a
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Changing a Variable’s Data Type W
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Changing a Variable’s Data Type T
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Figure 202: Displaying wchar_t Data
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Changing the Address of Variables D
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Figure 204: Displaying C++ Classes
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Page 379 and 380: Visualizing Array Data Visualizing
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Page 419 and 420: Using Programming Language Elements
Page 421 and 422: Using the Evaluate Window Using the
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Page 429 and 430: Glossary ACTION POINT: A debugger f
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PVM groups, unrelated to process gr
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stride elements 334 UPC 158 upper b
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threads model 18 threads tab 230 th
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View > Compilation Scope commands 2
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