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Setting the Program Counter Figure 161: Load All Symbols in Stack Context menu library’s symbols, it cannot honor a request to not load in symbols, so it ignores a request to not read them. CLI: dset TV::dll_read_all_symbols dset TV::dll_read_loader_symbols_only dset TV::dll_read_no_symbols See the online Help for additional information. If your program stops in a library that has not already had its symbols read, TotalView reads the library’s symbols. For example, if your program SEGVs in a library, TotalView reads the symbols from that library before it reports the error. In all cases, however, TotalView always reads the loader symbols for shared system libraries. Reading Excluded Information While you are debugging your program, you might find that you do need the symbol information that you told TotalView that it shouldn’t read. Tell TotalView to read them by right-clicking your mouse in the Stack Trace Pane and then selecting the Load All Symbols in Stack command from the context menu. (See Figure 161.) After selecting this command, TotalView examines all active stack frames and, if it finds unread libraries in any frame, TotalView reads them. CLI: TV::read_symbols This CLI command also gives you finer control over how TotalView reads in library information. Setting the Program Counter TotalView lets you resume execution at a different statement than the one at which it stopped execution by resetting the value of the program counter (PC). For example, you might want to skip over some code, execute 248 Chapter 12: Debugging Programs
Setting the Program Counter some code again after changing certain variables, or restart a thread that is in an error state. Setting the PC can be crucial when you want to restart a thread that is in an error state. Although the PC symbol in the line number area points to the source statement that caused the error, the PC actually points to the failed machine instruction in the source statement. You need to explicitly reset the PC to the correct instruction. (You can verify the actual location of the PC before and after resetting it by displaying it in the Stack Frame Pane, or displaying both source and assembler code in the Source Pane.) In TotalView, you can set the PC of a stopped thread to a selected source line or a selected instruction. When you set the PC to a selected line, the PC points to the memory location where the statement begins. For most situations, setting the PC to a selected line of source code is all you need to do. To set the PC to a selected line: 1 If you need to set the PC to a location somewhere in a line of source code, select the View > Source As > Both command. TotalView responds by displaying assembler code. 2 Select the source line or instruction in the Source Pane. TotalView highlights the line. 3 Select the Thread > Set PC command. TotalView asks for confirmation, resets the PC, and moves the PC symbol to the selected line. When you select a line and ask TotalView to set the PC to that line, TotalView attempts to force the thread to continue execution at that statement in the currently selected stack frame. If the currently selected stack frame is not the top stack frame, TotalView asks if it can unwind the stack: This frame is buried. Should we attempt to unwind the stack? If you select Yes, TotalView discards deeper stack frames (that is, all stack frames that are more deeply nested than the selected stack frame) and resets the machine registers to their values for the selected frame. If you select No, TotalView sets the PC to the selected line, but it leaves the stack and registers in their current state. Since you can’t assume that the stack and registers have the right values, selecting No is almost always the wrong thing to do. TotalView Users Guide: version 8.7 249
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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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Page 233 and 234: Using the CLI Interface Starting th
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Page 237 and 238: About CLI Output About CLI Output A
Page 239 and 240: Using Namespaces Using Namespaces C
Page 241 and 242: How Parallelism Affects Behavior Ho
Page 243 and 244: Controlling Program Execution Typic
Page 245 and 246: c h a p t e r 11 Seeing the CLI at
Page 247 and 248: Initializing an Array Slice Initial
Page 249 and 250: Writing an Array Variable to a File
Page 251 and 252: } } Automatically Setting Breakpoin
Page 253 and 254: Part V: Debugging The chapters in t
Page 255 and 256: c h a p t e r Debugging Programs 12
Page 257 and 258: Figure 141: View > Lookup Variable
Page 259 and 260: Figure 146: View > Lookup Function
Page 261 and 262: Manipulating Processes and Threads
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Page 265 and 266: Why breakpoints don’t work (part
Page 267 and 268: Examining Groups Manipulating Proce
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Page 271 and 272: Figure 155: Stepping Illustrated Us
Page 273 and 274: Executing to a Selected Line If the
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Page 285 and 286: Stepping (Part I) � Set breakpoin
Page 287 and 288: Understanding Thread Width Stepping
Page 289 and 290: Understanding Process/Thread Sets S
Page 291 and 292: Specifying Arenas Setting Process a
Page 293 and 294: Figure 163: Width Specifiers Settin
Page 295 and 296: Setting Group Focus � Lockstep Gr
Page 297 and 298: Specifier Specifies Setting Group F
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Page 307 and 308: Using P/T Set Operators Using P/T S
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Page 311 and 312: c h a p t e r Examining and Changin
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Page 321 and 322: Displaying Variables Scoping Issues
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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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Figure 205: Diving on a Common Bloc
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Figure 207: Fortran 90 User- Define
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Displaying Thread Objects that has
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Figure 210: Variable Window: Showin
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c h a p t e r Examining Arrays 15 T
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Examining and Analyzing Arrays This
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Figure 213: An Array Slice and an A
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Figure 214: Array Data Filtering by
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Figure 216: Array Data Filtering by
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Figure 218: Array Statistics Window
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Figure 219: Viewing Across Threads
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Visualizing Array Data Visualizing
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c h a p t e r 16 Setting Action Poi
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Figure 222: Action Point Tab Settin
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Figure 224: Setting Breakpoints on
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Figure 227: Ambiguous Function Dial
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Figure 229: Action Point > At Locat
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Figure 232: PC Arrow Over a Stop Ic
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Setting Breakpoints and Barriers at
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Setting Breakpoints and Barriers Ab
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Setting Breakpoints and Barriers Wh
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Defining Eval Points and Conditiona
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Defining Eval Points and Conditiona
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Figure 236: Stopped Execution of Co
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Using Watchpoints Platform Assemble
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Using Watchpoints Computer Constrai
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Watching Memory Using Watchpoints A
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The following is an expression that
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c h a p t e r Evaluating Expression
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Why is There an Expression System?
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Figure 240: Expression List Window:
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Using Programming Language Elements
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Using the Evaluate Window Using the
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Figure 244: Evaluating Information
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Using the Evaluate Window Pseudo Op
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Using Built-in Variables and Statem
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Glossary ACTION POINT: A debugger f
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off the function reference to an ev
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DOPE VECTOR: This is a run time des
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INITIALIZATION FILE: An optional fi
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PARCEL: The number of bytes require
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threads. There are two kinds of ser
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SYMBOL NAME: The name associated wi
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Index Symbols # scope separator cha
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array structure viewing limitations
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context 138 description 140 empty c
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Tools > Watchpoint 10, 378 totalvie
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into a stack frame 174 into a struc
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-file command-line option to Visual
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see alsoshared libraries limitation
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expressions 275 set of arenas 259 s
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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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