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Types of Threads Figure 20: Four Processors on a Network Figure 21: Threads (again) When there are problems working this way, traditional debuggers and solutions don’t work. TotalView, on the other hand, organizes this mass of executing procedures for you and lets you distinguish between threads and processes that the operating system uses from those that your program uses. Types of Threads All threads aren’t the same. The following figure shows a program with three threads. (See Figure 21.) A thread Assume that all of these threads are user threads; that is, they are threads that perform some activity that you’ve programmed. 20 Chapter 2: About Threads, Processes, and Groups
Figure 22: User and Service Threads Types of Threads Many computer architectures have something called user mode, user space, or something similar. User threads means something else. The TotalView definition of a user thread is simply a unit of execution created by a program. Because the program creates user threads to do its work, they are also called worker threads. Other threads can also be executing. For example, there are always threads that are part of the operating environment. These threads are called manager threads. Manager threads exist to help your program get its work done. In the following figure, the horizontal threads at the bottom are user-created manager threads. User Thread Manager Thread All threads are not created equal and all threads do not execute equally. Many programs also create manager-like threads. Since these user-created manager threads perform services for other threads, they are called service threads. (See Figure 23 on page 22.) These service threads are also worker threads. For example, the sole function of a user service thread might be to send data to a printer in response to a request from the other two threads. One reason you need to know which of your threads are service threads is that a service thread performs different types of activities than your other threads. Because their activities are different, they are usually developed separately and, in many cases, are not involved with the fundamental problems being solved by the program. Here are two examples: � The code that sends messages between processes is far different than the code that performs fast Fourier transforms. Its bugs are quite different than the bugs that create the data that is being transformed. � A service thread that queues and dispatches messages sent from other threads might have bugs, but the bugs are different than the rest of your code and you can handle them separately from the bugs that occur in nonservice user threads. TotalView Users Guide: version 8.7 21
Page 1 and 2: TotalView Users Guide version 8.7
Page 3 and 4: Book Overview part I - Introduction
Page 5 and 6: Contents About This Book TotalView
Page 7 and 8: Setting Preferences, Options, and X
Page 9 and 10: Installation Notes ................
Page 11 and 12: Starting Processes and Threads ....
Page 13 and 14: Displaying Allocated Arrays........
Page 15 and 16: Using Built-In Statements .........
Page 17 and 18: Figures Chapter 1: Getting Started
Page 19 and 20: Figure 76. File > Preferences: Bulk
Page 21 and 22: Chapter 13: Using Groups, Processes
Page 23 and 24: About This Book This book describes
Page 25 and 26: How to Use This Book The informatio
Page 27 and 28: Conventions and what you should cli
Page 29 and 30: Contacting Us Contacting Us Please
Page 31: Part I: Introduction This part of t
Page 34 and 35: Getting Started Figure 1: The Proce
Page 36 and 37: Getting Started Figure 3: Setting C
Page 38 and 39: Getting Started Figure 5: Diving on
Page 40 and 41: Debugging Multi-process and Multi-t
Page 42 and 43: Using Groups and Barriers Figure 10
Page 44 and 45: Introducing the CLI Introducing the
Page 46 and 47: A Couple of Processes Figure 14: A
Page 48 and 49: Threads Figure 18: Threads Threads
Page 52 and 53: Organizing Chaos Figure 23: User, S
Page 54 and 55: Organizing Chaos Figure 25: Five Pr
Page 56 and 57: Creating Groups Figure 27: Step 1:
Page 58 and 59: Creating Groups Figure 30: Step 5:
Page 60 and 61: Simplifying What You’re Debugging
Page 62 and 63: Simplifying What You’re Debugging
Page 65 and 66: c h a p t e r Getting Started with
Page 67 and 68: Figure 36: Remote Display Client Se
Page 69 and 70: Figure 38: Asking for Password Usin
Page 71 and 72: Using Remote Display You can, of co
Page 73 and 74: Figure 42: Local Data in a Stack Fr
Page 75 and 76: Figure 43: Access By Options Remote
Page 77 and 78: Figure 44: Remote Host Information
Page 79 and 80: Figure 47: Saving a Profile Figure
Page 81 and 82: c h a p t e r Setting Up a Debuggin
Page 83 and 84: Starting TotalView customer_compili
Page 85 and 86: Starting TotalView If you type an e
Page 87 and 88: Starting TotalView Before Version 6
Page 89 and 90: Figure 53: Start a New Process Load
Page 91 and 92: Figure 55: Open a Core File Start a
Page 93 and 94: Figure 57: Thread > Continuation Si
Page 95 and 96: Figure 59: Setting Command-Line Opt
Page 97 and 98: Figure 61: Root Window Showing Proc
Page 99 and 100: 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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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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