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Debugging IBM Blue Gene Applications 3 Locate the process you want to debug and dive on it. TotalView responds by opening a Process Window for it. If your source code files are not displayed in the Source Pane, you might not have told TotalView where these files reside. You can fix this by invoking the File > Search Path command to add directories to your search path. Attaching from a Node Not Running poe The procedure for attaching TotalView to poe from a node that is not running poe is essentially the same as the procedure for attaching from a node that is running poe. Since you did not run TotalView from the node running poe (the startup node), you won’t be able to see poe on the process list in the Root Window and you won’t be able to start it by diving into it. To place poe in this list: 1 Connect TotalView to the startup node. For details, see “Setting Up and Starting the TotalView Server” on page 81 and “Attaching to Processes” on page 61. 2 Select the File > New Program dialog box, and select Attach to an existing process. 3 Look for the process named poe and continue as if attaching from a node that is running poe. CLI: dattach -r hostname poe poe-pid Debugging IBM Blue Gene Applications While the way in which you debug IBM Blue Gene MPI programs is identical to the way in which you debug these programs on other platforms, starting TotalView on your program differs slightly. Unfortunately, each machine is configured differently so you’ll need to find information in IBM’s documentation or in documentation created at your site. Nevertheless, the remainder of this section will present some hints. In general, you will either launch mpirun under debugger control or start TotalView and attach to an already running mpirun. For example: { totalview | totalviewcli } mpirun –a mpirun-command-line TotalView tells mpirun to launch TotalView Debug Servers on each Blue Gene I/O nodes. Because I/O nodes cannot resolve network names, TotalView must pass the address of the front-end node interface to the servers on the I/O nodes. This is usually not the same interface that is generally used to connect to 118 Chapter 6: Setting Up MPI Debugging Sessions
Debugging LAM/MPI Applications the front-end node. TotalView assumes that the address can be resolved by using a name that is: front-end-hostname-io. For example, if the hostname of the front-end is fred, the servers will connect to fred-io. The systems at the IBM Blue Gene Capacity on Demand follow this convention. If you are executing programs there, you will not need to set the TotalView variables described in the rest of this section. If the front-end cannot resolve this name, you must supply the name of the interface using the –local_interface command-line option or by setting the bluegene_io_interface TotalView variable. (This variable is described in the Chapter 4 of the TotalView Reference Guide.) Because the same version of TotalView must be able to debug both Power- Linux programs (for example, mpirun) and Blue Gene programs, TotalView uses a Blue Gene-specific server launch string. You can define this launch string by setting the bluegene_server_launch_string TotalView variable or command-line option. You must set this variable in a tvdrc file. This differs from other TotalView launch strings, which you can set using the File > Preferences Dialog Box. The default value for the bluegene_server_launch_string variable is: –callback %L –set_pw %P -verbosity %V %F In this string, %L is the address of the front-end node interface used by the servers. The other substitution arguments have the same meaning as they do in a normal server launch string. These substitution arguments are discussed in Chapter 7 of the TotalView Reference Guide. Debugging LAM/MPI Applications In many cases, you can bypass the procedure described in this section. For more information, see “Debugging MPI Programs” on page 98. The following is a description of the LAM/MPI implementation of the MPI standard. Here are the first two paragraphs of Chapter 2 of the “LAM/MPI User’s Guide”. You can find You can obtain this document by going to the LAM documentation page, which is: http://www.lam-mpi.org/using/docs/. “LAM/MPI is a high-performance, freely available, open source implementation of the MPI standard that is researched, developed, and maintained at the Open Systems Lab at Indiana University. LAM/MPI supports all of TotalView Users Guide: version 8.6 119
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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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Page 107 and 108: Setting Preferences Dynamic Librari
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Page 121 and 122: Starting the TotalView Server Manua
Page 123 and 124: Disabling Autolaunch Setting Bulk S
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Page 129 and 130: c h a p t e r 6 Setting Up MPI Debu
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Page 133 and 134: Debugging MPICH Applications The MP
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Page 137 and 138: Starting MPI Issues Starting TotalV
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Page 159 and 160: Debugging Parallel Applications Tip
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Page 163 and 164: c h a p t e r 7 Setting Up Parallel
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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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