TotalView

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TotalView
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TotalViewNew Product Introduction

• ReplayEngine
• Until now, debugging always meant running only
  forward to (hopefully) reach your problem
• But unfortunately, just one step too far often
  means having to start over again from the
  beginning, and hoping the program behavior will
  be the same!
• With ReplayEngine, you can simply unstep back
  through the program and seek out its cause -
  deterministically!
• Replay gives you a second chance to see what
  happened earlier in your program - and without
  starting over.

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TotalViewNew Product Introduction

• ReplayEngine
• Captures full execution history
• Record all external input
• Record other sources of non-determinism
• Replay execution
• Replay the execution along exactly the same
  trajectory
• Can reset to any point along the path already
  taken
• Everything is managed by the tool
• The user just chooses where to go
• Back into or over functions, one line, or to the
  beginning
• There is some overhead
• Lots of clever tricks are used to reduce overhead
• Provides Determinism within a debugging session

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TotalViewNew Product Introduction

• Navigation with ReplayEngine
• - an Intuitive User Interface -

Step forward over functions
Step backward over functions
Step forward into functions
Step backward into functions
Advance forward out of current Function, after
the call
Advance backward out of current Function, to
before the call
Advance forward to selected line
Advance backward to selected line
Advance forward to live session
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TotalViewNew Product Introduction

• ReplayEngine

New Toolbar
No Replay? (or not running)
No Active Buttons!
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TotalViewNew Product Introduction

• ReplayEngine
• Consider the following very difficult program
  scenario
• A crash occurs that destroys the stack backtrace,
  giving no information leading up to the problem
• ReplayEngine can be used to work backwards from
  the crash, and even to observe the stack recreate
  itself, providing the critical information on
  where and how the problem began.
• The ReplayEngine provides the ability to review
  any part of the program execution to see all
  variables and function calls, from the beginning
  of the run to the current time

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ReplayEngine Scenarios

• Especially useful in scenarios that include
• Any crash that destroys the stack backtrace
• Race conditions with multi-threaded programs
• Server applications responding to network input
• Hard-to-reproduce GUI errors
• Crashes with invalid pointers
• Crashes involving write-after-free errors
• Examining complex functions and subroutines
• Writing past the end of an array
• Errors that depend sensitively on input
• We see these kinds of scenarios in
• Commercial applications
• Technical computing
• Education
• Scientific programming
• Network programming

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TotalView Technologies

• Contato
• Alfredo Leon
• alfredo.leon_at_tecpartner.com.br
• Ariani Félix
• ariani.felix_at_tecpartner.com.br
• Telefones (11)5183-6579
• (11)5183-4066