TotalView Users Guide - CI Wiki

Figure 219: Viewing Across
Threads
Displaying a Variable in all Processes or Threads
Displaying a Variable in all Processes
or Threads
When you’re debugging a parallel program that is running many instances
of the same executable, you usually need to view or update the value of a
variable in all of the processes or threads at once.
Before displaying a variable’s value in all threads or processes, you must
display an instance of the variable in a Variable Window. After TotalView displays
this window, use one of the following commands:
� View > Show Across > Process, displays the value of the variable in all
processes.
� View > Show Across > Thread, displays the value of a variable in all
threads within a single process.
� View > Show Across > None, returns the window to what it was before
you used other Show Across commands.
You cannot simultaneously Show Across processes and threads in the same Variable
Window.
After using one of these commands, the Variable Window switches to an
array-like display of information, and displays the value of the variable in
each process or thread. Figure 219 shows a simple, scalar variable in each
of the processes in an OpenMP program.
When looking for a matching stack frame, TotalView matches frames starting
from the top frame, and considers calls from different memory or stack
locations to be different calls. For example, the following definition of
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