Call Graph
The
Call Graph
tab shows a small part of the call graph for each process or
process group: a single node (called central function) with its inbound and outbound
edges. Each process entry has three children: the Callers, the central function, and
the Callees.Navigating through the
Call Graph
, double-click on a caller or callee and
press the space bar or the Enter key to select the respective function as the
central node.The time shown for the central function is the same as shown in the
Flat Profile
tab and the Load Balance
tab. The time shown for the
callers represents the time spent in the central function when called from the
respective function.If your application uses a function in different contexts (for example, different
algorithms use the function), you can observe which algorithm causes a function to
consume more or less time. In the
Call Graph
, you can see which caller is
responsible for most of the time spent in MPI: it is the function group Application
(and not Forward, Adjoin, cg, or Smoother). If the call tree gets too big to
navigate through, use the Call Graph
to find places in the code that cause
expensive calls.