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2021.3
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  1. Analyze Timeline Profiling Results
  2. Call Stack
  3. Methods and Subsystems

Methods and Subsystems

Last modified: 01 October 2021

Methods and Subsystems shows the list of methods from all selected threads sorted by execution time.

Use Methods and Subsystems in conjunction with other filters to determine "top" methods by a certain condition. For example, to see "top" methods by file operations time, select the File Operations event in Events.

Top methods 1

Pos 1 The percentage of call execution time (total or own depending on the selected sorting) relative to the total selected time. If Follow selection in Call Tree is enabled, then relative to the total time of the call subtree selected in Call Tree.

Pos 2 Short method name.

Pos 3 Total / Own + System or Total / Own call execution time. See the details on how this time is calculated below.

Pos 4 Full method name.

Follow selection in Call Tree
If this option is enabled, methods and subsystems are calculated for the node that is currently selected in Call Tree. Otherwise, methods and subsystems are calculated for the currently selected time intervals.

Hide system functions
See the details on this option below.

Subsystems
Subsystems allow you to quickly understand how the call time is distributed among various components: user and system code, WPF, LINQ, and others. The subsystems bar in Methods and Subsystems visualizes the data from the Subsystems filter.

How call time is calculated

If Hide system functions icon Hide system functions is enabled, Total call time is calculated as a sum of method's own time and time of all child calls.

Own + System time is calculated as a sum of method's own time and the time of all child system methods (down to the next user method in the stack).

If Hide system functions icon Hide system functions is disabled, system methods are shown in the list separately. In this case, method's Own time does not include the time of child system calls.

For better understanding, consider the example.

Tv plain list 2

If Hide system functions icon Hide system functions is enabled, Methods and Subsystems calculates time (Total / Own + System) as follows:

Methods and subsystems own system example

If Hide system functions icon Hide system functions is disabled, Methods and Subsystems calculates time (Total / Own) as follows:

Methods and subsystems own example

Navigating to source code

To navigate to a method declaration in the source code

  1. Select the method.

  2. Press Enter or choose the Navigate to Code (Timeline Viewer integrated in Visual Studio) or Show Code (standalone Timeline Viewer) item in the context menu.

(Visual Studio integrated viewer) To navigate from the source code to Call Tree and apply a filter by all method occurrences

  • In the source code in Visual Studio, do one of the following:

    • Right-click a method name and in the context menu, select Navigate To | Locate in Performance Snapshot.

    • Set the caret at the method name or anywhere inside the method and press Alt+Shift+S.

      Known issue in dotTrace 10.0.2: After installing dotTrace, the shortcut does not work until you reapply ReSharper's current keyboard scheme. To do so, in ReSharper | Options… | Environment | Keyboard, click Apply Scheme.

    This also applies a filter by method occurrences and their subtrees.

Opening methods in Call Tree

To show all method occurrences in Call Tree and apply a filter by method's total time

  1. Select a method.

  2. Press Ctrl + Shift + Enter, click on the method's total time link or choose the Merge Method Occurrences item in the context menu.

After this, the method becomes a root node in Call Tree containing call subtrees of all its occurrences. This also applies a filter by method occurrences and their subtrees.

To show all method occurrences in Call Tree and apply a filter by method's own time

  1. Select a method.

  2. Click on the method's own time link or choose the Filter by method's own time item in the context menu.

After this, the method becomes a root node in Call Tree and a filter by method's own time is applied. Note that all child calls are excluded from the subtree in this case.

Viewing method's backtraces

Sometimes, it may be helpful to quickly view backtraces (an inverted call tree) of a particular method to identify its origin.

To quickly view backtraces of a particular method

  1. Hover the mouse over the method.

  2. Click the arrow symbol Async calls arrow on the left.

https://resources.jetbrains.com/help/img/dotnet/2021.3/backtraces_top_methods.png
Gif

Sorting methods

To sort the list by total or own time

  • Click on the Total / Own time link on the top of the Methods and Subsystems window.