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Parallel Stacks Window
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The Parallel Stacks window enables you to visualize multiple call stacks within one window. It operates in two modes, Task or Thread, which can be changed in the drop-down menu in the left corner. We will take a look at the Thread mode (the Task mode is very similar, but shows only tasks), so make sure that Threads is selected in the drop-down menu.
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Figure 5-6. Parallel Stacks window: Thread view At first the Parallel Stacks window can look a bit confusing: Threads are grouped together by the method (context) they are currently in, indicated by a box. The blue border around a box shows that the current thread belongs to that box. The yellow arrow indicates the active stack frame of the currently executing thread (in this case, the main method).
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Figure 5-7 shows the Parallel Stacks window operating in Task mode.
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PARALLELIZATION AND THREADING ENHANCEMENTS
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Figure 5-7. Parallel Stack window: Task view The Parallel Stacks window offers the following functionality: If you hover the mouse over a box, the current associated thread ID will be shown in the tooltip. You can jump to the individual associated frames by right-clicking a box and selecting Switch To Frame on the context menu. If a box is associated to only one thread (indicated by 1 in the boxes header), you can double-click the box to be taken to the code associated with that stack frame.
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There are a number of view options on the Parallel Stacks window. Reading from left to right, they are as follows: Show only flagged: Filters whether currently flagged tasks are displayed. Toggle Method view: Select a box on the diagram and then select this option. The current method then appears in the center of the view, showing the methods that call and are called from this method. Toggle top down/bottom up display: The default is that the initial thread is shown at the base of the view with subsequent calls above it. Select this option to invert the display. AutoScroll option: Moves the windows focus automatically as you step through the code to the currently executing frame. Toggle Zoom Control option: Controls whether to display zoom control to the left of the diagram. Note that you can zoom in and out by pressing Ctrl and moving the mouse scroll wheel. Birds-eye view button: On larger diagrams, when scroll bars are visible in the Parallel Stacks window, you can click between them to quickly move around the diagram Individual threads: Right-clicking on an individual thread brings up a context menu that allows you to switch to the task, frame, source code, setup symbols, and so on.
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NOTE Daniel Moth has recorded some great screen casts and written some excellent articles on parallel debugging at http://www.danielmoth.com/Blog/2009/11/parallel-debugging.html.
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PLINQ (Parallel LINQ)
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PLINQ is the parallelized version of LINQ to objects and supports all existing LINQ operators and functionality with a few new options for fine-grained control of parallelization functionality. The new functionality has been introduced through the interface IParallelEnumerable<T>> that inherits from IEnumerable<T>>. At the time of writing, LINQ to SQL and LINQ to Entities will not benefit from parallelization because in these cases the query is executed on the database or the provider, so .NET cannot parallelize it.
Why Not Parallelize All LINQ Queries Automatically
Parallelizing LINQ queries automatically is potentially the ultimate goal for LINQ, but it can introduce some issues (particularly around ordering), so at present you have to opt in to the parallel model.
A WORD OF WARNING
When using PLINQ, it is important to ensure that your query does not modify the result set because this might have unforeseen effects if values are utilized later in the query. PLINQ will do its best to work out best how to process the query (including not running it in parallel at all), but do you really want to take the chance of weird, scary, and hardto-reproduce bugs
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