Intel 编译器线程安全检查真心的很详细转

Managing Threading Errors with Intel® Parallel Inspector XE

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Parallelism Tools – Checking for Thread Correctness 1

Activity 1 - Choose, Build and Run a project 1

Activity 2 - Configure and Run Analysis 9

Activity 3 - Manage result data after analysis 13

Activity 4 - Resolve, Rebuild and Rerun 21

Parallelism Tools – Checking for Thread Correctness

Activity 1 – Choose, Build and Run a Project

Time Required

Ten minutes

Objective

Learn how to open and build a project in Microsoft Visual Studio*

The application is a 2-D ray tracer/renderer called tachyon written in C++. The code is small enough that you may be able to identify potential memory access violations by visual inspection. If you identify and make a list of problems, check your list with the list that Parallel Inspector XE identifies.

Activity 2 – Configure and Run analysis

Time Required

Ten minutes

Objective

Learn how to choose and run a threading error analysis to detect deadlocks and data races that may need handling.

Configure a threading error analysis

From the Visual Studio* menu, choose Tools > Intel Inspector XE 2011 > New Analysis to display an Analysis Type window similar to the following:
Open the Threading Error Analysis folder and choose the Detect Deadlocks and Data Races analysis type to display a window similar to the following. (If necessary, click the icon in the Details region to display analysis type characteristics.)

	Use the Navigation toolbar to navigate among Inspector XE windows. The buttons on the toolbar vary depending on the displayed window.
	The Analysis Types region shows available preset analysis types. You can also use existing analysis types as templates to create custom analysis types.
	Use the checkbox(es) and drop-down field(s) to fine-tune some, but not all, analysis type characteristics. If you need to fine-tune more analysis type characteristics, choose another preset analysis type or create a custom analysis type.
	The Details region shows all current analysis type characteristics. Try choosing a different preset analysis type or checkbox/drop-down list value to see the impact on the Details region.
	Use the Command toolbar to control analysis runs and perform other functions. For example, use the Project Properties button to redisplay the Project Properties dialog box.

After you finish experimenting, ensure your Analysis Type window resembles the following window:
You chose a preset analysis type of intermediate scope to detect memory errors in the find_and_fix_memory_errors.exe file.

Run a threading error analysis

Click the Analyze button on the Analysis Type window to:

Execute the find_and_fix_threading_errors.exe file.
Identify memory errors that may need handling.
Collect the result in a folder in the tachyon_insp_xe\vc8\My Inspector XE 2011 Project - find_and_fix_threading_errors folder.
Finalize the result (convert symbol information into filenames and line numbers, perform duplicate elimination, and form problem sets).

During collection, the Inspector XE displays a Collection Log window similar to the following:

	The Visual Studio* IDE offers a pointer to the result from the Solution Explorer to provide easy future access. Here, the Visual Studio* IDE created a My Inspector XE Results/find_and_fix_threading_errors folder in the Solution Explorer. Open it to see the pointer to the r000ti2 result.
	The result name appears in the tab. Here, the name of the result (and the name of the result folder in the tachyon_insp_xe\vc8\My Inspector XE 2011 Project - find_and_fix_threading_errors folder) is r000mi2, where r = constant, 000 = next available number, ti = memory error analysis type, 2 = preset analysis type of intermediate scope
	The Collection Log pane shows detected problems in real time. This tutorial does not cover examining and solving problems during collection. For more details, please check the Inspector XE Help Index for examine result during analysis.
	The Collector Messages pane shows analysis status messages. You can control where application output appears: Separate console window (as in this tutorial), Application Output pane in the Collection Log window, or Visual Studio* output window.

Activity 3 – Manage result data after analysis

Time Required

Fifteen minutes

Objective

Learn how to manage result data after analysis is complete

After analysis (both collection and finalization) completes successfully, the Inspector XE displays the Summary window:

Choose Problem Set

Start exploring a threading error.

Interpret the Summary window

	The Summary window is the starting point for managing result data. It groups observations into problem sets, and then prioritizes the problem sets by severity and size. Notice the arrow to the left of the Analysis Type button. Use it to revisit a read-only window showing your target project properties.
	Think of the Problem Sets pane as a to-do list. Start at the top and work your way down.
	The Observations in Problem Set pane shows all the observations in all the problems in the selected problem set. By default, the Inspector XE selects the first problem set for you. Here, the Inspector XE selected the Invalid Memory Access problem set, which contains one problem composed of a Write observation.
	This tutorial does not cover manipulating the timeline. For more details, check the Inspector XE Help Index for manipulate timeline.
	The Summaries/Subsets pane categorizes all displayed problem sets by specific criteria. Use it to temporarily limit the list in the Problem Sets pane to only those problem sets that meet specific criteria. This tutorial does not cover searching for specific problem sets. For more details, check the Inspector XE Help Index for select/problem set search criteria.

Choose a problem set

Click the data row for the Data race problem set in the find_and_fix_threading_errors.cpp source file to display a window similar to the following:

This Data race problem set contains one or more problems composed of Read and Write observations.

Choose a focus observation

Double-click the data row for the X2 Write observation to display the Sources window, which provides more visibility into the error:

Interpret Result Data

In this section, we will see how to determine the cause of the detected threading error.

To interpret the Sources window:

Like the pane on the Summary window, the Observations in Problem Set pane shows all the observations in one Write -> Write Data race problem and three Write -> Read Data race problems in the Data race problem set.

There are at least two observations in each problem. The X2 Write observation is in all problems.

Observations	One Write -> Write Data Race Problem	Three Write -> Read Data Race Problems
X2 Write	Represents the instruction and associated call stack of the thread responsible for a memory write.
X12 Write	Represents the instruction and associated call stack of the thread responsible for a concurrent memory write.
X3 Read X4 Read X5 Read		Represent the instruction and associated call stack of the thread responsible for a concurrent memory read.

The Related Observation Code pane shows the source code in the find_and_fix_threading_errors.cpp source file surrounding the X3 Read observation. (Notice the icon in the pane title matches the icon on the X3 Read observation data row in the Observations in Problem Set window.) The source code corresponding to the X3 Read observation is highlighted.

The Focus Observation Code pane shows the source code in the find_and_fix_threading_errors.cpp source file surrounding the X2 Write observation. (Notice the icon in the pane title matches the icon on the X2 Write observation data row in the Observations in Problem Set window.) The source code corresponding to the X2 Write observation is highlighted.

This tutorial does not cover manipulating the timeline. For more details, check the Inspector XE Help Index for manipulate timeline

To interpret window icons:

Icon	Meaning
	This observation is the focus observation. The Inspector XE chose it for you when you double-clicked the Mismatched allocation/deallocation problem set on the Summary window. Its source code is currently displayed in the Focus Observation Code pane.	Observation source code is available for viewing in the Inspector XE and editing in the Visual Studio* editor.
	This observation is related to the focus observation. Its source code is currently displayed in the Related Observation Code pane.