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2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 11 Intel® Parallel Inspector Binary Instrumentation Build with supported compiler Running the application Must be run from within Parallel Inspector Application is instrumented when executed External DLLs are instrumented as used 12 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Starting Parallel Inspector Build the Debug version of the application with appropriate flags set 12 Intel® Parallel Inspector 13 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Starting Parallel Inspector Select Parallel Inspector from the Tools menu 13 Intel® Parallel Inspector You can choose to look for Memory Errors Threading Errors 14 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Starting Parallel Inspector The Configure Analysis window pops up 14 Intel® Parallel Inspector Select the level of analysis to be carried out by Parallel Inspector The deeper the analysis, the more thorough the results and the longer the execution time Click Run Analysis 15 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Starting Parallel Inspector The initial (raw) results come up after analysis 15 Intel® Parallel Inspector Click the Interpret Results button to filter the raw data into more human consumable formats 16 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective

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Owners. Starting Parallel Inspector The analysis results are gathered together in related categories 16 Intel® Parallel Inspector Double-click a line from the Problem Sets pane to see the source code that generated the diagnostic 17 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Starting Parallel Inspector The source lines involved in a data race can be shown 17 Intel® Parallel Inspector 18 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 18 Intel® Parallel Inspector Activity 1a - Potential Energy Build and run serial version Build threaded version Run application in Parallel Inspector to identify threading problems 19 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 19 Intel® Parallel Inspector Race Conditions Execution order is assumed but cannot be guaranteed Concurrent access of same variable by multiple threads Most common error in multithreaded programs May not be apparent at all times 20 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 20 Intel® Parallel Inspector Solving Race Conditions Solution: Scope variables to be local to threads When to use Value computed is not used outside parallel region Temporary or “work” variables How to implement OpenMP scoping clauses ( private, shared ) Declare variables within threaded functions Allocate variables on thread stack TLS (Thread Local Storage) API 21 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 21 Intel® Parallel Inspector Solving Race Conditions Solution: Control shared access with critical regions When to use

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Start March.2009, we introduced a series of Intel Parallel Studio webinars. During the live broadcast webcasts, we received numerous questions about this new product. The followings contain Top 5 most asked questions and a detailed list of Q&A from each webinar. We thought these may be useful to you through the product evaluations.. If you are interested in taking recorded webinars, please register it here.Top 5 most asked questions:Q1. What is the difference between Intel Parallel Composer and the usual Intel C++ Compiler Professional?A. Please see A more detailed article will come soon.Q2: What about using Intel C++ to cross-compiling between Mac OSX*/Linux*? A: Intel C++ Compiler Professional Edition products are also available for Linux and Mac OS X. Cross-compiling between these two operating systems is not a supported user-model. You will not be able to cross-compile between OSs. Please see for additional information. Q3: Sure your product target is Intel Platform how about other brand CPUs. When we use your product it will also work in other CPUs without problem and same performance?A: Intel Parallel Studio runs on platforms with an IA-32 or Intel 64 architecture processor supporting the Intel Streaming SIMD Extensions 2 (Intel SSE2) instructions (Intel Pentium 4 processor or later, or compatible non-Intel processor).Q4. Do I need to use Intel VTune Performance analyzer or Intel Thread Checker etc. any more since I found that Intel Parallel Studio can do what VTune analyzer always do?A. VTune analyzer provides additional functionality. For example, VTune Event Based Sampling (the ability to track processor level events) is one such area. The Intel Parallel Amplifier, an Intel Parallel Studio tool, provides information on the performance of your code. Use the Parallel Amplifier to analyze the following types of performance issues in your threaded applications:- Identify the most time-consuming (hot) functions- Locate sections of code that do not effectively utilize available processor time- Determine the best sections of code to optimize for sequential performance and for threaded performance - Locate synchronization objects that affect the program performance- Find whether, where, and why your program spends time on input/output operations - Identify and compare the performance impact of different synchronization methods, different numbers of threads, or different algorithmsQ5. What is the difference between Intel VTune analyzer/Intel Thread Checker and Intel Parallel Studio? Or can they be used in a good combination somehow?A. Yes. Moreover, Parallel Studio is built on the latest technology (PIN) for faster analysis. Also, Parallel Inspector includes memory checking in addition to "Thread Checking". Parallel Amplifier has Statistical Call Graph for profiling your applications with low overhead to detect where time is spent in your application. See Intel Parallel Amplifier vs. Intel VTune Performance Analyzer Comparison.Detailed Q&A lists from each webinar:1. Go-Parallelism! Ease the Onramp for C/C++ Windows* Development - March 10 Solve Parallelism with Intel Parallel Studio - March 17 Simplify Parallelism with Intel Parallel Composer - March 24 Parallel Implementation Methods with Intel Parallel Composer - March 31 Debugging Parallel Code for Fast, Reliable Applications - April 7. Intel Parallel Inspector software free downloads. Intel Parallel Inspector shareware, freeware, demos: Intel Parallel Studio by softwareintelcom, Intel Parallel Studio XE by Intel, Paessler Site Inspector by Paessler AG etc

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Presentation on theme: "Correcting Threading Errors with Intel® Parallel Inspector."— Presentation transcript: 1 Correcting Threading Errors with Intel® Parallel Inspector 2 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 2 Intel® Parallel Inspector Objectives After successful completion of this module you will be able to… Use Parallel Inspector to detect and identify a variety of threading correctness issues in threaded applications Determine if library functions are thread-safe 3 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 3 Intel® Parallel Inspector Agenda What is Intel® Parallel Inspector? Detecting race conditions Detecting potential for deadlock Checking library thread-safety 4 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 4 Intel® Parallel Inspector Motivation Developing threaded applications can be a complex task New class of problems are caused by the interaction between concurrent threads Data races or storage conflicts More than one thread accesses memory without synchronization Deadlocks Thread waits for an event that will never happen 5 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 5 Intel® Parallel Inspector Debugging tool for threaded software Plug-in to Microsoft* Visual Studio* Finds threading bugs in OpenMP*, Intel® Threading Building Blocks, and Win32* threaded software Locates bugs quickly that can take days to find using traditional methods and tools Isolates problems, not the symptoms Bug does not have to occur to find it! 6 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. Intel® Parallel Inspector Features

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Integrated into Microsoft Visual Studio.NET* IDE 2005 & 2008 Editions Supports different compilers Microsoft* Visual* C++.NET* Intel Parallel Composer View (drill-down to) source code for Diagnostics One-click help for diagnostics Possible causes and solution suggestions 6 Intel® Parallel Inspector 7 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 7 Intel® Parallel Inspector Parallel Inspector: Analysis Dynamic as software runs Data (workload) -driven execution Includes monitoring of: Thread and Sync APIs used Thread execution order Scheduler impacts results Memory accesses between threads Code path must be executed to be analyzed 8 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 8 Intel® Parallel Inspector Parallel Inspector: Before You Start Instrumentation: background Adds calls to library to record information Thread and Sync APIs Memory accesses Increases execution time and size Use small data sets (workloads) Execution time and space is expanded Multiple runs over different paths yield best results Workload selection is important! 9 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 9 Intel® Parallel Inspector Workload Guidelines Execute problem code once per thread to be identified Use smallest possible working data set Minimize data set size Smaller image sizes Minimize loop iterations or time steps Simulate minutes rather than days Minimize update rates Lower frames per second Finds threading errors faster! 10 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 10 Intel® Parallel Inspector Building for Parallel Inspector Compile Use dynamically linked thread-safe runtime libraries ( /MDd ) Generate symbolic information ( /ZI ) Disable optimization ( /Od ) Link Preserve symbolic information ( /DEBUG ) Specify relocatable code sections ( /FIXED:NO ) 11 Copyright ©

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Value computed is used outside parallel region Shared value is required by each thread How to implement Mutual exclusion and synchronization Lock, semaphore, event, critical section, atomic… Rule of thumb: Use one lock per data element 22 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 22 Intel® Parallel Inspector Activity 1b - Potential Energy Fix errors found by Parallel Inspector 23 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 23 Intel® Parallel Inspector Deadlock Caused by thread waiting on some event that will never happen Most common cause is locking hierarchies Always lock and un-lock in the same order Avoid hierarchies if possible DWORD WINAPI threadA(LPVOID arg) { EnterCriticalSection(&L1); EnterCriticalSection(&L2); processA(data1, data2); LeaveCriticalSection(&L2); LeaveCriticalSection(&L1); return(0); } DWORD WINAPI threadB(LPVOID arg) { EnterCriticalSection(&L2); EnterCriticalSection(&L2); EnterCriticalSection(&L1); EnterCriticalSection(&L1); processB(data2, data1) ; processB(data2, data1) ; LeaveCriticalSection(&L1); LeaveCriticalSection(&L1);LeaveCriticalSection(&L2); return(0); return(0);} ThreadA: L1, then L2 ThreadB: L2, then L1 24 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 24 Intel® Parallel Inspector Deadlock Add lock per element Lock only elements, not whole array of elements void swap (shape_t A, shape_t B) { lock(a.mutex); lock(b.mutex); // Swap data between A & B unlock(b.mutex); unlock(a.mutex); } typedef struct { // some data things SomeLockType mutex; } shape_t; shape_t Q[1024]; swap(Q[986], Q[34]); Thread 4 swap(Q[34], Q[986]); Thread 1 Grabs mutex 34 Grabs mutex 986 25 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 25 Intel® Parallel Inspector Windows* Critical Section Lightweight, intra-process only mutex Most useful and most used New type CRITICAL_SECTION cs; Create and destroy operations InitializeCriticalSection(&cs) DeleteCriticalSection(&cs); 26 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo

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Are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 26 Intel® Parallel Inspector Windows* Critical Section CRITICAL_SECTION cs ; Attempt to enter protected code EnterCriticalSection(&cs) Blocks if another thread is in critical section Returns when no thread is in critical section Upon exit of critical section LeaveCriticalSection(&cs) Must be from obtaining thread 27 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 27 Intel® Parallel Inspector Example: Critical Section #define NUMTHREADS 4 CRITICAL_SECTION g_cs; // why does this have to be global? int g_sum = 0; DWORD WINAPI threadFunc(LPVOID arg ) { int mySum = bigComputation(); EnterCriticalSection(&g_cs); g_sum += mySum; // threads access one at a time LeaveCriticalSection(&g_cs); return 0; } main() { HANDLE hThread[NUMTHREADS]; InitializeCriticalSection(&g_cs); for (int i = 0; i 28 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 28 Intel® Parallel Inspector Activity 2 - Deadlock Use Intel® Parallel Inspector to find and correct the potential deadlock problem. 29 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 29 Intel® Parallel Inspector Thread Safe Routines All routines called concurrently from multiple threads must be thread safe How to test for thread safety? Use OpenMP and Parallel Inspector for analysis Use sections to create concurrent execution 30 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 30 Intel® Parallel Inspector Thread Safety Example Check for safety issues between Multiple instances of routine1() Instances of routine1() and routine2() Set up sections to test all permutations Still need to provide data sets that exercise relevant portions of. Intel Parallel Inspector software free downloads. Intel Parallel Inspector shareware, freeware, demos: Intel Parallel Studio by softwareintelcom, Intel Parallel Studio XE by Intel, Paessler Site Inspector by Paessler AG etc Intel Parallel Inspector （ 英语 ： Intel Parallel Inspector ） Intel VTune Amplifier

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Code #pragma omp parallel sections { #pragma omp section routine1(&data1); #pragma omp section routine1(&data2); #pragma omp section routine2(&data3); } 31 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 31 Intel® Parallel Inspector It is better to make a routine reentrant than to add synchronization Avoids potential overhead Two Ways to Ensure Thread Safety Routines can be written to be reentrant Any variables changed by the routine must be local to each invocation Don’t modify globally shared variables Routines can use mutual exclusion to avoid conflicts with other threads If accessing shared variables cannot be avoided What if third-party libraries are not thread safe? Will likely need to control threads access to library 32 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 32 Intel® Parallel Inspector Activity 3 – Thread Safety Use OpenMP framework to call library routines concurrently Three library calls = 6 combinations to test A:A, B:B, C:C, A:B, A:C, B:C 33 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 33 Intel® Parallel Inspector Intel® Parallel Inspector What’s Been Covered Threading errors are easy to introduce Debugging these errors by traditional techniques is hard Intel® Parallel Inspector catches these errors Errors do not have to occur to be detected Greatly reduces debugging time Improves robustness of the application 34 Copyright © 2006, Intel Corporation. All rights reserved. Intel and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries. *Other brands and names are the property of their respective owners. 34 Intel® Parallel Inspector

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Connection with saved sets capabilities.Register on LambdaTest to carry out Appium testing. Try LambdaTest Now!ConclusionThe job of Appium Desktop is to provide the user with a high-end environment to manage automated web, native, and hybrid app testing. This is to shield the user from anomalies, bugs, and other issues sabotaging the user experience. Every Appium test can be run on different real mobile devices since app monitoring under real user conditions can lead to results with 100% accuracy.Mobile app testing platforms like LambdaTest let you run Appium testing for mobile apps with less fizzy processes. Get the benefit of Cloud support on real devices when you access this platform. Your testing and quality assurance team can access many devices to manage online from a single Appium-ready platform. With built-in Appium support, your team can start leveraging Appium to automate testing.Mobile testers needn’t manually download Appium inspector to write and run Appium tests, be it parallel tests or simple tests. With cloud support, teams can find it easier to work than setting up Appium Desktop on-site with no need to expect any help or support from Appium experts often or just to figure out how to use Appium Inspector.Frequently Asked Questions (FAQs)What is Appium inspector?Appium inspector conducts Appium inspection, a standard procedure to identify the unique UI elements of any mobile app. It can support Android emulators, iOS simulators, and real devices.How to use Appium Inspector?The first step is to download and install Appium Inspector. It consists of Windows and OS X versions (.exe and .app). While opening the app, the Appium server will get started with the default IP address set to 0.0.Can Appium Inspector run on Windows?Yes, it can run as a desktop app for macOS, Windows, and Linux.​​ Amrita Angappa Amrita is an Ex employee at LambdaTest. She loves to explore the latest trends in emerging technologies, and deep dive into tech research. Travel, Food, Books…These are the nectars of her life. She is a staunch bibliophile lost somewhere in the world of muggles.. Intel Parallel Inspector software free downloads. Intel Parallel Inspector shareware, freeware, demos: Intel Parallel Studio by softwareintelcom, Intel Parallel Studio XE by Intel, Paessler Site Inspector by Paessler AG etc

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Hi All,I have on DLL called MyDll.dll which is used by outlook.exe. I have integrated Intel Inspector 2019 with Visual Studio 2015. But when I run memory analysis, it doesn't show anything.What Project setting I have to include. As of now it's as belowOn Target Tab:Application : C:\Program Files\Microsoft Office\Office16\OUTLOOK.EXEApplication Parameter: Working Directory : C:\wrk\MyDLL\vcprojWhat's there missing or how to do setting for it to run? CC++DebuggingDevelopment ToolsFortranIntel® InspectorOptimizationParallel ComputingVectorization すべてのフォーラムトピック 前のトピック 次のトピック 7 返答（返信） Hi Mahesh,Your target settings look good to me. Which language and runtime do you use to build your module (C++/C#)? Maybe you need to check if “Microsoft* runtime environment” option is set to appropriate mode.Take a look at ‘Collection Log’ messages and see which modules are loaded during analysis and which instrumentation mode is enabled for them. That could also give some clue what is going on there. Hi Michael Tutin (Intel),I am using C++. Visual Studio 2015. I have integrated Intel Inspector in VS 2015.The scenario is, I have three four DLLs. Which gets attached to Outlook.exe. So my whole code is for DLL in C++.When I run my application from Visual Studio 2015, I give outlook.exe as command path and then it launches outlook. That's how it runs normally.Now how to do same in Intel Inspector? I am unable to do it. When i run Threading Error Analysis from Intel inspector, it doesn't launch outlook.exe as it is expected and because of that it's now giving any analysis. By default, Inspector inherits settings of VS Project. You may open Inspector project settings window and uncheck that box to try to specify application to launch manually. To open this dialog, click on dropdown icon on VS toolbar and choose “Project Properties…” item. The same dialog can be opened by right clicking on VS Project in Solution Explorer. There will be “Inspector > Project Properties…” menu item.Another option would be to use Standalone Inspector GUI (inspxe-gui.exe) to run analysis. It has the same functionality except debugger integration. In the standalone client create new project and specify Outlook application as application to run.If it doesn’t help, could you compress and attach result directory created by Inspector? I’m quite not sure which step causes a problem. Hi Michael Tutin (Intel)I am still unable to execute it.Can you please tell me the exact project configuration for running analysis for below scenario.1. My application is DLLs, which are plugins to outlook.exe, which gets attached to OutlookAlso see the attached file for my project settings for your reference.Most important is, it doesn't load the symbol or doesn't detect the code. Hi Mahesh,Your project configuration is correct. Just click "Start" button and see if your plugin modules are loaded into the process. There is minor issue with inexistent directory to source files, but it should not affect analysis.What happens when you start analysis? Do you get any result? Hi Mahesh,Did Michael's recommendation help you to solve the issue?If yes, I would mark this forum topic as solved and close the related