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Timing tests for a threadpool : single thread vs callback tp vs future tp

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History Beginners Guide to Threading in .NET: Part 4 of n ... #133 windows - Spurious timing test failures on windows #134 VS 2017.4 Preview deadlock in sync_pq_multi_thread_p_lib.exe #135 VS 2017.4 Preview test_scheduled_tp_p.exe deadlock #136 VS 2017.4 Preview test_scheduler_p.exe deadlock #137 VS 2017.4 Preview executor_ex.exe deadlock #143 Failures on msvc-12.0

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Past these values the TP seems to be less willing to schedule new threads, and there is some delay between request to std::async and actual thread creation. When launching the first eager task the system preallocates ~8 thread so that it is ready for new potential tasks. Timer Class (System.Timers) A component we needed as part of our minimal test harness was some ability to capture command line output from multiple subprocesses in parallel. There's a useful program we can build out of that without having test discovery working yet, just a little helper to run a command against every file in tree(s) in parallel, protected by NT Jobs. This helps flush out bugs in the scheduling machinery ... ConfigureAwait FAQ Coroutines with async and await syntax Specifying the threadpool in a configuration file means that the threadpool for the accompanying program can be tuned during testing and deployment, instead of hard-coded by the original programmer. Parallelize enforcement of clang An object with an __await__ method, or a C object with tp_as_async->am_await function, returning an iterator. Can be consumed by an await expression in a coroutine. A coroutine waiting for a Future-like object is suspended until the Future-like object's __await__ completes, and returns the result. .NET added async/await to the languages and libraries over seven years ago. In that time, it’s caught on like wildfire, not only across the .NET ecosystem, but also being replicated in a myriad of other languages and frameworks. It’s also seen a ton of improvements in .NET,

More advanced concurrency and asynchrony with C++/WinRT ...

CppCoreGuidelines/CppCoreGuidelines.md at master The async and await keywords have been a part of C# language since version 5.0, which was released in autumn 2013 as part of Visual Studio 2013. Although in essence they make asynchronous programming simpler, one can still use them incorrectly. Top 10 Easy Performance Optimisations in Java Parallelism eats up your cores. This is great for batch processing, but a nightmare for asynchronous servers (such as HTTP). There are good reasons why we’ve used the single-thread servlet model in the past decades. So parallelism only helps when scaling up. Parallelism has no effect on your algorithm’s Big O Notation. The method executes when a thread pool thread becomes available. RegisterWaitForSingleObject: Overloaded. Registers a delegate that is waiting for a WaitHandle. SetMaxThreads: Sets the number of requests to the thread pool that can be active concurrently. All requests above that number remain queued until the thread pool threads become available. When used as a parameter TP&& is safe because any temporary objects passed from the caller will live for the duration of the function call. A parameter of type TP&& should essentially always be passed onward via std::forward in the body of the function. Example template

Timing tests for a threadpool : single thread vs callback ...

2 Timing tests for a threadpool : single thread vs callback tp vs future tp May 9 '17 1 Java Streams checking for nulls Jan 29 '16 1 Optional IfPresent and alternative else Feb 4 '16 That returns control to the caller, and then immediately resumes execution on a thread pool thread. The thread pool being used in the implementation is the low-level Windows thread pool, so it's optimially efficient. IAsyncOperation DoWorkOnThreadPoolAsync() { co_await winrt::resume_background(); // Return control; resume on thread pool. Stack Overflow ComVisible(true)] public delegate void WaitOrTimerCallback (Object state, bool timedOut); // signalled or timed out // // This type is necessary because VS 2010's debugger looks for a method named _ThreadPoolWaitCallbacck.PerformWaitCallback // on the stack to determine if a thread is a ThreadPool thread … mono/threadpool.cs at master · mono/mono · GitHub // on the stack to determine if a thread is a ThreadPool thread or not. We have a better way to do this for .NET 4.5, but // still need to maintain compatibility with VS 2010. When compat with VS 2010 is no longer an issue, this type may be // removed. // internal static class _ThreadPoolWaitCallback {# if FEATURE_INTERCEPTABLE_THREADPOOL_CALLBACK More advanced concurrency and asynchrony with C++/WinRT ... referencesource.microsoft.com I am running on a 4 CPU machine. I am getting timing results that shows that the single thread is fastest , and the one returning the future the slowest. 4-sized-TP with Future Time taken = 2.364ms. 4-sized-TP-Callback Time taken = 1.103ms. In Sequence Time taken = 0.026ms. I …