Download Parallel Programming with Microsoft Visual C++: Design by Colin Campbell PDF

By Colin Campbell

Your CPU meter indicates an issue. One middle is operating at 100%, yet the entire different cores are idle. Your program is CPU-bound, yet you're utilizing just a fraction of the computing strength of your multicore process. Is there how to get well functionality? the reply, in a nutshell, is parallel programming. the place you as soon as could have written the type of sequential code that's everyday to all programmers, you presently locate that this now not meets your functionality targets. to take advantage of your system's CPU assets successfully, you want to cut up your program into items that may run whilst.

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Small Loop Bodies with Few Iterations You probably won’t get performance improvements if you use a parallel loop for very small loop bodies with only a limited number of data elements to process. In this case, the overhead required by the parallel loop itself will dominate the calculation. Simply changing every sequential for loop to parallel_for will not necessarily produce good results. Duplicates in the Input Enumeration If you’re using the parallel_for_each function, duplicate references or pointers to objects in the enumeration often indicate an unsafe race condition in your code.

You’ll see this variation of the Parallel Loop pattern in a variety of circumstances. Reducing the degree of parallelism is often done in performance testing to simulate less capable hardware. Increasing the degree of parallelism to a number larger than the number of cores can be appropriate when iterations of your loop spend a lot of time waiting for I/O operations to complete. The term degree of parallelism refers to the number of cores that are used to process iterations simultaneously. The degree of parallelism is automatically managed by the underlying components of the system.

Info pa r a llel tasks Long-running tasks can use the is_canceling method to poll their task group for its cancellation status and shut themselves down if cancellation has been requested. The is_canceling method might also be used if you need to perform local cleanup actions for a task that’s in the process of being canceled. When the task group returns from a call to its wait method, its state is reset and its is_canceling method thereafter returns false. Checking for cancellation within a loop that has many iterations that each performs a small amount of work can negatively affect your application’s performance.

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