Read e-book online Intel® Xeon Phi™ Coprocessor Architecture and Tools: The PDF

By Rezaur Rahman

ISBN-10: 1430259264

ISBN-13: 9781430259268

ISBN-10: 1430259272

ISBN-13: 9781430259275

Intel® Xeon Phi™ Coprocessor structure and instruments: The advisor for program Developers presents builders a finished creation and in-depth examine the Intel Xeon Phi coprocessor structure and the corresponding parallel info constitution instruments and algorithms utilized in a few of the technical computing functions for which it really is compatible. It additionally examines the resource code-level optimizations that may be played to use the strong good points of the processor.

Xeon Phi is on the middle of world's quickest advertisement supercomputer, which due to the hugely parallel computing features of Intel Xeon Phi processors coupled with Xeon Phi coprocessors attained 33.86 teraflops of benchmark functionality in 2013. Extracting such stellar functionality in real-world purposes calls for a worldly knowing of the complicated interplay between elements, Xeon Phi cores, and the purposes operating on them.

during this e-book, Rezaur Rahman, an Intel chief within the improvement of the Xeon Phi coprocessor and the optimization of its functions, provides and info the entire good points of Xeon Phi center layout which are proper to the perform of software builders, corresponding to its vector devices, multithreading, cache hierarchy, and host-to-coprocessor conversation channels. construction in this starting place, he exhibits builders find out how to remedy real-world technical computing difficulties by way of identifying, deploying, and optimizing the to be had algorithms and knowledge constitution choices matching Xeon Phi's features. From Rahman's sensible descriptions and large code examples, the reader will achieve a operating wisdom of the Xeon Phi vector guideline set and the Xeon Phi microarchitecture wherein cores execute 512-bit guideline streams in parallel.

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Additional info for Intel® Xeon Phi™ Coprocessor Architecture and Tools: The Guide for Application Developers

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0 specifications also provide routines to set and get runtime environment settings (referred to as ICVs in the OpenMP specs) and to query the number of available coprocessors using the following APIs: void omp_set_default_device(int device_num), int omp_get_default_device(); 27 Chapter 2 ■ Programming Xeon Phi Description: Set default device for offload. This gets or sets the ICV default-device-var. The corresponding environment variable is OMP_DEFAULT_DEVICE. int omp_get_num_devices(); Description: Query number of coprocessors in the system.

When an instruction in the DP pipeline is followed by a dependent instruction executing in an SP pipeline, the DP instruction has to complete the write before the dependent SP instruction can execute, because there are no bypasses between different pipelines. In this case the second instruction is stalled until the first instruction completes its write back, incurring a seven-cycle delay. Pairing Rule Although all vector instructions can execute on the U-pipe, some vector instructions can execute on the V-pipe as well.

C/C++ specific: A throw executed inside a target region must cause execution to resume within the same target region, and the same thread that threw the exception must catch it. The syntax for expressing data transfers between host and coprocessors is expressed by target data and update constructs, as discussed in the next section. Target Update Directive Target update directive synchronizes the list items in the device data environment consistent with their corresponding original list items according to the map clause.

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Intel® Xeon Phi™ Coprocessor Architecture and Tools: The Guide for Application Developers by Rezaur Rahman


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