Free Ebook Parallel Programming in OpenMP
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Parallel Programming in OpenMP
Free Ebook Parallel Programming in OpenMP
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Amazon.com Review
The OpenMP standard allows programmers to take advantage of new shared-memory multiprocessor systems from vendors like Compaq, Sun, HP, and SGI. Aimed at the working researcher or scientific C/C++ or Fortran programmer, Parallel Programming in OpenMP both explains what this standard is and how to use it to create software that takes full advantage of parallel computing. At its heart, OpenMP is remarkably simple. By adding a handful of compiler directives (or pragmas) in Fortran or C/C++, plus a few optional library calls, programmers can "parallelize" existing software without completely rewriting it. This book starts with simple examples of how to parallelize "loops"--iterative code that in scientific software might work with very large arrays. Sample code relies primarily on Fortran (undoubtedly the language of choice for high-end numerical software) with descriptions of the equivalent calls and strategies in C/C++. Each sample is thoroughly explained, and though the style in this book is occasionally dense, it does manage to give plenty of practical advice on how to make code run in parallel efficiently. The techniques explored include how to tweak the default parallelized directives for specific situations, how to use parallel regions (beyond simple loops), and the dos and don'ts of effective synchronization (with critical sections and barriers). The book finishes up with some excellent advice for how to cooperate with the cache mechanisms of today's OpenMP-compliant systems. Overall, Parallel Programming in OpenMP introduces the competent research programmer to a new vocabulary of idioms and techniques for parallelizing software using OpenMP. Of course, this standard will continue to be used primarily for academic or research computing, but now that OpenMP machines by major commercial vendors are available, even business users can benefit from this technology--for high-end forecasting and modeling, for instance. This book fills a useful niche by describing this powerful new development in parallel computing. --Richard Dragan Topics covered: Overview of the OpenMP programming standard for shared-memory multiprocessors Description of OpenMP parallel hardware OpenMP directives for Fortran and pragmas for C/C++ Parallelizing simple loops parallel do / parallel for directives Shared and private scoping for thread variables reduction operations Data dependencies and how to remove them OpenMP performance issues (sufficient work, balancing the load in loops, scheduling options) Parallel regions How to parallelize arbitrary blocks of code (master and slave threads, threadprivate directives and the copyin clause) Parallel task queues Dividing work based on thread numbers Noniterative work sharing Restrictions on work-sharing Orphaning Nested parallel regions Controlling parallelism in OpenMP, including controlling the number of threads, dynamic threads, and OpenMP library calls for threads OpenMP synchronization Avoiding data races Critical section directives (named and nested critical sections and the atomic directive Runtime OpenMP library lock routines Event synchronization (barrier directives and ordered sections) Custom synchronization, including the flush directive Programming tips for synchronization Performance issues with OpenMP Amdahl's Law Load balancing for parallelized code Hints for writing parallelized code that fits into processor caches Avoiding false sharing Synchronization hints Performance issues for bus-based and Non-Uniform Memory Access (NUMA) machines OpenMP quick reference
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Review
"This book will provide a valuable resource for the OpenMP community."—Timothy G. Mattson, Intel Corporation"This book has an important role to play in the HPC community-both for introducing practicing professionals to OpenMP and for educating students and professionals about parallel programming. I'm happy to see that the authors have put together such a complete OpenMP presentation."—Mary E. Zozel, Lawrence Livermore National Laboratory
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Product details
Paperback: 231 pages
Publisher: Morgan Kaufmann; 1 edition (October 16, 2000)
Language: English
ISBN-10: 1558606718
ISBN-13: 978-1558606715
Product Dimensions:
7.3 x 0.6 x 9.3 inches
Shipping Weight: 14.9 ounces (View shipping rates and policies)
Average Customer Review:
4.4 out of 5 stars
6 customer reviews
Amazon Best Sellers Rank:
#1,169,776 in Books (See Top 100 in Books)
I found this book to be a well written ground up how to on OpenMP. It is approachable by someone not well versed in parallel programming. I believe it was written before the wide scale advent of multi core architectures and in those pre multi core days most users of OpenMP would have been in the scientific community and have been interested largely in speeding up fortran codes. So the focus on the fortran constructs is understandable. However in todays world with every desktop equipped with a multi core cpu the book would be better with a stronger focus on c++. Despite the heavy focus on fortran examples the book does include information on using OpenMP from c++. I rate the book highly, because of its clarity, approachability, and style and hope future editions have a stronger showing of c++ examples.
Hoping for just information on OpenMP, I was pleased to find much information about issues with parallelizing algorithms. In fact, OpenMP itself is actually very tiny, easily fitting on a few quick reference cards. Applying OpenMP, or any multithreading for that matter, is what actually determines success. I was particularly pleased with the section on cache lines and their impact on design.
This book has many examples of how to parallelize Fortran 77 programs with loops using OpenMP directives, but coverage of how to parallelize Fortran 95 code using array operations is sparse. For this, one should read the tutorial "Parallel Programming in Fortran 95 using OpenMP", by Miguel Hermanns, available at the OpenMP web site.
I know some text books about this subject but this text resume the most important aspects about parallel programming in openmp.
Chandra et al. have put together a readable, helpful introduction to parallel programming with OpenMP. Unlike its major competitor, MPI, OpenMP assumes a shared memory model, in which every processor has the same view of the same address space as every other. At least as a start, this cuts the intellectual load way down. The programmer adds just one concept to the problem, parallelism, without adding buffering, communication networks, and lots of other stuff as well.After two introductory chapters, the authors introduce OpenMP in three stages: loop parallelism, general parallelism, and synchronization, roughly in order of increasing complexity. The authors present the necessary OpenMP pragmas and APIs at each step, showing how they address the immediate problems. An appendix summarizes the pragmas and APIs, in both their C/C++ and Fortran forms. OO C++ programmers may be dismayed by the amount of attention paid to an un-cool language like Fortran, but need to realize that it's still the lingua franca of performance programming. And, in fairness, the authors spend equal time on C++ idiosyncrasies, such as constructor invocations for variables that are silently replicated in each of the parallel threads.If you've ever done performance programming, you're groaningly aware that getting the parallelism right is actually the easy part. The tricky parts come in breaking dependencies, in scheduling, in ensuring spatial and temporal locality, and in dealing with cache coherency issues of multiprocessors. The authors give great introductions to all of the basics. This includes a patient description of how caches actually work, since there's a new crop of beginners every day. The authors describe performance analysis tools, but only briefly. The tools differ so much between vendors and between one rev and the next, that any detailed description would be useless to most readers immediately and obsolete for all readers very soon.This won't turn a beginner into the guru of performance computing. It will, however, establish a working competence in one popular parallelization tool, OpenMP, and in the computing technologies that affect parallel performance.//wiredweird
this is probably the first book about OMP. The author has decribed the uses of many functions and directives of OMP. The examples (in Fortran and C) given are also useful. Generally this is a good book to get you started off with OMP.
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