Home Programming • Download Seven Concurrency Models in Seven Weeks: When Threads by Paul Butcher PDF

Download Seven Concurrency Models in Seven Weeks: When Threads by Paul Butcher PDF

By Paul Butcher

Your software program must leverage a number of cores, deal with millions of clients and terabytes of information, and proceed operating within the face of either and software program failure. Concurrency and parallelism are the keys, and 7 Concurrency versions in Seven Weeks equips you for this new international. See how rising applied sciences similar to actors and sensible programming handle matters with conventional threads and locks improvement. how to make the most the parallelism on your computer's GPU and leverage clusters of machines with MapReduce and move Processing. And do all of it with the arrogance that comes from utilizing instruments that assist you write crystal transparent, fine quality code.

This e-book will enable you make the most assorted parallel architectures to enhance your code's functionality, scalability, and resilience. You'll find out about seven concurrency versions: threads and locks, useful programming, isolating id and kingdom, actors, sequential strategies, information parallelism, and the lambda architecture.

Learn concerning the perils of conventional threads and locks programming and the way to beat them via cautious layout and by way of operating with the normal library. See how actors permit software program operating on geographically allotted pcs to collaborate, deal with failure, and create platforms that not sleep 24/7/365. comprehend why shared mutable kingdom is the enemy of sturdy concurrent code, and notice how useful programming including applied sciences akin to software program Transactional reminiscence (STM) and automated parallelism assist you tame it.

You'll find out about the untapped strength inside of each GPU and the way GPGPU software program can unharness it. You'll see the right way to use MapReduce to harness great clusters to unravel formerly intractable difficulties, and the way, in live performance with move Processing, tremendous information may be tamed.

With an knowing of the strengths and weaknesses of every of the several types and architectures, you'll be empowered to take on any challenge with confidence.

What You Need:

The instance code could be compiled and accomplished on *nix, OS X, or home windows. directions on the right way to obtain the helping construct platforms are given in each one bankruptcy.

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Additional info for Seven Concurrency Models in Seven Weeks: When Threads Unravel

Example text

If, however, the condition is not true, it calls await(), which atomically unlocks the lock and blocks on the condition variable. An operation is atomic if, from the point of view of another thread, it appears to be a single operation that has either happened or not—it never appears to be halfway through. When another thread calls signal() or signalAll() to indicate that the condition might now be true, await() unblocks and automatically reacquires the lock. An important point is that when await() returns, it only indicates that the condition might be true.

Try modifying the length of time that philosophers think and eat and the number of philosophers. What effect does this have on how long it takes until deadlock? Imagine that you were trying to debug this and wanted to increase the likelihood of reproducing the deadlock—what would you do? report erratum • discuss Day 2: Beyond Intrinsic Locks • 21 • (Hard) Create a program that demonstrates writes to memory appearing to be reordered in the absence of synchronization. This is difficult because although the Java memory model allows things to be reordered, most simple examples won’t be optimized to the point of actually demonstrating the problem.

Instead of making a copy before iterating through the list, it makes a copy whenever it’s changed. Any existing iterators will continue to refer to the previous copy. This isn’t an approach that would be appropriate for many use cases, but it’s perfect for this one. First, as you can see, it results in very clear and concise code. In fact, apart from the definition of listeners, it’s identical to the naïve, non-thread-safe version we first came up with in the code on page 18. Second, it’s more efficient report erratum • discuss Day 3: On the Shoulders of Giants • 35 Joe asks: How Large Should My Thread Pool Be?

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