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167 lines
6.6 KiB
167 lines
6.6 KiB
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<h1 class="topictitle1">Intel® Threading Building Blocks Benefits</h1>
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<div>
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<p> Intel® Threading Building Blocks (Intel® TBB) is a library that helps
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you leverage multi-core performance without having to be a threading expert.
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Typically you can improve performance for multi-core processors by implementing
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the key points explained in the early sections of the User Guide. As your
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expertise grows, you may want to dive into more complex subjects that are
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covered in advanced sections.
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</p>
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<p>There are a variety of approaches to parallel programming, ranging from
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using platform-dependent threading primitives to exotic new languages. The
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advantage of Intel® Threading Building Blocks is that it works at a higher
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level than raw threads, yet does not require exotic languages or compilers. You
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can use it with any compiler supporting ISO C++. The library differs from
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typical threading packages in the following ways:
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</p>
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<ul type="disc">
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<li>
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<p><strong>Intel® Threading Building Blocks enables you to specify
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<em>logical paralleism</em> instead of threads</strong>. Most threading
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packages require you to specify threads. Programming directly in terms of
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threads can be tedious and lead to inefficient programs, because threads are
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low-level, heavy constructs that are close to the hardware. Direct programming
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with threads forces you to efficiently map logical tasks onto threads. In
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contrast, the Intel® Threading Building Blocks run-time library automatically
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maps logical parallelism onto threads in a way that makes efficient use of
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processor resources.
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</p>
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</li>
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<li>
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<p><strong>Intel® Threading Building Blocks targets
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<em>threading for performance</em></strong>. Most general-purpose
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threading packages support many different kinds of threading, such as threading
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for asynchronous events in graphical user interfaces. As a result,
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general-purpose packages tend to be low-level tools that provide a foundation,
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not a solution. Instead, Intel® Threading Building Blocks focuses on the
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particular goal of parallelizing computationally intensive work, delivering
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higher-level, simpler solutions.
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</p>
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</li>
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<li>
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<p><strong>Intel® Threading Building Blocks is
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<em>compatible</em> with other threading packages.</strong> Because the
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library is not designed to address all threading problems, it can coexist
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seamlessly with other threading packages.
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</p>
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</li>
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<li>
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<p><strong>Intel® Threading Building Blocks emphasizes
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<em>scalable, data parallel programming</em></strong>. Breaking a program
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up into separate functional blocks, and assigning a separate thread to each
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block is a solution that typically does not scale well since typically the
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number of functional blocks is fixed. In contrast, Intel® Threading Building
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Blocks emphasizes
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<em>data-parallel</em> programming, enabling multiple threads to work
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on different parts of a collection. Data-parallel programming scales well to
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larger numbers of processors by dividing the collection into smaller pieces.
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With data-parallel programming, program performance increases as you add
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processors.
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</p>
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</li>
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<li>
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<p><strong>Intel® Threading Building Blocks relies on
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<em>generic programming</em></strong>. Traditional libraries specify
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interfaces in terms of specific types or base classes. Instead, Intel®
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Threading Building Blocks uses generic programming. The essence of generic
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programming is writing the best possible algorithms with the fewest
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constraints. The C++ Standard Template Library (STL) is a good example of
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generic programming in which the interfaces are specified by
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<em>requirements</em> on types. For example, C++ STL has a template
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function
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<samp class="codeph">sort</samp> that sorts a sequence abstractly defined in
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terms of iterators on the sequence. The requirements on the iterators are:
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</p>
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<ul type="disc">
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<li>
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<p>Provide random access
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</p>
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</li>
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<li>
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<p>The expression
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<samp class="codeph">*i<*j</samp> is true if the item pointed to by
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iterator
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<samp class="codeph">i</samp> should precede the item pointed to by iterator
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<samp class="codeph">j</samp>, and false otherwise.
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</p>
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</li>
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<li>
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<p>The expression
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<samp class="codeph">swap(*i,*j)</samp> swaps two elements.
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</p>
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</li>
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</ul>
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</li>
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</ul>
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<p>Specification in terms of requirements on types enables the template to
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sort many different representations of sequences, such as vectors and deques.
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Similarly, the Intel® Threading Building Blocks templates specify requirements
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on types, not particular types, and thus adapt to different data
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representations. Generic programming enables Intel® Threading Building Blocks
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to deliver high performance algorithms with broad applicability.
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</p>
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</div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="../main/title.htm">Intel® Threading Building Blocks Documentation</a></div>
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