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copied!<p>Yes, this is the expected behavior.</p> <p>TBB is a library designed to parallelize code for PERFORMANCE. It is not designed for asynchronous tasks - the official documentation states that you should use another library, eg pthreads, for such tasks (or boost::thread, in your case).</p> <p>For maximum performance, it does not make any sense to have more threads than you do cores, as there are some significant overheads involved (not just context switching, but also things like flushing the cache).</p> <p>EDIT: You can read about it in the <a href="http://www.threadingbuildingblocks.org/uploads/81/91/Latest%20Open%20Source%20Documentation/Tutorial.pdf" rel="nofollow">Tutorial</a>. Specifically, in section 1.2 "Benefits" it states</p> <blockquote> <p>Intel® Threading Building Blocks targets threading for performance. Most general-purpose threading packages support many different kinds of threading, such as threading for asynchronous events in graphical user interfaces. As a result, general-purpose packages tend to be low-level tools that provide a foundation, not a solution. Instead, Intel® Threading Building Blocks focuses on the particular goal of parallelizing computationally intensive work, delivering higher-level, simpler solutions.</p> </blockquote> <p>and</p> <blockquote> <p>Intel® Threading Building Blocks is compatible with other threading packages. Because the library is not designed to address all threading problems, it can coexist seamlessly with other threading packages.</p> </blockquote>

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