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<h1 class="topictitle1">Parallelizing Simple Loops</h1>
<div>
<p>The simplest form of scalable parallelism is a loop of iterations that
can each run simultaneously without interfering with each other. The following
sections demonstrate how to parallelize simple loops.
</p>
<div class="Note"><h3 class="NoteTipHead">
Note</h3>
<p>Intel® Threading Building Blocks (Intel® TBB) components are defined
in namespace
<samp class="codeph">tbb</samp>. For brevity’s sake, the namespace is explicit in
the first mention of a component, but implicit afterwards.
</p>
</div>
<p>When compiling Intel® TBB programs, be sure to link in the Intel® TBB
shared library, otherwise undefined references will occur. The following table
shows compilation commands that use the debug version of the library. Remove
the "<samp class="codeph">_debug</samp>" portion to link against the production version of
the library. See
<samp class="codeph">doc/Getting_Started.pdf</samp> for other command line
possibilities.
</p>
<div class="tablenoborder"><a name="tbl8"><!-- --></a><table cellpadding="4" summary="" id="tbl8" width="100%" frame="border" border="1" cellspacing="0" rules="all"><caption><span class="tablecap">Sample command lines for simple debug builds</span></caption><thead align="left">
<tr>
<th class="cellrowborder" valign="top" width="50%" id="d148147e56">Operating System
</th>
<th class="cellrowborder" valign="top" width="50%" id="d148147e59">Command line
</th>
</tr>
</thead>
<tbody>
<tr>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e56 ">
<p>Windows* OS
</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e59 ">
<p>
<samp class="codeph">icl /MD example.cpp tbb_debug.lib
</samp>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e56 ">
<p>Linux* OS
</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e59 ">
<p>
<samp class="codeph">icc example.cpp -ltbb_debug</samp>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e56 ">
<p>OS X* Systems
</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="d148147e59 ">
<p>
<samp class="codeph">icc example.cpp -ltbb_debug</samp>
</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../tbb_userguide/title.htm">Intel® Threading Building Blocks (Intel® TBB) User Guide</a></div>
</div>
<div class="See Also">
<ul class="ullinks">
<li class="ulchildlink"><a href="../tbb_userguide/Initializing_and_Terminating_the_Library.htm">Initializing and Terminating the Library</a><br>
</li>
<li class="ulchildlink"><a href="../tbb_userguide/parallel_for.htm">parallel_for</a><br>
</li>
<li class="ulchildlink"><a href="../tbb_userguide/parallel_reduce.htm">parallel_reduce</a><br>
</li>
<li class="ulchildlink"><a href="../tbb_userguide/Advanced_Example.htm">Advanced Example</a><br>
</li>
<li class="ulchildlink"><a href="../tbb_userguide/Advanced_Topic_Other_Kinds_of_Iteration_Spaces.htm">Advanced Topic: Other Kinds of Iteration Spaces</a><br>
</li>
</ul>
<h2>See Also</h2>
<div class="linklist">
<div><a href="Debug_Versus_Release_Libraries.htm#tutorial_Debug_Versus_Release_Libraries">Debug Versus Release Libraries
</a></div>
<div><a href="Which_Dynamic_Libraries_to_Use.htm#tutorial_Which_Dynamic_Libraries_to_Use">Which Dynamic Libraries to Use
</a></div></div>
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