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-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Design</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" C++ , library , parallel "/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="parallel_mode.html" title="Chapter 18. Parallel Mode"/><link rel="prev" href="bk01pt03ch18s03.html" title="Using"/><link rel="next" href="bk01pt03ch18s05.html" title="Testing"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Design</th></tr><tr><td align="left"><a accesskey="p" href="bk01pt03ch18s03.html">Prev</a> </td><th width="60%" align="center">Chapter 18. Parallel Mode</th><td align="right"> <a accesskey="n" href="bk01pt03ch18s05.html">Next</a></td></tr></table><hr/></div><div class="section" title="Design"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.parallel_mode.design"/>Design</h2></div></div></div><p>
- </p><div class="section" title="Interface Basics"><div class="titlepage"><div><div><h3 class="title"><a id="parallel_mode.design.intro"/>Interface Basics</h3></div></div></div><p>
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Design</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><meta name="keywords" content="
+ C++
+ ,
+ library
+ ,
+ parallel
+ "><meta name="keywords" content="
+ ISO C++
+ ,
+ library
+ "><meta name="keywords" content="
+ ISO C++
+ ,
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+ "><link rel="home" href="../index.html" title="The GNU C++ Library"><link rel="up" href="parallel_mode.html" title="Chapter 18. Parallel Mode"><link rel="prev" href="bk01pt03ch18s03.html" title="Using"><link rel="next" href="bk01pt03ch18s05.html" title="Testing"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Design</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk01pt03ch18s03.html">Prev</a> </td><th width="60%" align="center">Chapter 18. Parallel Mode</th><td width="20%" align="right"> <a accesskey="n" href="bk01pt03ch18s05.html">Next</a></td></tr></table><hr></div><div class="section" title="Design"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="manual.ext.parallel_mode.design"></a>Design</h2></div></div></div><p>
+ </p><div class="section" title="Interface Basics"><div class="titlepage"><div><div><h3 class="title"><a name="parallel_mode.design.intro"></a>Interface Basics</h3></div></div></div><p>
All parallel algorithms are intended to have signatures that are
equivalent to the ISO C++ algorithms replaced. For instance, the
<code class="function">std::adjacent_find</code> function is declared as:
compile-time or run-time conditions.
</p><p> The available signature options are specific for the different
algorithms/algorithm classes.</p><p> The general view of overloads for the parallel algorithms look like this:
-</p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p>ISO C++ signature</p></li><li class="listitem"><p>ISO C++ signature + sequential_tag argument</p></li><li class="listitem"><p>ISO C++ signature + algorithm-specific tag type
+</p><div class="itemizedlist"><ul class="itemizedlist"
type="disc"><li class="listitem"><p>ISO C++ signature</p></li><li class="listitem"><p>ISO C++ signature + sequential_tag argument</p></li><li class="listitem"><p>ISO C++ signature + algorithm-specific tag type
(several signatures)</p></li></ul></div><p> Please note that the implementation may use additional functions
(designated with the <code class="code">_switch</code> suffix) to dispatch from the
ISO C++ signature to the correct parallel version. Also, some of the
algorithms do not have support for run-time conditions, so the last
overload is therefore missing.
-</p></div><div class="section" title="Configuration and Tuning"><div class="titlepage"><div><div><h3 class="title"><a
id="parallel_mode.design.tuning"/>Configuration and Tuning</h3></div></div></div><div class="section" title="Setting up the OpenMP Environment"><div class="titlepage"><div><div><h4 class="title"><a id="parallel_mode.design.tuning.omp"/>Setting up the OpenMP Environment</h4></div></div></div><p>
+</p></div><div class="section" title="Configuration and Tuning"><div class="titlepage"><div><div><h3 class="title"><a
name="parallel_mode.design.tuning"></a>Configuration and Tuning</h3></div></div></div><div class="section" title="Setting up the OpenMP Environment"><div class="titlepage"><div><div><h4 class="title"><a name="parallel_mode.design.tuning.omp"></a>Setting up the OpenMP Environment</h4></div></div></div><p>
Several aspects of the overall runtime environment can be manipulated
by standard OpenMP function calls.
</p><p>
nested parallelism (<code class="function">omp_set_nested</code>), schedule kind
(<code class="function">omp_set_schedule</code>), and others. See the OpenMP
documentation for more information.
-</p></div><div class="section" title="Compile Time Switches"><div class="titlepage"><div><div><h4 class="title"><a
id="parallel_mode.design.tuning.compile"/>Compile Time Switches</h4></div></div></div><p>
+</p></div><div class="section" title="Compile Time Switches"><div class="titlepage"><div><div><h4 class="title"><a
name="parallel_mode.design.tuning.compile"></a>Compile Time Switches</h4></div></div></div><p>
To force an algorithm to execute sequentially, even though parallelism
is switched on in general via the macro <code class="constant">_GLIBCXX_PARALLEL</code>,
add <code class="classname">__gnu_parallel::sequential_tag()</code> to the end
<code class="code">__gnu_parallel::balanced_quicksort_tag</code>.
Multiway mergesort comes with the two splitting strategies for multi-way
merging. The quicksort options cannot be used for <code class="code">stable_sort</code>.
-</p></div><div class="section" title="Run Time Settings and Defaults"><div class="titlepage"><div><div><h4 class="title"><a
id="parallel_mode.design.tuning.settings"/>Run Time Settings and Defaults</h4></div></div></div><p>
+</p></div><div class="section" title="Run Time Settings and Defaults"><div class="titlepage"><div><div><h4 class="title"><a
name="parallel_mode.design.tuning.settings"></a>Run Time Settings and Defaults</h4></div></div></div><p>
The default parallelization strategy, the choice of specific algorithm
strategy, the minimum threshold limits for individual parallel
algorithms, and aspects of the underlying hardware can be specified as
<code class="code">__gnu_parallel::_Settings::set</code>, respectively.
Please note that the first call return a const object, so direct manipulation
is forbidden.
-See <a class="link" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01005.html">
+See <a class="link" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01005.html" target="_top">
<code class="filename">settings.h</code></a>
for complete details.
</p><p>
return 0;
}
-</pre></div></div><div class="section" title="Implementation Namespaces"><div class="titlepage"><div><div><h3 class="title"><a
id="parallel_mode.design.impl"/>Implementation Namespaces</h3></div></div></div><p> One namespace contain versions of code that are always
+</pre></div></div><div class="section" title="Implementation Namespaces"><div class="titlepage"><div><div><h3 class="title"><a
name="parallel_mode.design.impl"></a>Implementation Namespaces</h3></div></div></div><p> One namespace contain versions of code that are always
explicitly sequential:
<code class="code">__gnu_serial</code>.
</p><p> Two namespaces contain the parallel mode:
</p><p> More information, and an organized index of types and functions
related to the parallel mode on a per-namespace basis, can be found in
the generated source documentation.
-</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="bk01pt03ch18s03.html">Prev</a> </td><td align="center"><a accesskey="u" href="parallel_mode.html">Up</a></td><td align="right"> <a accesskey="n" href="bk01pt03ch18s05.html">Next</a></td></tr><tr><td align="left" valign="top">Using </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Testing</td></tr></table></div></body></html>
+</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt03ch18s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="parallel_mode.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt03ch18s05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Using </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Testing</td></tr></table></div></body></html>
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