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diff --git a/parallel-programming/PPChapter2.html b/parallel-programming/PPChapter2.html
diff --git a/parallel-programming/PPChapter3.html b/parallel-programming/PPChapter3.html
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+    <span class="nav-text">{Parallel Programming} Environment</span>
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+    <a class="nav-link" href="PPChapter1.html">CPU, GPU, GPGPU Architecture</a>
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+    <a class="nav-link" href="PPChapter2.html">Programming interface for parallel computing</a>
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+  <div class="content">
+<aside class="toc sidebar" data-title="Contents" data-levels="2">
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+</aside>
+<article class="doc">
+<div class="sect2">
+<h3 id="_3_star_pu"><a class="anchor" href="#_3_star_pu"></a>1. 3.Star PU</h3>
+<div class="paragraph">
+<p><strong>StarPU</strong> is a task scheduling library for hybrid architectures. StarPU&#8217;s
+goal is to design systems in which applications are distributed across
+the entire machine, powering parallel tasks to all available resources.
+It keeps track of the copies of each of the data in the various memories
+on board the accelerators, and provides mechanisms such as data
+preloading. The calculation time has been greatly reduced, as well as
+the high efficiency in the use of the different calculation resources,
+the different typical workloads, especially in the case of multi-core
+machines equipped with several acceleration machines.</p>
+</div>
+<div class="paragraph">
+<p>The app provides algorithms and constraints</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>CPU/GPU implementations of tasks</p>
+</li>
+<li>
+<p>A task graph, using either StarPU&#8217;s rich C/C++/Fortran/Python API or
+OpenMP pragmas.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>StarPU internally deals with the following aspects:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Task dependencies</p>
+</li>
+<li>
+<p>Optimized heterogeneous scheduling</p>
+</li>
+<li>
+<p>Optimized data transfers and replication between main memory and
+discrete memories</p>
+</li>
+<li>
+<p>Optimized cluster communications</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p><span class="image unresolved"><img src="../assests/images/image19.png" alt="image" width="179" height="179"></span></p>
+</div>
+<div class="paragraph">
+<p>Links:</p>
+</div>
+<div class="paragraph">
+<p><a href="https://hpc2n.github.io/Task-based-parallelism/branch/master/starpu1/#hello-world" class="bare">hpc2n.github.io/Task-based-parallelism/branch/master/starpu1/#hello-world</a></p>
+</div>
+<div class="paragraph">
+<p><a href="https://github.com/alucas/StarPU/tree/master" class="bare">github.com/alucas/StarPU/tree/master</a></p>
+</div>
+<div class="paragraph">
+<p><a href="https://hpc2n.github.io/Task-based-parallelism/branch/master/starpu1/#benefits-and-downsides" class="bare">hpc2n.github.io/Task-based-parallelism/branch/master/starpu1/#benefits-and-downsides</a></p>
+</div>
+<div class="paragraph">
+<p><a href="https://indico.math.cnrs.fr/event/6415/attachments/2736/3475/2021.02.24_-" class="bare">indico.math.cnrs.fr/event/6415/attachments/2736/3475/2021.02.24_-</a><em>exa2pro-eocoe_workshop</em>-<em>StarPU</em>-_S._Thibault.pdf</p>
+</div>
+<div class="paragraph">
+<p><a href="https://gitub.u-bordeaux.fr/starpu/starpu/-/tree/master/examples" class="bare">gitub.u-bordeaux.fr/starpu/starpu/-/tree/master/examples</a></p>
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+</div>
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