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<h1><a class="anchor" name="group">The Group Library </a></h1>The group library provides three mechanisms for parallel execution and communication.<p>
These are:<p>
<ul>
<li>
<a class="el" href="group.html#messagepassing">Message Passing</a> </li>
<li>
<a class="el" href="group.html#distmemory">Distributed Shared Memory</a> </li>
<li>
<a class="el" href="group.html#multithreading">Multi-Threading</a> </li>
</ul>
<h2><a class="anchor" name="messagepassing">
Message Passing</a></h2>
The MessageGrp class is the ancestor for classes that provide the passing of messages between processes. There are three important specializations of this class:<p>
<dl>
<dt>ProcMessageGrp</dt>
<dd>Provides a dummy MessageGrp for single processor case.<p>
</dd>
<dt>MPIMessageGrp</dt>
<dd>Implements MessageGrp using the Message Passing Interface (MPI) library.<p>
</dd>
<dt>ShmMessageGrp</dt>
<dd>Implements MessageGrp using SysV Interprocess communication.<p>
</dd>
</dl>
<p>
Due to the widespread acceptance of MPI and the large number of features that it supports, the MessageGrp specialization may one day be eliminated.<h2><a class="anchor" name="distmemory">
Distributed Shared Memory</a></h2>
The MemoryGrp class is the ancestor for classes that permit access to the memory in different processes, possible on difference machines. There are two important specializations of this class:<p>
<dl>
<dt>ProcMemoryGrp</dt>
<dd>Provides a dummy MemoryGrp for single processor case.<p>
</dd>
<dt>MTMPIMemoryGrp</dt>
<dd>This works reliably and efficiently, however, requires POSIX threads and a thread-safe MPI implementation.<p>
</dd>
<dt>ARMCIMemoryGrp</dt>
<dd>This message group uses the Aggregate Remote Copy Interface (ARMCI). This exploits the RDMA capabilities of interconnects such as Myrinet and InfiniBand.<p>
</dd>
</dl>
<h2><a class="anchor" name="multithreading">
Multi-Threading</a></h2>
The ThreadGrp class is the ancestor of classes that provide multiple-threads within a single address space. There are two important specializations of this class:<p>
<dl>
<dt>ProcThreadGrp</dt>
<dd>Provides a dummy ThreadGrp for the single thread case.<p>
</dd>
<dt>PthreadThreadGrp</dt>
<dd>This is a ThreadGrp that uses POSIX threads.<p>
</dd>
</dl>
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Mandriva
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2010.0
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i586
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media
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contrib-release
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by-pkgid
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files
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1128
