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<a name="Introduction-to-PolyORB_002fDSA"></a>
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Next: <a href="How-to-Configure-a-Distributed-Application.html#How-to-Configure-a-Distributed-Application" accesskey="n" rel="next">How to Configure a Distributed Application</a>, Previous: <a href="Building-a-DSA-application-with-PolyORB.html#Building-a-DSA-application-with-PolyORB" accesskey="p" rel="prev">Building a DSA application with PolyORB</a>, Up: <a href="Building-a-DSA-application-with-PolyORB.html#Building-a-DSA-application-with-PolyORB" accesskey="u" rel="up">Building a DSA application with PolyORB</a> [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<a name="Introduction-to-PolyORB_002fDSA-1"></a>
<h4 class="subsection">8.5.1 Introduction to PolyORB/DSA</h4>
<p>A distributed Ada application comprises a number of partitions
which can be executed concurrently on the same machine or, and this is
the interesting part, can be distributed on a network of machines.
The way in which partitions communicate is described in Annex E of the
Ada Reference Manual.
</p>
<p>A partition is a set of compilation units that are linked together to
produce an executable binary. A distributed program comprises two or
more communicating partitions.
</p>
<p>The Distributed Systems Annex (DSA) does not describe how a distributed
application should be configured. It is up to the user to define what
are the partitions in his program and on which machines they should be
executed.
</p>
<p>The tool <tt>po_gnatdist</tt> and its configuration language
allows the user to partition his program and to specify the
machines on which the individual partitions are to execute.
</p>
<p><tt>po_gnatdist</tt> reads a configuration file (whose syntax is described in
section <a href="The-Configuration-Language.html#The-Configuration-Language">The Configuration Language</a>) and builds several
executables, one for each partition. It also takes care of launching the
different partitions (default) with parameters that can be specific to
each partition.
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