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<a name="Partition-Attribute-Allow_005fLight_005fPCS"></a>
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Next: <a href="Pragma-Priority.html#Pragma-Priority" accesskey="n" rel="next">Pragma Priority</a>, Previous: <a href="Partition-Attribute-Data_005fLocation.html#Partition-Attribute-Data_005fLocation" accesskey="p" rel="prev">Partition Attribute Data_Location</a>, Up: <a href="The-Configuration-Language.html#The-Configuration-Language" accesskey="u" rel="up">The Configuration Language</a> &nbsp; [<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="Partition-Attribute-Allow_005fLight_005fPCS-1"></a>
<h4 class="subsubsection">8.5.4.14 Partition Attribute Allow_Light_PCS</h4>

<p>On some circumstances, <tt>po_gnatdist</tt> can detect that a partition does not need
the full PCS functionalities. This occurs in particular when the
partition does use any task, any RCI unit or any RACW object. Therefore,
the partition does not receive any message that is not a reply to a
previous request. In this case, the PCS does not drag in the tasking
library and a light PCS is linked in the partition executable.
This specific configuration is automatically determined by
<tt>po_gnatdist</tt> with the ALI file information.
</p>
<p>This optimization can be inappropriate especially when the user wants to
use the &quot;Distributed Shared Memory&quot; storage support which runs Li and
Hudak&rsquo;s algorithm. In this case, messages are exchanged without being
replies to previously sent requests and the normal PCS should be linked
instead of the light one. Note also that <tt>po_gnatdist</tt> cannot know for sure
that the DSM storage support assigned at configuration time is used at
run-time. The user can configure this optimization with the following
attribute.
</p>
<div class="smallexample">
<pre class="smallexample">

REPRESENTATION_CLAUSE ::=
   <b>for</b> PARTITION_IDENTIFIER'Allow_Light_PCS <b>use</b> BOOLEAN_LITERAL;

</pre></div>




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