<h4>2.1 <span class="Heading">Installation and system requirements</span></h4>
<p>Both <strong class="pkg">SCSCP</strong> client and server for <strong class="pkg">GAP</strong> work in Linux, OS X and Windows.</p>
<p>To use the <strong class="pkg">SCSCP</strong> package it is necessary to install recent versions of <strong class="pkg">GAP</strong>4 packages <strong class="pkg">IO</strong> <a href="chapBib.html#biBIO">[Neu]</a>, <strong class="pkg">GAPDoc</strong> <a href="chapBib.html#biBGAPDoc">[LN]</a> and <strong class="pkg">OpenMath</strong> <a href="chapBib.html#biBopenmath">[CKNS]</a>.</p>
<p>The <strong class="pkg">SCSCP</strong> package is distributed in standard formats (<code class="file">tar.gz</code>, <code class="file">tar.bz2</code>) and can be obtained from <span class="URL"><a href="https://gap-packages.github.io/scscp/">https://gap-packages.github.io/scscp/</a></span> or from the <strong class="pkg">GAP</strong> web site (the latter also offers <code class="file">win.zip</code>-archives). To install <strong class="pkg">SCSCP</strong> package, put its <code class="file">tar.gz</code>-archive into the <code class="file">pkg</code> subdirectory of your <strong class="pkg">GAP</strong>4 installation and enter the command <code class="code">tar -xzf scscp-X.X.X.tar.gz</code>, then the subdirectory <code class="file">scscp</code> (containing subdirectories <code class="file">doc</code>, <code class="file">lib</code> etc.) will be created in the <code class="file">pkg</code> subdirectory. Installation using other archive formats is performed in a similar way.</p>
<p>When there are no access rights to the root directory of the main <strong class="pkg">GAP</strong> installation, it is also possible to install the package <em>outside the <strong class="pkg">GAP</strong> main directory</em> by unpacking it inside a directory <code class="file">MYGAPDIR/pkg</code>. Then to load the package <strong class="pkg">GAP</strong> should be started with <code class="code">-l ";MYGAPDIR"</code> option.</p>
<p>There are four files in the package which may need to be modified to setup and customise the package. The first three files are related with the server's functionality:
<ul>
<li><p>default <code class="code">InfoLevel</code> for the <code class="func">InfoSCSCP</code> (<a href="chap9.html#X831E6A5D8695A3F9"><span class="RefLink">9.2-1</span></a>) class;</p>
</li>
<li><p>default <strong class="pkg">SCSCP</strong> server name and port to be used by <code class="func">RunSCSCPserver</code> (<a href="chap5.html#X831C84577884215E"><span class="RefLink">5.2-1</span></a>) if <strong class="pkg">GAP</strong> is started with the <code class="file">scscp/example/myserver.g</code> file;</p>
</li>
<li><p>whether the server accepts calls to procedures which are standard <strong class="pkg">OpenMath</strong> symbols, or only procedures installed in the transient content dictionary (see <code class="func">InstallSCSCPprocedure</code> (<a href="chap5.html#X8031C2F4787E0C1A"><spanclass="RefLink">5.1-1</span></a>));</p>
</li>
<li><p>service description to be returned to the client by <code class="func">GetServiceDescription</code> (<a href="chap5.html#X7CBF8B63852898CF"><span class="RefLink">5.3-1</span></a>).</p>
</li>
</ul>
</li>
<li><p><code class="file">scscp/gapd.sh</code> is the script to start the <strong class="pkg">GAP</strong> <strong class="pkg">SCSCP</strong> server as a daemon. To use it, adjust the local call of <strong class="pkg">GAP</strong> and, if necessary, call options (for example, memory usage, startup from the workspace etc.) and the location of the root directory of the <strong class="pkg">SCSCP</strong> package in section 1 of this script.</p>
</li>
<li><p><code class="file">scscp/example/myserver.g</code> is an example of the server configuration file which loads all necessary packages, reads all needed code, installs all procedures which will be exposed to the client and finally starts the <strong class="pkg">SCSCP</strong> server (see Chapter <a href="chap5.html#X7DEE95317812A998"><span class="RefLink">5</span></a>).</p>
</li>
</ul>
<p>The fourth file is related with the client's functionality for parallel computations:
<ul>
<li><p>The file <code class="file">scscp/configpar.g</code> assigns the global variable <code class="code">SCSCPservers</code> which specifies a list of hosts and ports to search for <strong class="pkg">SCSCP</strong> services (which may be not only represented by <strong class="pkg">GAP</strong> services, but also by another <strong class="pkg">SCSCP</strong>-compliant systems). It will be used to run parallel computations with the <strong class="pkg">SCSCP</strong> package (see Chapter <a href="chap8.html#X7C80E6FA7CB91D28"><span class="RefLink">8</span></a>).</p>
</li>
</ul>
<p>See comments in these configuration files for further details and examples.</p>
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