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+<?xml version="1.0" encoding="latin1" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+ <header>
+ <copyright>
+ <year>1997</year>
+ <year>2007</year>
+ <holder>Ericsson AB, All Rights Reserved</holder>
+ </copyright>
+ <legalnotice>
+ The contents of this file are subject to the Erlang Public License,
+ Version 1.1, (the "License"); you may not use this file except in
+ compliance with the License. You should have received a copy of the
+ Erlang Public License along with this software. If not, it can be
+ retrieved online at http://www.erlang.org/.
+
+ Software distributed under the License is distributed on an "AS IS"
+ basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ the License for the specific language governing rights and limitations
+ under the License.
+
+ The Initial Developer of the Original Code is Ericsson AB.
+ </legalnotice>
+
+ <title>Erlang on embedded systems</title>
+ <prepared>Fredrik Tillman</prepared>
+ <responsible></responsible>
+ <docno>ETX/B/SFP/TILLMAN:96-001</docno>
+ <approved></approved>
+ <checked></checked>
+ <date>1997-11-12</date>
+ <rev>PA1</rev>
+ <file>intro.sgml</file>
+ </header>
+ <p>This manual is a complement to the other manuals and describes how
+ to install, run and maintain Erlang on an embedded system.
+ </p>
+ <p>For more informaton about how to install and start Erlang read
+ XXXXXXXX.
+ </p>
+
+ <section>
+ <title>Memory Usage</title>
+ <p>Solaris takes about 17 Mbyte of RAM on a system with 64 Mbyte of
+ total RAM. This leaves about 47 Mbyte for the applications. If
+ the system utilizes swapping, these figures cannot be improved
+ because unnecessary daemon processes are swapped out. However,
+ if swapping is disabled, or if the swap space is a precious
+ resource in the system, it becomes necessary to kill off
+ unnecessary daemon processes.
+ </p>
+ <p>The following start-scripts can be deleted to
+ prevent unnecessary daemons from starting:
+ </p>
+ <list type="bulleted">
+ <item><c>/etc/rc2.d/S72autoinstall</c></item>
+ <item><c>/etc/rc2.d/S74autofs</c></item>
+ <item><c>/etc/rc2.d/S76nscd</c></item>
+ <item><c>/etc/rc2.d/S80PRESERVE</c></item>
+ <item><c>/etc/rc2.d/S80lp</c></item>
+ <item><c>/etc/rc2.d/S88sendmail</c></item>
+ <item><c>/etc/rc2.d/S92volmgt</c></item>
+ <item><c>/etc/rc2.d/S93cacheos.finish</c></item>
+ <item><c>/etc/rc3.d/S15nfs.server</c></item>
+ </list>
+ <p>More information is expected from Sun on how to modify the
+ kernel in order to reduce the memory consumption. This will be
+ performed by modifying the <c>/etc/system</c> file.</p>
+ </section>
+
+ <section>
+ <title>Disk Space Usage</title>
+ <p>The disk space required by Solaris can be minimized by using the
+ Core User support installation. It requires about 80 Mbyte of
+ disk space. This installs only the minimum software required to
+ boot and run Solaris. The disk space can be further reduced by
+ deleting unnecessary individual files. However, unless disk
+ space is a critical resource the effort required and the risks
+ involved may not be justified.</p>
+ </section>
+
+ <section>
+ <title>Other Issues</title>
+ <p>Future releases of OTP will include more information on how
+ Solaris can be configured for use with embedded systems to get
+ maximum performance. Issues which will be investigated include:
+ </p>
+ <list type="bulleted">
+ <item>how disabling swapping affects the system</item>
+ <item>how locking processes in memory may yield performance benefits.</item>
+ </list>
+ </section>
+</chapter>
+