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+<?xml version="1.0" encoding="latin1" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+ <header>
+ <copyright>
+ <year>2004</year><year>2009</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.
+
+ </legalnotice>
+
+ <title>Observer Release Notes</title>
+ <prepared>otp_appnotes</prepared>
+ <docno>nil</docno>
+ <date>nil</date>
+ <rev>nil</rev>
+ <file>notes.xml</file>
+ </header>
+ <p>This document describes the changes made to the Observer
+ application.</p>
+
+<section><title>Observer 0.9.8.1</title>
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Major improvements of the Erlang distribution for Erlang
+ runtime systems with SMP support. Previously distribution
+ port locks were heavily contended, and all encoding and
+ decoding for a specific distribution channel had to be
+ done in sequence. Lock contention due to the distribution
+ is now negligible and both encoding and decoding of
+ Erlang messages can be done in parallel.</p>
+ <p>
+ The old atom cache protocol used by the Erlang
+ distribution has been dropped since it effectively
+ prevented all parallel encoding and decoding of messages
+ passed over the same distribution channel.</p>
+ <p>
+ A new atom cache protocol has been introduced which
+ isolates atom cache accesses and makes parallel encoding
+ and decoding of messages passed over the same
+ distribution channel possible. The new atom cache
+ protocol also use an atom cache size 8 times larger than
+ before. The new atom cache protocol is documented in the
+ ERTS users guide.</p>
+ <p>
+ Erlang messages received via the distribution are now
+ decoded by the receiving Erlang processes without holding
+ any distribution channel specific locks. Erlang messages
+ and signals sent over the distribution are as before
+ encoded by the sending Erlang process, but now without
+ holding any distribution channel specific locks during
+ the encoding. That is, both encoding and decoding can be
+ and are done in parallel regardless of distribution
+ channel used.</p>
+ <p>
+ The part that cannot be parallelized is the atom cache
+ updates. Atom cache updates are therefore now scheduled
+ on the distribution port. Since it is only one entity per
+ distribution channel doing this work there is no lock
+ contention due to the atom cache updates.</p>
+ <p>
+ The new runtime system does not understand the old atom
+ cache protocol. New and old runtime systems can however
+ still communicate, but no atom cache will be used.</p>
+ <p>
+ Own Id: OTP-7774</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Observer 0.9.8</title>
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ <c>etop</c> would crash if the emulator's custom
+ allocators had been turned off (e.g. using the
+ <c>+Meamin</c> option).</p>
+ <p>
+ Own Id: OTP-7519</p>
+ </item>
+ <item>
+ <p>The copyright notices have been updated.</p>
+ <p>
+ Own Id: OTP-7851</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+ <section>
+ <title>Observer 0.9.7.4</title>
+
+ <section>
+ <title>Improvements and New Features</title>
+ <list type="bulleted">
+ <item>
+ <p>Minor Makefile changes.</p>
+ <p>Own Id: OTP-6689</p>
+ </item>
+ <item>
+ <p>Obsolete guard tests (such as list()) have been replaced
+ with the modern guard tests (such as is_list()).</p>
+ <p>Own Id: OTP-6725</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.7.3</title>
+
+ <section>
+ <title>Improvements and New Features</title>
+ <list type="bulleted">
+ <item>
+ <p>This application has been updated to eliminate warnings
+ by Dialyzer.</p>
+ <p>Own Id: OTP-6551</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.7.2</title>
+
+ <section>
+ <title>Fixed Bugs and Malfunctions</title>
+ <list type="bulleted">
+ <item>
+ <p>Several minor bugs and race conditions eliminated in the
+ runtime_tools and observer applications.</p>
+ <p>Own Id: OTP-6265</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.7.1</title>
+
+ <section>
+ <title>Fixed Bugs and Malfunctions</title>
+ <list type="bulleted">
+ <item>
+ <p>Crash dump with large integers could crash the
+ <c>crashdump_viewer</c>.</p>
+ <p>Own Id: OTP-6301</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.7 (R11B)</title>
+
+ <section>
+ <title>Fixed Bugs and Malfunctions</title>
+ <list type="bulleted">
+ <item>
+ <p>Fixed a bug in <c>etop</c> which made the Load and Memory
+ information in the header incorrect -- for example the
+ value shown for <c>binary</c> (memory allocated for
+ binaries) was actually the number of currently running
+ processes. (Thanks to Rikard Johansson.)</p>
+ <p>Own Id: OTP-6075</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.6.2</title>
+
+ <section>
+ <title>Fixed Bugs and Malfunctions</title>
+ <list type="bulleted">
+ <item>
+ <p>The Observer application has been recompiled because of
+ a compiler bug.</p>
+ <p>Own Id: OTP-5700</p>
+ </item>
+ </list>
+ </section>
+ </section>
+
+ <section>
+ <title>Observer 0.9.6.1</title>
+
+ <section>
+ <title>Fixed Bugs and Malfunctions</title>
+ <list type="bulleted">
+ <item>
+ <p><c>crashdump_viewer</c> is faster when showing message,
+ dictionary, and stack dump for large processes.</p>
+ <p>Own Id: OTP-5408</p>
+ </item>
+ </list>
+ </section>
+ </section>
+</chapter>
+