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<?xml version="1.0" encoding="latin1" ?>
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<!DOCTYPE chapter SYSTEM "chapter.dtd">
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<holder>Ericsson AB, All Rights Reserved</holder>
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The contents of this file are subject to the Erlang Public License,
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Version 1.1, (the "License"); you may not use this file except in
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compliance with the License. You should have received a copy of the
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Erlang Public License along with this software. If not, it can be
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retrieved online at http://www.erlang.org/.
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Software distributed under the License is distributed on an "AS IS"
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basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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the License for the specific language governing rights and limitations
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The Initial Developer of the Original Code is Ericsson AB.
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<title>OS_Mon Release Notes</title>
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<prepared>otp_appnotes</prepared>
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<p>This document describes the changes made to the OS_Mon application.</p>
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<section><title>Os_Mon 2.1.8</title>
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<section><title>Fixed Bugs and Malfunctions</title>
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<p>A problem with <c>OTP-OS-MON-MIB.mib</c> for 64-bit
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environments has now been fixed. The mib has been
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extended with 64-bit memory retrieval
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counterparts.</p><p>In addition, a new function
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<c>get_os_wordsize/0</c> has been added in the
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<c>memsup</c> module</p>
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<p>An error in <c>memsup.c</c> caused the compilation to
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crash on bsd environments. This has now been fixed.</p>
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<section><title>Os_Mon 2.1.7</title>
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<section><title>Fixed Bugs and Malfunctions</title>
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<p>Fixed a build error that occurred on NetBSD (Thanks to
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Per Hedeland and Raphael Langerhorst)</p>
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<section><title>Improvements and New Features</title>
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<p> Memory information in
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<c>memsup:get_system_memory_data/0</c> now has additional
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entries in its property list for linux.</p>
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Own Id: OTP-7409 Aux Id: seq10984 </p>
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<section><title>Os_Mon 2.1.6</title>
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<section><title>Fixed Bugs and Malfunctions</title>
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System information retrieval on darwin platforms with
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environments locales not conforming to the C locale
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caused an error in <c>cpu_sup</c> resulting in process
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<section><title>Os_Mon 2.1.5</title>
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<section><title>Improvements and New Features</title>
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CPU utilization, on linux, is now measured via a port
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program instead of os:cmd in erlang. This should enhance
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Own Id: OTP-7108 Aux Id: OTP-6935 </p>
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<section><title>Os_Mon 2.1.3</title>
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<section><title>Improvements and New Features</title>
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<list type="bulleted">
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Extended memsup memory probing on linux to use a port
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program to probe memory usage. This is faster then the
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previous implementation.</p>
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Own Id: OTP-6860 Aux Id: seq10616 </p>
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<title>Os_Mon 2.1.2.1</title>
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<title>Improvements and New Features</title>
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<list type="bulleted">
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<p>Minor Makefile changes.</p>
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<p>Own Id: OTP-6689</p>
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<title>OS_Mon 2.1.2</title>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p>When the <c>memsup_system_only</c> flag was set to
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<c>true</c>, a <c>badmatch</c> exception occurred in the
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function <c>os_mon_mib:get_load/1</c>.</p>
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<p>Own Id: OTP-6351 Aux Id: seq10517</p>
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<title>OS_Mon 2.1.1</title>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p>Did not build on Mac OS X.</p>
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<p>Added support for IRIX. (Thanks to Michel Urvoy and
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<p>Own Id: OTP-6136</p>
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<title>Improvements and New Features</title>
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<list type="bulleted">
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<p><c>disksup</c>: Now using <c>round(T*100)</c> instead of
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<c>trunc(T*100)</c> when setting the threshold value
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given a float <c>T</c>.</p>
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<p>Own Id: OTP-6153</p>
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<title>Os_Mon 2.1</title>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p>In 2.0, a call to <c>alarm_handler:get_alarms/0</c> was
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introduced in <c>memsup</c> and <c>disksup</c>. This will
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lead to problems if the default <c>alarm_handler</c>
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event handler is not used, however, and the call has now
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been removed. (Thanks to Serge Aleynikov for pointing
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<p>Own Id: OTP-6029</p>
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<p>A bug that in rare cases caused <c>cpu_sup</c> to crash
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has been corrected.</p>
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<p>Own Id: OTP-6102 Aux Id: seq10312 </p>
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<title>OS_Mon 2.0</title>
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<p>A note on backwards compatibility: The behaviour of OS_Mon 2.0 is
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backwards compatible under normal operation, but has changed
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somewhat in error situations: The services do not terminate
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and the API functions do not raise exceptions in all cases where
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they did before. Also, in the case where a service does terminate,
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the exit reason may be different. See below for details.</p>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p>A call to a OS_Mon service (cpu_sup, disksup, ...) when
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OS_Mon is not running, or when the service is not
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available for the OS, or when the service is not started,
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will no longer result in an exception. Instead a warning
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is issued via error_logger and a dummy value is returned,
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which one is specified in the man pages for the
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respective service.</p>
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<p>The reason is that it should not be necessary for a
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service to be started on each and every node of a
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distributed Erlang system for the OS-MON-MIB and other
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OS_Mon users to work properly.</p>
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<p>Own Id: OTP-4332 Aux Id: seq7358 </p>
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<p>References to the obsolete EVA application in
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OTP-OS-MON-MIB has been removed.</p>
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<p>Own Id: OTP-5699</p>
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<p>Setting the option <c>memsup_system_only</c> to
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<c>true</c> did not work, but would crash the
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<c>memsup</c> process.</p>
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<p>Own Id: OTP-5890 Aux Id: seq10185 </p>
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<p><c>cpu_sup:nprocs/0</c> returned 0 on FreeBsd.</p>
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<p>Own Id: OTP-5901</p>
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<p>If the OS_Mon service <c>disksup</c> or <c>memsup</c> was
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restarted, the same alarm could be set twice. Also, set
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alarms were not cleared when the application was stopped.</p>
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<p>Own Id: OTP-5910</p>
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<title>Improvements and New Features</title>
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<list type="bulleted">
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<p>Thresholds and time intervals in <c>disksup</c> and
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<c>memsup</c> are now configurable in run-time.</p>
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<p>Own Id: OTP-4246 Aux Id: Seq7230 </p>
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<p><c>memsup</c> can now handle systems with more than 4GB
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<p>Own Id: OTP-5800 Aux Id: seq10130 </p>
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<p>The entire OS_Mon application (code and documentation)
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has been reviewed and consequently updated with the goal
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to make the application more robust, homogeneous and
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easier to configure.</p>
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<p>The behaviour under normal operation is backwards
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compatible. However, recoverable errors now no longer
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terminate the affected service (and thus possible the
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entire application), instead <c>error_logger</c> is used
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to warn the user if/when such errors occurs. Also, in the
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case of unrecoverable errors, the services have been made
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more homogeneous with respect to behavior and exit
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reasons. See below for more information and refer to the
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man pages for details.</p>
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<p>Port handling has been unified, meaning that if a port
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program sends garbage or unexpectedly dies, this is now
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handled the same way by all OS_Mon services, namely
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immediate process termination with the exit reason
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<c>{port_error,Garbage}</c> or <c>{port_died,Reason}</c>,
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<p>Application configuration parameter handling has been
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unified. Bad parameter values are no longer silently
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ignored (<c>disksup</c>) or cause application termination
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(<c>memsup</c>, <c>os_sup</c>). Instead a warning is
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issued and the default value for the parameter is used.
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Also, some cases where a bad parameter value accidentally
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could be accepted have been corrected.</p>
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<p>Message handling has been unified. Unknown
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(<c>gen_server-</c>) calls cause process termination,
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whereas unknown casts and messages are now ignored by all
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<p>Own Id: OTP-5897</p>
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<p>The following changes have been made to the <c>os_sup</c>
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<p>It is now available on Windows, using <c>nteventlog</c>
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<p>On Solaris, enabling the service (that is, installing a
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new configuration file for <c>syslogd</c> etc.) can now
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be done outside the <c>os_sup</c> process. The reason for
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this is that the Erlang emulator should normally not be
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run with <c>root</c> privileges, as is otherwise
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required. The new application configuration parameter
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<c>os_sup_config</c> must be set to <c>false</c>.</p>
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<p>Also, <c>os_sup</c> can now be configured using a new
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configuration parameter <c>os_sup_mfa</c> to call an
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arbitrary Erlang function when a message is received from
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<p>Own Id: OTP-5925</p>
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<p>The <c>memsup</c> service has been rewritten, replacing
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the supervised <c>memsup_helper</c> with a linked help
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process. This gives the <c>memsup</c> process more
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control and prevents a situation where it gets out of
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synch with the received memory data and thus possibly
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returns erroneous results.</p>
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<p>Own Id: OTP-5927</p>
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<title>OS_Mon 1.8.1</title>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p><c>cpu_sup:util/0</c> failed with error reason
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<c>negative_diff</c> when called the first time on a
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machine (hw) that had been up for a very long time.</p>
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<p>Own Id: OTP-5869 Aux Id: seq10166</p>
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<title>OS_Mon 1.8</title>
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<title>Improvements and New Features</title>
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<list type="bulleted">
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<p>The memsup part of the OS_Mon application has been made
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more stable. If there are (possibly temporary) problems
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collecting memory data, the interface functions
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(<c>get_memory_data/0</c>,
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<c>get_system_memory_data/0</c>) now do not fail, but
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return the previously collected value, if any, or a dummy
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value otherwise. Also, a warning message is printed.</p>
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<p>*** POTENTIAL INCOMPATIBILITY ***</p>
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<p>Own Id: OTP-5798</p>
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<title>OS_Mon 1.7.4</title>
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<title>Fixed Bugs and Malfunctions</title>
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<list type="bulleted">
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<p>Corrected several problems in the error handling/error
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recovery (especially when OS_Mon is starting up).</p>
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<p>Own Id: OTP-5559</p>
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<title>OS_Mon 1.7.3</title>
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<title>Improvements and New Features</title>
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<list type="bulleted">
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<p><c>memsup.c</c> will now compile on OpenBSD. (Thanks to
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Geoff White and Jay Nelson.)</p>
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<p>The <c>disksup</c> and <c>cpu_sup</c> modules now work on
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Mac OS X (tested on Mac OS 10.3.8).</p>
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<p>The <c>memsup</c> module should now work on Linux 2.6.* as
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well as on older Linuxes. (<c>/proc/meminfo</c> has
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slightly different formats in different releases of
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<p>Own Id: OTP-5421 <br></br>
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Aux Id: OTP-5194, OTP-5228, OTP-5291 </p>
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<title>OS_Mon 1.7.2</title>
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<p>This version is identical with 1.7.</p>
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