<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE chapter SYSTEM "chapter.dtd"> <chapter> <header> <copyright> <year>2004</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. </legalnotice> <title>OS_Mon 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 OS_Mon application.</p> <section><title>Os_Mon 2.4</title> <section><title>Improvements and New Features</title> <list> <item> <p> cpu_sup should use native sysctl/libkvm calls on BSD</p> <p> This avoids forking off with os:cmd every time we just want to collect the load averages. riak does this every second, which results in a lot of unnecessary load.</p> <p> Own Id: OTP-12730</p> </item> <item> <p> Implement native cpu_sup:util/0,1 for FreeBSD</p> <p> Own Id: OTP-12796</p> </item> </list> </section> </section> <section><title>Os_Mon 2.3.1</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Do not crash with badmatch when integer part of loadavg has more than 2 digits.</p> <p> Own Id: OTP-12581</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> Fix compilation of memsup on OpenBSD.</p> <p> Own Id: OTP-12404</p> </item> </list> </section> </section> <section><title>Os_Mon 2.3</title> <section><title>Improvements and New Features</title> <list> <item> <p> Adds a new application parameter 'disksup_posix_only', to make diskup use only options defined in the POSIX standard.</p> <p> Own Id: OTP-12053</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.15</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Application upgrade (appup) files are corrected for the following applications: </p> <p> <c>asn1, common_test, compiler, crypto, debugger, dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe, inets, observer, odbc, os_mon, otp_mibs, parsetools, percept, public_key, reltool, runtime_tools, ssh, syntax_tools, test_server, tools, typer, webtool, wx, xmerl</c></p> <p> A new test utility for testing appup files is added to test_server. This is now used by most applications in OTP.</p> <p> (Thanks to Tobias Schlager)</p> <p> Own Id: OTP-11744</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> Calls to erlang:open_port/2 with 'spawn' are updated to handle space in the command path.</p> <p> Own Id: OTP-10842</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.14</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Fix incorrect reporting of memory on OS X via memsup. Thanks to Christopher Meiklejohn.</p> <p> Own Id: OTP-11454</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.13</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Use 'df -k -l' to query FreeBSD and OpenBSD about diskspace on local disks. Previously 'df' -k -t ufs' was used but this will not handle zfs or other disks. Just use '-l' instead of listing potential filesystems.</p> <p> Own Id: OTP-11207</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> Fix compilation on Solaris. Thanks to Maciej Malecki.</p> <p> Own Id: OTP-11213</p> </item> <item> <p> Fix broken cpu_sup:nprocs and others on Solaris 64-bit. Thanks to Simon Cornish.</p> <p> Own Id: OTP-11298</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.12</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Compilation fixes for NetBSD. Thanks to YAMAMOTO Takashi.</p> <p> Own Id: OTP-10941</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> Fixed disksup:get_disk_data for SUSv3, specifically OS X ML. Thanks to Sriram Melkote.</p> <p> Own Id: OTP-10945</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.11</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Removed deprecated function calls to snmp</p> <p> Own Id: OTP-10448</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.10</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Infinity timeout added to internal calls in disksup to allow it to work properly under very heavy load.</p> <p> Own Id: OTP-10100</p> </item> <item> <p>Clarify error messages from os_mon port programs</p> <p> Own Id: OTP-10161</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.9</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Fix segmentation fault in memsup</p> <p> when /proc/meminfo does not include information about buffers/cache (for instance inside OpenVZ container) (Thanks to Anton Vorobev)</p> <p> Own Id: OTP-9913</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.8</title> <section><title>Improvements and New Features</title> <list> <item> <p>Erlang/OTP can now be built using parallel make if you limit the number of jobs, for instance using '<c>make -j6</c>' or '<c>make -j10</c>'. '<c>make -j</c>' does not work at the moment because of some missing dependencies.</p> <p> Own Id: OTP-9451</p> </item> <item> <p> Tuple funs (a two-element tuple with a module name and a function) are now officially deprecated and will be removed in R16. Use '<c>fun M:F/A</c>' instead. To make you aware that your system uses tuple funs, the very first time a tuple fun is applied, a warning will be sent to the error logger.</p> <p> Own Id: OTP-9649</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.7</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p>Remove misc. compiler warnings</p> <p> Own Id: OTP-9542</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.6</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Add NetBSD support to memsup and disksup (Thanks to Andrew Thompson)</p> <p> Own Id: OTP-9216</p> </item> <item> <p> Add support for DragonFlyBSD to memsup</p> <p> DragonFly was partially supported by os_mon already but when trying to start the os_mon application it'd crash with an error about an unknown operating system in memsup. This patch changes memsup to use the FreeBSD sysctl method to get memory information when on DragonFly. (Thanks to Andrew Thompson )</p> <p> Own Id: OTP-9217</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.5</title> <section><title>Improvements and New Features</title> <list> <item> <p> Cleanups suggested by tidier and modernization of types and specs.</p> <p> Own Id: OTP-8455</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.4</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> Memsup did not read memory correctly on MaxOSX Snowleopard. This has now been corrected. (Thanks to Joel Reymont)</p> <p> Own Id: OTP-8211</p> </item> <item> <p> Removed unused code in <c>cpu_sup.erl</c>.</p> <p> Own Id: OTP-8226</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> The documentation is now built with open source tools (xsltproc and fop) that exists on most platforms. One visible change is that the frames are removed.</p> <p> Own Id: OTP-8201</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.3</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> A missing define in <c>memsup.c</c> caused a build error on IRIX machines. This has now been fixed.</p> <p> Own Id: OTP-8094</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.2</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> disksup:get_disk_data/0 returned disk volume in bytes instead of kbytes as stated in the documentation. The problem occurred on Windows only and is now corrected.</p> <p> *** POTENTIAL INCOMPATIBILITY ***</p> <p> Own Id: OTP-7741</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2.1</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p>An error in <c>memsup</c> could cause <c>os_mon</c> to report erroneous memory values on windows for ranges of memory between 2GB and 4GB. This have now been fixed.</p> <p> Own Id: OTP-7944</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p>Added support for dragonfly OS.</p> <p> Own Id: OTP-7938</p> </item> </list> </section> </section> <section><title>Os_Mon 2.2</title> <section><title>Improvements and New Features</title> <list> <item> <p>The copyright notices have been updated.</p> <p> Own Id: OTP-7851</p> </item> </list> </section> </section> <section><title>Os_Mon 2.1.8</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p>A problem with <c>OTP-OS-MON-MIB.mib</c> for 64-bit environments has now been fixed. The mib has been extended with 64-bit memory retrieval counterparts.</p><p>In addition, a new function <c>get_os_wordsize/0</c> has been added in the <c>memsup</c> module</p> <p> Own Id: OTP-7441</p> </item> <item> <p>An error in <c>memsup.c</c> caused the compilation to crash on bsd environments. This has now been fixed.</p> <p> Own Id: OTP-7558</p> </item> </list> </section> </section> <section><title>Os_Mon 2.1.7</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p>Fixed a build error that occurred on NetBSD (Thanks to Per Hedeland and Raphael Langerhorst)</p> <p> Own Id: OTP-7505</p> </item> </list> </section> <section><title>Improvements and New Features</title> <list> <item> <p> Memory information in <c>memsup:get_system_memory_data/0</c> now has additional entries in its property list for linux.</p> <p> Own Id: OTP-7409 Aux Id: seq10984 </p> </item> </list> </section> </section> <section><title>Os_Mon 2.1.6</title> <section><title>Fixed Bugs and Malfunctions</title> <list> <item> <p> System information retrieval on darwin platforms with environments locales not conforming to the C locale caused an error in <c>cpu_sup</c> resulting in process termination.</p> <p> Own Id: OTP-7320</p> </item> </list> </section> </section> <section><title>Os_Mon 2.1.5</title> <section><title>Improvements and New Features</title> <list> <item> <p> CPU utilization, on linux, is now measured via a port program instead of os:cmd in erlang. This should enhance performance.</p> <p> Own Id: OTP-7108 Aux Id: OTP-6935 </p> </item> </list> </section> </section> <section><title>Os_Mon 2.1.3</title> <section><title>Improvements and New Features</title> <list type="bulleted"> <item> <p> Extended memsup memory probing on linux to use a port program to probe memory usage. This is faster then the previous implementation.</p> <p> Own Id: OTP-6860 Aux Id: seq10616 </p> </item> </list> </section> </section> <section> <title>Os_Mon 2.1.2.1</title> <section> <title>Improvements and New Features</title> <list type="bulleted"> <item> <p>Minor Makefile changes.</p> <p>Own Id: OTP-6689</p> </item> </list> </section> </section> <section> <title>OS_Mon 2.1.2</title> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p>When the <c>memsup_system_only</c> flag was set to <c>true</c>, a <c>badmatch</c> exception occurred in the function <c>os_mon_mib:get_load/1</c>.</p> <p>Own Id: OTP-6351 Aux Id: seq10517</p> </item> </list> </section> </section> <section> <title>OS_Mon 2.1.1</title> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p>Did not build on Mac OS X.</p> <p>Added support for IRIX. (Thanks to Michel Urvoy and Daniel Solaz.)</p> <p>Own Id: OTP-6136</p> </item> </list> </section> <section> <title>Improvements and New Features</title> <list type="bulleted"> <item> <p><c>disksup</c>: Now using <c>round(T*100)</c> instead of <c>trunc(T*100)</c> when setting the threshold value given a float <c>T</c>.</p> <p>Own Id: OTP-6153</p> </item> </list> </section> </section> <section> <title>Os_Mon 2.1</title> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p>In 2.0, a call to <c>alarm_handler:get_alarms/0</c> was introduced in <c>memsup</c> and <c>disksup</c>. This will lead to problems if the default <c>alarm_handler</c> event handler is not used, however, and the call has now been removed. (Thanks to Serge Aleynikov for pointing this out.)</p> <p>Own Id: OTP-6029</p> </item> <item> <p>A bug that in rare cases caused <c>cpu_sup</c> to crash has been corrected.</p> <p>Own Id: OTP-6102 Aux Id: seq10312 </p> </item> </list> </section> </section> <section> <title>OS_Mon 2.0</title> <p>A note on backwards compatibility: The behaviour of OS_Mon 2.0 is backwards compatible under normal operation, but has changed somewhat in error situations: The services do not terminate and the API functions do not raise exceptions in all cases where they did before. Also, in the case where a service does terminate, the exit reason may be different. See below for details.</p> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p>A call to a OS_Mon service (cpu_sup, disksup, ...) when OS_Mon is not running, or when the service is not available for the OS, or when the service is not started, will no longer result in an exception. Instead a warning is issued via error_logger and a dummy value is returned, which one is specified in the man pages for the respective service.</p> <p>The reason is that it should not be necessary for a service to be started on each and every node of a distributed Erlang system for the OS-MON-MIB and other OS_Mon users to work properly.</p> <p>Own Id: OTP-4332 Aux Id: seq7358 </p> </item> <item> <p>References to the obsolete EVA application in OTP-OS-MON-MIB has been removed.</p> <p>Own Id: OTP-5699</p> </item> <item> <p>Setting the option <c>memsup_system_only</c> to <c>true</c> did not work, but would crash the <c>memsup</c> process.</p> <p>Own Id: OTP-5890 Aux Id: seq10185 </p> </item> <item> <p><c>cpu_sup:nprocs/0</c> returned 0 on FreeBsd.</p> <p>Own Id: OTP-5901</p> </item> <item> <p>If the OS_Mon service <c>disksup</c> or <c>memsup</c> was restarted, the same alarm could be set twice. Also, set alarms were not cleared when the application was stopped.</p> <p>Own Id: OTP-5910</p> </item> </list> </section> <section> <title>Improvements and New Features</title> <list type="bulleted"> <item> <p>Thresholds and time intervals in <c>disksup</c> and <c>memsup</c> are now configurable in run-time.</p> <p>Own Id: OTP-4246 Aux Id: Seq7230 </p> </item> <item> <p><c>memsup</c> can now handle systems with more than 4GB of RAM.</p> <p>Own Id: OTP-5800 Aux Id: seq10130 </p> </item> <item> <p>The entire OS_Mon application (code and documentation) has been reviewed and consequently updated with the goal to make the application more robust, homogeneous and easier to configure.</p> <p>The behaviour under normal operation is backwards compatible. However, recoverable errors now no longer terminate the affected service (and thus possible the entire application), instead <c>error_logger</c> is used to warn the user if/when such errors occurs. Also, in the case of unrecoverable errors, the services have been made more homogeneous with respect to behavior and exit reasons. See below for more information and refer to the man pages for details.</p> <p>Port handling has been unified, meaning that if a port program sends garbage or unexpectedly dies, this is now handled the same way by all OS_Mon services, namely immediate process termination with the exit reason <c>{port_error,Garbage}</c> or <c>{port_died,Reason}</c>, respectively.</p> <p>Application configuration parameter handling has been unified. Bad parameter values are no longer silently ignored (<c>disksup</c>) or cause application termination (<c>memsup</c>, <c>os_sup</c>). Instead a warning is issued and the default value for the parameter is used. Also, some cases where a bad parameter value accidentally could be accepted have been corrected.</p> <p>Message handling has been unified. Unknown (<c>gen_server-</c>) calls cause process termination, whereas unknown casts and messages are now ignored by all OS_Mon services.</p> <p>Own Id: OTP-5897</p> </item> <item> <p>The following changes have been made to the <c>os_sup</c> service:</p> <p>It is now available on Windows, using <c>nteventlog</c> as backend.</p> <p>On Solaris, enabling the service (that is, installing a new configuration file for <c>syslogd</c> etc.) can now be done outside the <c>os_sup</c> process. The reason for this is that the Erlang emulator should normally not be run with <c>root</c> privileges, as is otherwise required. The new application configuration parameter <c>os_sup_config</c> must be set to <c>false</c>.</p> <p>Also, <c>os_sup</c> can now be configured using a new configuration parameter <c>os_sup_mfa</c> to call an arbitrary Erlang function when a message is received from the OS.</p> <p>Own Id: OTP-5925</p> </item> <item> <p>The <c>memsup</c> service has been rewritten, replacing the supervised <c>memsup_helper</c> with a linked help process. This gives the <c>memsup</c> process more control and prevents a situation where it gets out of synch with the received memory data and thus possibly returns erroneous results.</p> <p>Own Id: OTP-5927</p> </item> </list> </section> </section> <section> <title>OS_Mon 1.8.1</title> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p><c>cpu_sup:util/0</c> failed with error reason <c>negative_diff</c> when called the first time on a machine (hw) that had been up for a very long time.</p> <p>Own Id: OTP-5869 Aux Id: seq10166</p> </item> </list> </section> </section> <section> <title>OS_Mon 1.8</title> <section> <title>Improvements and New Features</title> <list type="bulleted"> <item> <p>The memsup part of the OS_Mon application has been made more stable. If there are (possibly temporary) problems collecting memory data, the interface functions (<c>get_memory_data/0</c>, <c>get_system_memory_data/0</c>) now do not fail, but return the previously collected value, if any, or a dummy value otherwise. Also, a warning message is printed.</p> <p>*** POTENTIAL INCOMPATIBILITY ***</p> <p>Own Id: OTP-5798</p> </item> </list> </section> </section> <section> <title>OS_Mon 1.7.4</title> <section> <title>Fixed Bugs and Malfunctions</title> <list type="bulleted"> <item> <p>Corrected several problems in the error handling/error recovery (especially when OS_Mon is starting up).</p> <p>Own Id: OTP-5559</p> </item> </list> </section> </section> <section> <title>OS_Mon 1.7.3</title> <section> <title>Improvements and New Features</title> <list type="bulleted"> <item> <p><c>memsup.c</c> will now compile on OpenBSD. (Thanks to Geoff White and Jay Nelson.)</p> <p>The <c>disksup</c> and <c>cpu_sup</c> modules now work on Mac OS X (tested on Mac OS 10.3.8).</p> <p>The <c>memsup</c> module should now work on Linux 2.6.* as well as on older Linuxes. (<c>/proc/meminfo</c> has slightly different formats in different releases of Linux.)</p> <p>Own Id: OTP-5421 <br></br> Aux Id: OTP-5194, OTP-5228, OTP-5291 </p> </item> </list> </section> </section> <section> <title>OS_Mon 1.7.2</title> <p>This version is identical with 1.7.</p> </section> </chapter>