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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2002</year>
<year>2017</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.
The Initial Developer of the Original Code is Ericsson AB.
</legalnotice>
<title>etop</title>
<prepared>Siri Hansen</prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date></date>
<rev></rev>
<file></file>
</header>
<module>etop</module>
<modulesummary>Erlang Top is a tool for presenting information about Erlang
processes similar to the information presented by "top" in UNIX.</modulesummary>
<description>
<p>Start Erlang Top with the provided scripts
<c>etop</c>. This starts a hidden Erlang node
that connects to the node to be measured. The measured node is
specified with option <c>-node</c>. If the measured node has a
different cookie than the default cookie for the user who
invokes the script, the cookie must be explicitly specified with
option <c>-setcookie</c>.</p>
<p>Under Windows, batch file <c>etop.bat</c> can be used.</p>
<p>When executing the <c>etop</c> script, configuration
parameters can be specified as command-line options,
for example, <c>etop -node testnode@myhost -setcookie MyCookie</c>.
The following configuration parameters exist for the
tool:</p>
<taglist>
<tag><c>node</c></tag>
<item><p>The measured node.</p>
<p>Value: <c>atom()</c></p>
<p>Mandatory</p></item>
<tag><c>setcookie</c></tag>
<item><p>Cookie to use for the <c>etop</c> node. Must be same as the
cookie on the measured node.</p>
<p>Value: <c>atom()</c></p></item>
<tag><c>lines</c></tag>
<item><p>Number of lines (processes) to display.</p>
<p>Value: <c>integer()</c></p>
<p>Default: <c>10</c></p></item>
<tag><c>interval</c></tag>
<item><p>Time interval (in seconds) between each update of
the display.</p>
<p>Value: <c>integer()</c></p>
<p>Default: <c>5</c></p></item>
<tag><c>accumulate</c></tag>
<item><p>If <c>true</c>, the execution time and reductions are
accumulated.</p>
<p>Value: <c>boolean()</c></p>
<p>Default: <c>false</c></p></item>
<tag><c>sort</c></tag>
<item><p>Identifies what information to sort by.</p>
<p>Value: <c>runtime | reductions | memory | msg_q</c></p>
<p>Default: <c>runtime</c> (<c>reductions</c> if <c>tracing=off</c>)</p></item>
<tag><c>tracing</c></tag>
<item><p><c>etop</c> uses the Erlang trace facility, and thus no
other tracing is possible on the measured node while
<c>etop</c> is running, unless this option is set to
<c>off</c>. Also helpful if the <c>etop</c> tracing causes too
high load on the measured node. With tracing off, runtime is
not measured.</p>
<p>Value: <c>on | off</c></p>
<p>Default: <c>on</c></p></item>
</taglist>
<p>For details about Erlang Top, see the
<seealso marker="etop_ug">User's Guide</seealso>.</p>
</description>
<funcs>
<func>
<name since="OTP R15B01">start() -> ok</name>
<fsummary>Start etop.</fsummary>
<desc>
<p>Starts <c>etop</c>.
Notice that <c>etop</c> is preferably started with the <c>etop</c> script.</p>
</desc>
</func>
<func>
<name since="OTP R15B01">start(Options) -> ok</name>
<fsummary>Start etop.</fsummary>
<type>
<v>Options = [Option]</v>
<v>Option = {Key, Value}</v>
<v>Key = atom()</v>
<v>Value = term()</v>
</type>
<desc>
<p>Starts <c>etop</c>. To view the possible options, use
<seealso marker="#help/0"><c>help/0</c></seealso>.</p>
</desc>
</func>
<func>
<name since="OTP R15B01">help() -> ok</name>
<fsummary>Display the etop help.</fsummary>
<desc>
<p>Displays the help of <c>etop</c> and
its options.</p>
</desc>
</func>
<func>
<name>config(Key,Value) -> Result</name>
<fsummary>Change the configuration of the tool.</fsummary>
<type>
<v>Result = ok | {error,Reason}</v>
<v>Key = lines | interval | accumulate | sort</v>
<v>Value = term()</v>
</type>
<desc>
<p>Changes the configuration parameters of the tool during runtime.
Allowed parameters are <c>lines</c>, <c>interval</c>, <c>accumulate</c>,
and <c>sort</c>.</p>
</desc>
</func>
<func>
<name>dump(File) -> Result</name>
<fsummary>Dump the current display to a file.</fsummary>
<type>
<v>Result = ok | {error,Reason}</v>
<v>File = string()</v>
</type>
<desc>
<p>Dumps the current display to a text file.</p>
</desc>
</func>
<func>
<name>stop() -> stop</name>
<fsummary>Terminate etop.</fsummary>
<desc>
<p>Terminates <c>etop</c>.</p>
</desc>
</func>
</funcs>
</erlref>
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