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@crownedgrouse
crownedgrouse committed Jan 26, 2019
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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
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<section>
<title>Getting Started</title>
<p>Run Observer from a standalone node to minimize the impact of the
<p>Run Observer from a standalone node to minimize the impact of the
system being observed.
</p>
<p><em>Example:</em></p>
<pre>
% <input>erl -sname observer -hidden -setcookie MyCookie -run observer</input></pre>
<p>
Select the node to observe with menu <em>Nodes</em>.
Menu <em>View &gt; Refresh interval</em> controls how often
Select the node to observe with menu <em>Nodes</em>.
Menu <em>View &gt; Refresh interval</em> controls how often
the view is to be updated.
The refresh interval is set per viewer so you can
have different settings for each viewer. To minimize the system
impact, only the active viewer is updated. Other views are updated
impact, only the active viewer is updated. Other views are updated
when activated.
</p>

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<section>
<title>System Tab</title>
<p>Tab <em>System</em> displays general information about the active Erlang node
and its runtime system, such as build configuration, system capabilities, and
<p>Tab <em>System</em> displays general information about the active Erlang node
and its runtime system, such as build configuration, system capabilities, and
overall use statistics.
</p>
</section>

<section>
<title>Load Charts Tab</title>
<p>Tab <em>Load Charts</em> displays graphs of the current resource use on
<p>Tab <em>Load Charts</em> displays graphs of the current resource use on
the active Erlang node.</p>
<p>Graph <c>Scheduler Utilization</c> shows scheduler use per scheduler,
<p>Graph <c>Scheduler Utilization</c> shows scheduler use per scheduler,
where each scheduler use has a unique color.</p>
<p>Graph <c>Memory Usage</c> shows the total memory use and per memory category
use, where each category has a unique color. The categories are as
use, where each category has a unique color. The categories are as
follows:</p>
<taglist>
<tag><c>Total</c></tag>
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<section>
<title>Memory Allocators Tab</title>
<p>Tab <em>Memory Allocators</em> displays detailed information of the carrier
size and current memory carriers. For details about memory carriers,
<p>Tab <em>Memory Allocators</em> displays detailed information of the carrier
size and current memory carriers. For details about memory carriers,
see module
<seealso marker="erts:erts_alloc"><c>erts_alloc</c></seealso>
in application ERTS.</p>
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</taglist>
</item>
<tag>Trace process</tag>
<item><p>Adds the selected process identifier to tab <em>Trace Overview</em>
<item><p>Adds the selected process identifier to tab <em>Trace Overview</em>
plus the node that the process resides on.</p></item>
<tag>Trace named process</tag>
<item><p>Adds the registered name of the process. This can be useful when tracing on
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<tag>Pid</tag>
<item><p>The process identifier.</p></item>
<tag>Reds</tag>
<item><p>The number of reductions executed on the process.
<item><p>The number of reductions executed on the process.
This can be presented as accumulated values or as values since the last update.</p></item>
<tag>Memory</tag>
<item><p>The size of the process, in bytes, obtained by a
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<tag>Log</tag>
<item><p>If enabled and available, shows the process SASL log entries.</p></item>
</taglist>

<note>
<p><em>Log</em> requires application SASL to be started on the observed node,
with <c>log_mf_h</c> as log handler.
The Observed node must be Erlang/OTP R16B02 or higher.
The <c>rb</c> server must not be started on the observed node when clicking menu
<em>Log &gt; Toggle log view</em>. The <c>rb</c> server is stopped on the observed node
The <c>rb</c> server must not be started on the observed node when clicking menu
<em>Log &gt; Toggle log view</em>. The <c>rb</c> server is stopped on the observed node
when exiting or changing the observed node.
</p>
</note>

<p>Option <em>Trace selected processes</em> adds the selected process identifiers to tab
<em>Trace Overview</em> plus the node that the processes reside on.
</p>
<p>Option <em>Trace selected processes by name</em> adds the registered name of the processes. This can be
useful when tracing is done on many nodes, as processes with that name are then traced on
<p>Option <em>Trace selected processes by name</em> adds the registered name of the processes. This can be
useful when tracing is done on many nodes, as processes with that name are then traced on
all traced nodes.</p>
<p>Option <em>Kill process</em> brutally kills the processes under
the mouse pointer by sending an exit signal with
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</p>

<p>Click button <em>Start Trace</em> to start the trace.
By default, trace output is written to a new window. Tracing is stopped
By default, trace output is written to a new window. Tracing is stopped
when the window is closed, or when clicking button <em>Stop Trace</em>.
Trace output can be changed with menu <em>Options > Output</em>.
The trace settings, including match specifications, can be saved to,
The trace settings, including match specifications, can be saved to,
or loaded from, a file.
</p>
<p>For details about tracing, see module <seealso
marker="runtime_tools:dbg">dbg</seealso> in application Runtime_Tools
and in section "Match specifications in Erlang" in
and in section "Match specifications in Erlang" in
<seealso marker="erts:match_spec"><c>ERTS User's Guide</c></seealso>
and in module
<seealso marker="stdlib:ms_transform"><c>ms_transform</c></seealso>
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