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page.title=Memory Monitor Walkthrough
meta.tags="android, performance, profiling, tools, memory, memoryleaks, garbagecollection, memorymonitor"
page.tags="android", "performance", "profiling", "tools", "memory", "memoryleaks", "garbagecollection", "memorymonitor"
page.metaDescription=Graph memory usage and garbage collection events for your app in real-time.
page.image=tools/performance/thumbnails/tools_memory_monitor.png
page.article=true
@jd:body
<style>
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list-style-type: none;
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padding-left: 10px;
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<div id="tb" style="margin-left: 7px; margin-bottom: 5px;">
<h2>In this document</h2>
<ul>
<li><a href="#WhatYouNeed">Prerequisites</a></li>
<li><a href="#WorkingWithMemoryMonitor">Working with Memory Monitor</a></li>
</ul>
<h2>You should also read</h2>
<ul>
<li><a href="{@docRoot}tools/performance/heap-viewer/index.html">
Heap Viewer Walkthrough</a></li>
<li><a href="{@docRoot}tools/performance/allocation-tracker/index.html">
Allocation Tracker Walkthrough</a></li>
<li><a href="{@docRoot}tools/performance/comparison.html">
Comparison: Memory Monitor, Heap Viewer, Allocation Tracker</a>
<li><a href="{@docRoot}tools/performance/traceview/index.html">
Traceview Walkthrough</a></li>
</ul>
</div>
<p>This walkthrough shows the basic usage and workflow for the Memory Monitor tool in Android
Studio. Memory Monitor reports in real-time how your app allocates memory.</p>
<p>What it's good for:</p>
<ul>
<li>Showing available and used memory in a graph, and garbage collection events over time.</li>
<li>Quickly testing whether app slowness might be related
to excessive garbage collection events.</li>
<li>Quickly testing whether app crashes may be related to running out of
memory.</li>
</ul>
<h2 id="WhatYouNeed">Prerequisites</h2>
<ul>
<li>A mobile device with <a href=
"http://developer.android.com/tools/device.html#developer-device-options">Developer Options</a>
enabled.</li>
<li>An Application with USB Debugging enabled. Use your own, or the <a href=
"https://github.com/udacity/Sunshine-Version-2">Sunshine</a> sample app from the <a href=
"https://www.udacity.com/course/ud853">Android Fundamentals Udacity course</a>.</li>
</ul>
<h2 id="WorkingWithMemoryMonitor">Working with Memory Monitor</h2>
<ul class="no-bullet">
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<li><div style="overflow:hidden">
<ol class="padded">
<div class="figure" style="">
<img src="{@docRoot}images/tools/performance/memory-monitor/gettingstarted_image001.png"
alt=""
width="300px" />
<p class="img-caption">
<strong>Figure 1. </strong>Starting Memory Monitor.
</p>
</div>
<li>If you're using a mobile device, connect it to your computer.</li>
<li>Open your application in Android Studio, build the source,
and run it on your device or emulator.</li>
<li>In Android Studio, choose <strong> Tools > Android > Memory Monitor</strong>. You
can also click the <em>Android</em> tab in the lower-left corner of the application
window to launch the Android runtime window. The CPU and Memory Monitor views appear.</li>
</ol>
</div></li>
<li><div style="overflow:hidden">
<hr>
<ol class="padded" start="7">
<div class="figure" style="">
<img src="{@docRoot}images/tools/performance/memory-monitor/gettingstarted_image003.png"
alt=""
width="400px" />
<p class="img-caption">
<strong>Figure 1. </strong>Allocated and free memory in Memory Monitor.
</p>
</div>
<li>Once Memory Monitor starts tracking your device, a stacked graph appears,
tracking memory usage over time.
<p>Dark blue: Amount of memory that your app
is currently using.</p>
<p>Light blue: Available, unallocated memory.</p>
</li>
<li>Over time, this graph updates, showing changes in memory usage.</li>
<li>As your app allocates and frees memory, the allocated amount shown in the
graph changes.</li>
<li>When you see the allocated memory drop by a large amount, a garbage
collection (GC) event has occurred.</li>
</ol>
</div></li>
<li><div style="overflow:hidden">
<hr>
<ol class="padded" start="11">
<div class="figure" style="">
<img src="{@docRoot}images/tools/performance/memory-monitor/gettingstarted_image005.png"
alt=""
width="400px" />
<p class="img-caption">
<strong>Figure 2. </strong>Forcing a GC (Garbage Collection) event.
</p>
</div>
<li>You can force a garbage collection event by clicking on the garbage truck
icon
<img src="{@docRoot}images/tools/performance/memory-monitor/gettingstarted_image004.png">.
</li>
</ol>
</div></li>
</ul>
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