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<title>About Memory</title>
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<body>
<div id='header'>
<h1>
About memory
</h1>
<p>
Measuring memory usage in a multi-process browser
</p>
</div>
<div id='content'>
<h2>
Summary
<div class='help'>
<div>
<p>
Summary of memory used by currently active browsers.
For browsers which use multiple processes, memory reflects
aggregate memory used across all browser processes.<p>
For Chromium, processes used to to display diagnostics
information (such as this "about:memory") are excluded.
</p>
</div>
</div>
</h2>
<table class='list' id='browserComparison'>
<colgroup>
<col class='name' />
<col class='number' />
<col class='number' />
</colgroup>
<tr class='firstRow doNotFilter'>
<th>
</th>
<th colspan='2'>
Memory
<div class='help'>
<div>
<p>
<strong>Memory</strong>
</p>
<p>
<strong>Private:</strong>
Resident memory size that is not shared with any other process.
This is the best indicator of browser memory resource usage.
</p>
<p>
<strong>Proportional:</strong>
Accounts for each page of memory as a fraction based on the number of
processes that have it mapped. Thus, for each page of memory mapped by two
processes, this sum will count half of the bytes towards each.
Therefore, this number is greater than the private count.
</p>
<p><i>(Note that the memory for this tab is not included in the browser totals)</i></p>
</div>
</div>
</th>
</tr>
<tr class='secondRow doNotFilter'>
<th class='name'>
Browser
</th>
<th class='name'>
Private
</th>
<th class='number'>
Proportional
</th>
</tr>
<tr jsselect="browsers">
<td class='name'>
<div>
<strong jscontent="name"></strong> <span jscontent="version"></span>
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</td>
<td class='number'>
<span class='th' jscontent="formatNumber(ws_priv)"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="formatNumber(ws_shared)"></span><span class='k'>k</span>
</td>
</tr>
</table>
<div class=otherbrowsers jsdisplay="show_other_browsers && browsers.length == 1">
Note: If other browsers (e.g. IE, Firefox, Safari) are running,
I'll show their memory details here.
</div>
<br /><br /><br />
<h2>
Processes
<div class='help'>
<div>
<p>
Details of memory usage for each of Chromium's processes.
</p>
</div>
</div>
</h2>
<table class='list' id='memoryDetails'>
<colgroup>
<col class='pid' />
<col class='name' />
<col class='number' />
<col class='number' />
</colgroup>
<tr class='firstRow doNotFilter'>
<th>
</th>
<th>
</th>
<th colspan='2'>
Memory
</th>
</tr>
<tr class='secondRow doNotFilter'>
<th class='pid'>
PID
</th>
<th class='name'>
Name
</th>
<th class='number'>
Private
</th>
<th class='number'>
Proportional
</th>
</tr>
<tr jsselect="browzr_data">
<td class='pid'>
<span class='th' jscontent="pid"></span>
</td>
<td class='name'>
<div>
Browser
</div>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_ws_priv', $this.ws_priv)" jscontent="formatNumber(ws_priv)"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="formatNumber(ws_shared)"></span><span class='k'>k</span>
</td>
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<td class='pid'>
<span class='th' jscontent="pid"></span>
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<td class='name'>
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<div jsselect="titles">
<span jscontent="$this"></span><br>
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<td class='number'>
<span class='th' jseval="addToSum('tot_ws_priv', $this.ws_priv)" jscontent="formatNumber(ws_priv)"></span><span class='k'>k</span>
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<td class='number'>
<span class='th' jscontent="formatNumber(ws_shared)"></span><span class='k'>k</span>
</td>
</tr>
<tr class='total doNotFilter'>
<td class='pid'>
</td>
<td class='name'>
Σ
</td>
<td class='number'>
<span class='th' id="tot_ws_priv">0</span><span class='k'>k</span>
</td>
<td class='number'>
</td>
</tr>
<tr class='noResults'>
<td colspan='99'>
No results found.
</td>
</tr>
</table>
<div class="otherbrowsers">(The memory usage of our renderer processes is slightly less accurate when they are sandboxed.)</div>
</div>
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